Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka JAPAN
|
|
- Liliana McLaughlin
- 6 years ago
- Views:
Transcription
1 Dense Ocean floor Network System for Mega Thrust Earthquakes & Tsunamis(DONET) -Towards Understanding Mega Thrust Earthquakes, the Geohazard & Disaster Mitigation- Yoshiyuki KANEDA, Katsuyoshi KAWAGUCHI, Eiichiro ARAKI, Hiroyuki MATSUMOTO, Takeshi NAKAMURA, Shinichiro KAMIYA, Keisuke ARIYOSHI, Takane HORI Earthquake and Tsunami research project for Disaster Prevention Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka JAPAN Abstract: The Nankai Trough is well known as the mega thrust earthquake generating tsunamis, with the interval of years. To understand and elucidate the recurrences of the mega thrust earthquakes, ocean floor network systems for the real time monitoring of seismogenic zone are quite useful and important. We are developing the ocean floor network system (DONET), funded by Japanese government MEXT project. The data from DONET will be applied to the early warning earthquakes and tsunamis. Furthermore, the precise data of crustal activities from DONET will improve the recurrence cycle simulation model using data assimilations. 1. INTRODUCTION The Nankai Trough is well known as the mega thrust earthquake generating tsunamis, with the interval of years. There are three mega thrust earthquake seismogenic zones in the Nankai trough. Especially, the 1944 /1946 earthquakes in Showa Nankai trough earthquakes and the 1854 Ansei Nankai trough earthquakes, first ruptures were starting from the Tonankai seismogenic zone. However, according to Prof. Okamura of KOCHI University, super mega thrust earthquakes with large tsunamis such as the 1707 Hoei earthquake, the 1361 Shohei earthquake and the 684 Hakuho earthquakes are estimated to be occurring with intervals of years or 700 years by historical tsunami research. These facts are very severe problems for Japan. Based on recent structural researches, observational researches and advanced simulation researches, we recognize that the Tonankai seismogenic is very important area to understand the recurrence system of mega thrust earthquakes around the Nankai trough. Therefore, we have been starting to developing and deploying the dense ocean floor observatory network system around the Tonankai seismogenic zone to monitor crustal activities using broadband seismometer, accelerometer and precise pressure gauges. The probability of next Tonankai earthquake recurrence is estimate as 60-70%. So, to monitor the crustal activities for the early warning and improvement of recurrence cycle simulation of mega thrust earthquakes, the ocean floor network is significant and important. In this paper, we explain the recent and detailed developing of this Copyright 2010 SubOptic Page 1 of 6
2 ocean floor network system (DONET). Furthermore, the new project including observation simulation and mitigation researches of mega thrust earthquakes around the Nankai trough is starting as 5 years project ( ). Especially, the Ocean floor network data is very important and powerful to progress the new project. There are imaged key structures such as subducting seamount in the Nankai seismogenic zone, cyclic ridge subducting system in the Tokai seismogenic zone and splay faults and the irregular structure around the Tonankai seismogenic zone (Figure2). Moreover, results of mega thrust The Nankai trough is well known as mega thrust earthquake seismogenic zone. There are 3mega thrust rupture zones such as the Tokai, Tonankai and Nankai seismogenic zone (Figure1). In these rupture area, mega thrust earthquakes over M8 are occurring with a interval of years (Table1). earthquake recurrence cycle simulation show that the first ruptures are occurring around the Tonankai earthquake rupture zone in each recurrence cycle. In 1854, 1944/46, actually, first ruptures were starting from the Tonankai earthquake rupture zone ahead of the Nankai earthquake rupture zone with intervals of 32 hours in the 1854 Ansei earthquake and 2years in the Showa earthquakes. The result of recurrence cycle simulation indicates the difference patterns and intervals of mega-thrust earthquake recurrences in each cycle (Figure3). These results of simulation are consisted In seismogenic zone researches such as structural researches using seismic refractions and reflections, we have succeeded to image the key structures to understand recurrences of mega thrust earthquakes around the Nankai trough. with the past two earthquakes in 1854, Copyright 2010 SubOptic Page 2 of 6
3 1944/46 around the Nankai trough. The new research project for the evaluation of seismic linkage around the Nankai trough mega thrust earthquakes is starting as MEXT project which is as a kind of Japanese government funded project. Around the Nankai trough, especially, off Kii peninsula located around the Tonankai seismogenic zone, we are deploying the advanced ocean floor network system (DONET) and Chikyu drilling as IODP (Integrated Ocean Drilling Program) is carrying out. Then, the long term observatory system using the borehole by Chikyu drilling will be connected to DONET system. Finally, we will develop 3 dimensional real time monitoring system(figure4). 1. THE DENSE OCEAN FLOOR NETWORK for EARTHQUAKES and TSUNAMIS (DONET) The imaged irregular structure such as a key structure at the segment boundary between the Tonankai and Nankai earthquake rupture zone seems to be the controller of the Nankai Trough mega thrust seismogenic zone system (Figure2). And in each simulation cycles, the first ruptures are starting from the Tonankai earthquake rupture zone ahead of the Nankai earthquake rupture zone (Figure5). These results are consistent with the past two earthquakes in 1854, 1944/1946. (Table2) Therefore, for real time monitoring of the mega thrust seismogenic zone, DONET will be deployed around the Tonankai seismogenic zone to observe broad band phenomena (Figure6). According to previous researches, the Tonankai seismogenic zone is important to understand the system of Nankai trough mega thrust earthquake occurrences. Therefore, we have developed and been deploying the dense ocean floor observatory network system equipped with multi kinds of sensors such as seismometers, pressure gauges etc. around the Tonankai seismogenic zone (Figure7). Using DONET system, we can detect Copyright 2010 SubOptic Page 3 of 6
4 broad band phenomena such as strong motions, low frequency tremors and very low frequency earthquakes. Furthermore, precise multi pressure gauges will be most useful sensor to not only detect tsunamis This advanced dense ocean floor observatory network system has useful functions and purposes as follows, 1) Redundancy, Extension and advanced maintenance system using the looped cable system, junction boxes and the ROV/AUV, etc. (Figure8). 2) Multi kinds of sensors to observe broad band range phenomena such as long period tremors, low frequency earthquakes and strong motion of mega thrust earthquakes over M8.(Figure9) but also monitor ocean floor deformations with long term observations. These ocean floor deformation data will be applied to the data assimilation to improve recurrence cycle simulation model in the Nankai trough mega thrust earthquakes. DONET system will be the one of most advanced scientific tools to understand the mega thrust earthquakes around the Nankai trough. 3) Speedy evaluation and notification for earthquakes and tsunamis (Figure10). This function is most important for disaster reduction /mitigation. JMA is starting the early warning system, therefore, the ocean floor network data will Copyright 2010 SubOptic Page 4 of 6
5 contribute to this early warning system for disaster mitigation. Especially, for the tsunami early warning, DONET system is absolutely necessary and important. 4) Provide observed data such as ocean floor deformation derived from pressure gauges to improve the simulation and modeling researches about the mega thrust earthquakes These ocean floor deformation data are quit necessary for the data assimilation to improve simulation models (Figure11). DONET data will be applied to this new research project. 2. FUTURE PLAN We are developing DONET 2 with a high voltage power system (Figure13). We will deploy DONET2 around the Nankai seismogenic zone (Figure14). We have to apply the data from network to 4) Understanding of the interaction between the crust and upper mantle around subduction zone. 5) DONET data such as pressure gauges will be applied to current researches 6) New research project for the estimate of seismic linkage around the Nankai trough mega thrust earthquakes is starting from FY 2008 as 5 years project (Figure12). This project is entrusted by MEXT project which is as a kind of Japanese government funded project. understand the detailed crustal activities to improve simulation model, and to mitigate disaster damages. In the second step, we would like to develop and deploy the advanced ocean floor network as a regional system and integrate ocean and land observatory network data using advanced ocean floor observatory technologies. In the next step, we would like to collaborate with international network systems such as NEPTUNE(Canada/US), ESONET(Europe), MACHO(Taiwan) etc. to progress geosciences and contribute the Copyright 2010 SubOptic Page 5 of 6
6 early warning system for huge earthquakes and tsunamis (Figure15). In international collaborations, we will develop ocean floor network technologies and exchange data of geosciences to [5] T. Narumi, S. Kodaira, Y. Tatsumi, M.Yamashita, T. Sato, Y. Kaiho, S. Miura, T. No, K. Takizawa, Y. Kaneda, Structural variations of arc crusts and rifed margins in the southern Izu-Ogasawara arc-backarc system, Geochem. Geophys. Geosyst, vol. 10, Q09X08, doi: /2008gc [6] H. Matsumoto, M. Ohori, Y. Kaneda, Study on Use of Pressure Gauges in Near- Field for Tsunami Prediction, Journal of Coastal Engineering, JSCE, vol.56, p understand the global dynamics such as the global changes, environmental changes and natural disaster hazards and mitigations. Finally, we would like to enhance to the importance of practical database to improve structures and simulation using the data assimilation based on the ocean floor network data.. 4. REFERENCES [1] Y. Kaneda, M. Ohori, T. Nakamura, Newly Proposed Disaster Mitigation and Recovery for the Next Nankai Trough Megathrust Earthquakes, Journal of Disaster Research, vol.14 no.2,p , 2009 [2] Y. Kaneda, S. Kodaira, Structural Research on the Nankai Trough Using Reflections and Refractions, Journal of Disaster Research, vol4 no.2, p67-71, [3] Y. Kaneda, K. Hirahara, T. Furumura, New Research Project for Evaluating Seismic Linkage Around the Nankai Trough, Journal of Disaster Research, vol4 no.2, p61-66, 2009 [4] K.Ariyoshi,T.Hori, Jean-Pal Ampuero, Y.Kaneda,T.Matsuzawa,R.Hino,A. Hasegawa, Influence of interaction between small asperities on various types of slow earthquakes in a 3-D simulation for a subduction plate boundary, Gondwana Research, vol.16 no.3-4, p [7] Kodaira, S., T. Iidaka, A. Kato, J.-O. Park, T. Iwasaki and Y. Kaneda, High pore fluid pressure may cause silent slip in the Nankai Trough, Science, 304, , 2004 [8] Park, Jin-Oh, Tetsuro Tsuru, Shuichi Kodaira, P Phil R. Cummins, and Yoshiyuki Kaneda, Splay fault branching along the Nankai subduction zone, Science,Vol. 297, , [9] S.Kodaira, N.Takahashi, A.Nakanishi, S. Miura, Y.Kaneda, Subducted Seamount Imaged in the Rupture Zone of the 1946 Nankaido Earthquake, Science, ,2000 [10] Hori, T., Mechanisms of separation of rupture area and variation in time interval and size of great earthquakes along the Nankai Trough, southwest Japan, J. Earth Simulator, 5, 8-19, [11] Hori, T., N. Kato, K. Hirahara, T. Baba and Y. K Kaneda, A numerical simulation of earthquake cycles along the Nankai trough, southwest Japan: Lateral variation in frictional property due to the slab geometry controls the nucleation position, Earth Planet. Sci. Lett., 228, , Copyright 2010 SubOptic Page 6 of 6
Dense Ocean floor Network System for Earthquakes and Tsunamis DONET
Dense Ocean floor Network System for Earthquakes and Tsunamis DONET Yoshiyuki Kaneda Japan Agency for Marine-Earth Science and Technology (JAMSTEC) ION 1 Earthquakes in the Nankai Trough Tokai Nankai Hyuga
More informationReal time Monitoring System for Earthquakes and Tsunamis (DONET)
Real time Monitoring System for Earthquakes and Tsunamis (DONET) NankaiTrough Yoshiyuki Kaneda Japan Agency for Marine-Earth Science and Technology (JAMSTEC) POGO@Seoul Presentation 1 Earthquakes in the
More informationJAMSTEC Marine Geophysical Projects for Researches on Subduction Cycles and Deformation
JAMSTEC Marine Geophysical Projects for Researches on Subduction Cycles and Deformation Shuichi Kodaira Research Center for Earthquake and Tsunami JAMSTEC JAMSTEC Marine Geophysical Projects Motivation:
More informationReal Time Monitoring System for Megathrust Earthquakes and Tsunamis - Cabled Network System and Buoy System in Japan -
Real Time Monitoring System for Megathrust Earthquakes and Tsunamis - Cabled Network System and Buoy System in Japan - 1 Subduction zones around the world Haiti Italy Turkey Tohoku Sichuan Taiwan Sumatra
More informationElectrical Conductivity Structures around Seismically Locked Regions
Electrical Conductivity Structures around Seismically Locked Regions Tada-nori Goto Program for Deep Sea Research, IFREE, Japan Agency for Marine-Earth Science and Technology 1. Introduction Existence
More informationInversion Analysis of Historical Interplate Earthquakes Using Seismic Intensity Data
Inversion Analysis of Historical Interplate Earthquakes Using Seismic Intensity Data Katsuhisa Kanda and Masayuki Takemura Kobori Research Complex, Kajima Corporation, Tokyo 107-8502, Japan Summary An
More informationIntensive seismic activity around the Nankai trough revealed by DONET ocean-floor seismic observations
Earth Planets Space, 65, 5 15, 2013 Intensive seismic activity around the Nankai trough revealed by DONET ocean-floor seismic observations Masaru Nakano, Takeshi Nakamura, Shin ichiro Kamiya, Michihiro
More informationAmplification of Tsunami Heights by Delayed Rupture of Great Earthquakes along the Nankai Trough
Amplification of Tsunami Heights by Delayed Rupture of Great Earthquakes along the Nankai Trough Kentaro Imai 1,2, Kenji Satake 2 and Takashi Furumura 1,2 1 Center for Integrated Disaster Information Research,
More informationR/V Kairei Cruise Report KR Seismic study in the northwestern Pacific region. Jan. 4, 2011 Jan. 20, 2011
R/V Kairei Cruise Report KR11-01 Seismic study in the northwestern Pacific region Jan. 4, 2011 Jan. 20, 2011 Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Contents: 1.Cruise Information:
More informationSlip distributions of the 1944 Tonankai and 1946 Nankai earthquakes including the horizontal movement effect on tsunami generation
Slip distributions of the 1944 Tonankai and 1946 Nankai earthquakes including the horizontal movement effect on tsunami generation Toshitaka Baba Research Program for Plate Dynamics, Institute for Frontier
More informationSeismic Activity and Crustal Deformation after the 2011 Off the Pacific Coast of Tohoku Earthquake
J-RAPID Symposium March 6-7, 2013 Seismic Activity and Crustal Deformation after the 2011 Off the Pacific Coast of Tohoku Earthquake Y. Honkura Tokyo Institute of Technology Japan Science and Technology
More informationJapan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, , JAPAN
LARGE EARTHQUAKE AND ASSOCIATED PHENOMENA OBSERVED WITH SEAFLOOR CABLED OBSERVATORY NEAR EPICENTER - AN IMPLICATION FOR POSSIBLE ADDITIONAL MEASUREMENT WITH TELECOMMUNICATION NETWORKS FOR IDENTIFICATION
More informationA subducted oceanic ridge influencing the Nankai megathrust earthquake rupture
FRONTIER RESEARCH ON EARTH EVOLUTION, VOL. A subducted oceanic ridge influencing the Nankai megathrust earthquake rupture Jin-Oh Park Research Program for Plate Dynamics, Institute for Research on Earth
More informationSOURCE MODELING OF SUBDUCTION-ZONE EARTHQUAKES AND LONG-PERIOD GROUND MOTION VALIDATION IN THE TOKYO METROPOLITAN AREA
SOURCE MODELING OF SUBDUCTION-ZONE EARTHQUAKES AND LONG-PERIOD GROUND MOTION VALIDATION IN THE TOKYO METROPOLITAN AREA ABSTRACT : Hiroe Miyake 1, Kazuki Koketsu 2, and Takashi Furumura 3,2 1 Assistant
More informationSplay fault and megathrust earthquake slip in the Nankai Trough
Earth Planets Space, 53, 243 248, 2001 Splay fault and megathrust earthquake slip in the Nankai Trough Phil R. Cummins, Takane Hori, and Yoshiyuki Kaneda Frontier Research Program for Subduction Dynamics,
More informationUrgent aftershock observation of the 2004 off the Kii Peninsula earthquake using ocean bottom seismometers
LETTER Earth Planets Space, 57, 363 368, 2005 Urgent aftershock observation of the 2004 off the Kii Peninsula earthquake using ocean bottom seismometers Shin ichi Sakai 1, Tomoaki Yamada 1, Masanao Shinohara
More informationSource modeling of hypothetical Tokai-Tonankai-Nankai, Japan, earthquake and strong ground motion simulation using the empirical Green s functions
Source modeling of hypothetical Tokai-Tonankai-Nankai, Japan, earthquake and strong ground motion simulation using the empirical Green s functions Y. Ishii & K. Dan Ohsaki Research Institute, Inc., Tokyo
More informationSeismicity around the seaward updip limit of the Nankai Trough seismogenic zone revealed by repeated OBS observations
FRONTIER RESEARCH ON EARTH EVOLUTION, VOL. 1 Seismicity around the seaward updip limit of the Nankai Trough seismogenic zone revealed by repeated OBS observations Koichiro Obana 1, Shuichi Kodaira 1, Yoshiyuki
More informationDepth-dependent slip regime on the plate interface revealed from slow earthquake activities in the Nankai subduction zone
2010/10/11-14 Earthscope Workshop Depth-dependent slip regime on the plate interface revealed from slow earthquake activities in the Nankai subduction zone Kazushige Obara, ERI, Univ. Tokyo Recurrence
More informationThe Current Activities of the Headquarters for Earthquake Research Promotion Concerning Tonankai/Nankai Earthquakes
The Current Activities of the Headquarters for Earthquake Research Promotion Concerning Tonankai/Nankai Earthquakes ISOGAI Keisuke Director of Earthquake Research Division, Research and Development Bureau,
More informationI point out two possible paradoxical difficulties in the important target of the IODP in subduction zones, i.e.,
Drilling the Seismogenic Zone: Some Paradoxes Tetsuzo Seno Earthquake Research Institute, University of Tokyo (Bull. Earthq. Res. Inst., subumitted on January 16, 2003; accepted on July 22, 2003) Abstract
More informationR/V Kairei Cruise Report KR Seismic study in Nansei-Shoto Region. November 17, 2013 December 14, 2013
R/V Kairei Cruise Report KR13-18 Seismic study in Nansei-Shoto Region November 17, 2013 December 14, 2013 Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Contents: 1.Cruise Information:
More informationHigh resolution receiver function imaging of the seismic velocity discontinuities in the crust and the uppermost mantle beneath southwest Japan
LETTER Earth Planets Space, 55, 59 64, 2003 High resolution receiver function imaging of the seismic velocity discontinuities in the crust and the uppermost mantle beneath southwest Japan Makiko Yamauchi
More informationSubmarine Cabled Real-time Seafloor Observatory and Subsea Engineering ROV for Observatory Construction
Submarine Cabled Real-time Seafloor Observatory and Subsea Engineering ROV for Observatory Construction Katsuyoshi KAWAGUCHI, Sho Kaneko (Japan Agency for Marine-earth Science and Technology), Takato Nishida
More informationSeismic activity beneath the Nankai trough revealed by DONET ocean-bottom observations
Mar Geophys Res (214) 35:271 284 DOI 1.17/s111-13-9195-3 SPECIAL ISSUE PAPER Seismic activity beneath the Nankai trough revealed by DONET ocean-bottom observations Masaru Nakano Takeshi Nakamura Shin-ichiro
More informationREGIONAL CHARACTERISTICS OF STRESS FIELD AND ITS DYNAMICS IN AND AROUND THE NANKAI TROUGH, JAPAN
46 4 2003 7 CHINESE JOURNAL OF GEOPHYSICS Vol. 46, No. 4 July, 2003 1 1 2 3 1, 100037 2, 920-1192 3, 237-0061,,, : -. (10 22 ), (60 85km) ; (40 ), (160km)..,. GPS,, -,,.,,,.. 0001-5733(2003) 04-0488 -
More informationDisaster Prevention Research Section, Technology Center, Taisei Corporation, Yokohama, Japan 2
LONG-PERIOD GROUND MOTION SIMULATION OF 2004 OFF THE KII PENINSULA EARTHQUAKES AND PREDICTION OF FUTURE M8 CLASS EARTHQUAKES ALONG NANKAI TROUGH SUBDUCTION ZONE, SOUTH OF JAPAN ISLAND Chiaki Yoshimura
More informationGEOPHYSICAL RESEARCH LETTERS, VOL. 37, L09304, doi: /2010gl042935, 2010
Click Here for Full Article GEOPHYSICAL RESEARCH LETTERS, VOL. 37,, doi:10.1029/2010gl042935, 2010 Seismic characteristics around the fault segment boundary of historical great earthquakes along the Nankai
More informationLETTER Earth Planets Space, 57, , 2005
LETTER Earth Planets Space, 57, 1115 1120, 2005 A tectonic interpretation of NW-SE strike-slip faulting during the 2004 off the Kii peninsula earthquakes, Japan: Probable tear of the Philippine Sea plate
More informationS/V Yokosuka Cruise Report YK14-E02
S/V Yokosuka Cruise Report YK14-E02 2014FY Marine geological and geophysical surveys to unravel the subduction zone great earthquakes and tsunamis : Seismic refraction and reflection survey in the outer
More informationCoseismic slip distribution of the 1946 Nankai earthquake and aseismic slips caused by the earthquake
Earth Planets Space, 53, 235 241, 2001 Coseismic slip distribution of the 1946 Nankai earthquake and aseismic slips caused by the earthquake Yuichiro Tanioka 1 and Kenji Satake 2 1 Meteorological Research
More informationDeep Seismic Surveys in the Kinki District : Shingu- Maizuru Line
Bull. Earthq. Res. Inst. Univ. Tokyo Vol. 2+,**0 pp.,-3,./ Deep Seismic Surveys in the Kinki District : Shingu- Maizuru Line Kiyoshi Ito +, Yasuhiro Umeda +, Hiroshi Sato,, Issei Hirose +, Naoshi Hirata,,
More informationIntraoceanic thrusts in the Nankai Trough off the Kii Peninsula: Implications for intraplate earthquakes
Click Here for Full Article GEOPHYSICAL RESEARCH LETTERS, VOL. 36, L06303, doi:10.1029/2008gl036974, 2009 Intraoceanic thrusts in the Nankai Trough off the Kii Peninsula: Implications for intraplate earthquakes
More informationThe great earthquakes that have shaped Japan 日本に大きな影響を与えた地震
The great earthquakes that have shaped Japan 日本に大きな影響を与えた地震 Brian Kennett, Research School of Earth Sciences, ANU Takashi Furumura Earthquake Research Institute, University of Tokyo Japan tectonic plates
More informationToru Matsuzawa. Title/Affiliation. Specialized Field
Toru Matsuzawa Title/Affiliation Specialized Field Research Subject Professor/ Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University Earthquake-generating
More informationVerification of the asperity model using seismogenic fault materials Abstract
Verification of the asperity model using seismogenic fault materials Takehiro Hirose*, Wataru Tanikawa and Weiren Lin Kochi Institute for Core Sample Research/JAMSTEC, JAPAN * Corresponding author: hiroset@jamstec.go.jp
More informationHitoshi Hirose (1), and Kazuro Hirahara (2) Abstract. Introduction
Three dimensional simulation for the earthquake cycle at a subduction zone based on a rate- and state-dependent friction law: Insight into a finiteness and a variety of dip-slip earthquakes Hitoshi Hirose
More informationMECHANISM OF THE 2011 TOHOKU-OKI EARTHQUAKE: INSIGHT FROM SEISMIC TOMOGRAPHY
Proceedings of the International Symposium on Engineering Lessons Learned from the 2011 Great East Japan Earthquake, March 1-4, 2012, Tokyo, Japan MECHANISM OF THE 2011 TOHOKU-OKI EARTHQUAKE: INSIGHT FROM
More informationThe 2011 off the Pacific coast of Tohoku Earthquake related to a strong velocity gradient with the Pacific plate
LETTER Earth Planets Space, 63, 663 667, 2011 The 2011 off the Pacific coast of Tohoku Earthquake related to a strong velocity gradient with the Pacific plate Makoto Matsubara 1 and Kazushige Obara 2 1
More informationCrustal structure across the coseismic rupture zone of the 1944 Tonankai earthquake, the central Nankai Trough seismogenic zone
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 17, NO. B1, 7, 129/1JB424, 2 Crustal structure across the coseismic rupture zone of the 1944 Tonankai earthquake, the central Nankai Trough seismogenic zone Ayako
More informationStructural factors controlling the rupture process of a megathrust earthquake at the Nankai trough seismogenic zone
Geophys. J. Int. (2002) 149, 815 835 Structural factors controlling the rupture process of a megathrust earthquake at the Nankai trough seismogenic zone S. Kodaira, 1 E. Kurashimo, 2 J.-O. Park, 1 N. Takahashi,
More informationCruise report of KY11-06 Leg1
Cruise report of KY11-06 Leg1 Cruise : KY11-06 /Leg1 / R/V Kaiyo Research subject: Construction of Seafloor observation Network for Earthquakes and Tsunamis Research Proposal by: Yoshiyuki KANEDA/JAMSTEC
More informationA possible mechanism of M 9 earthquake generation cycles in the area of repeating M 7 8 earthquakes surrounded by aseismic sliding
LETTER Earth Planets Space, 63, 773 777, 2011 A possible mechanism of M 9 earthquake generation cycles in the area of repeating M 7 8 earthquakes surrounded by aseismic sliding Takane Hori 1 and Shin ichi
More informationA Technical Report on the Advanced Real-time Earth Monitoring Network in the Area (ARENA) Chapter 1: Preface. ver1.0. Contents
A Technical Report on the Advanced Real-time Earth Monitoring Network in the Area (ARENA) Chapter 1: Preface ver1.0 Contents 1.1Introduction 1.2Present state of scientific submarine cables in Japan 1.3Achievements
More informationLETTERS. Low-frequency earthquakes in Shikoku, Japan, and their relationship to episodic tremor and slip
Vol 442 13 July 2006 doi:10.1038/nature04931 Low-frequency earthquakes in Shikoku, Japan, and their relationship to episodic tremor and slip David R. Shelly 1, Gregory C. Beroza 1, Satoshi Ide 2 & Sho
More informationA possible scenario for earlier occurrence of the next Nankai earthquake due to triggering by an earthquake at Hyuga-nada, off southwest Japan
Hyodo et al. Earth, Planets and Space (2016) 68:6 DOI 10.1186/s40623-016-0384-6 FULL PAPER A possible scenario for earlier occurrence of the next Nankai earthquake due to triggering by an earthquake at
More informationResistivity image of the Philippine Sea Plate around the 1944 Tonankai earthquake zone deduced by Marine and Land MT surveys
LETTER Earth Planets Space, 57, 29 213, 25 Resistivity image of the Philippine Sea Plate around the 1944 Tonankai earthquake zone deduced by Marine and Land MT surveys Takafumi Kasaya 1, Tada-nori Goto
More informationAlong strike variations in short term slow slip events in the southwest Japan subduction zone
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 115,, doi:10.1029/2008jb006059, 2010 Along strike variations in short term slow slip events in the southwest Japan subduction zone Shutaro Sekine, 1,2 Hitoshi Hirose,
More informationTohoku University, Sendai , Japan 3 Seismological Laboratory, California Institute of Technology, Pasadena, California , USA
Earth Planets Space, 64, 693 702, 2012 Migration process of very low-frequency events based on a chain-reaction model and its application to the detection of preseismic slip for megathrust earthquakes
More informationModeling short and long term slow slip events in the seismic cycles of large subduction earthquakes
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 115,, doi:10.1029/2010jb007566, 2010 Modeling short and long term slow slip events in the seismic cycles of large subduction earthquakes Takanori Matsuzawa, 1 Hitoshi
More informationStrong Ground Motion Evaluation in the Tokyo Metropolitan Area: The 1923 Kanto Earthquake and Future Subduction-Zone Earthquakes
Strong Ground Motion Evaluation in the Tokyo Metropolitan Area: The 1923 Kanto Earthquake and Future Subduction-Zone Earthquakes Kazuki Koketsu 1) and Hiroe Miyake 2) 1) Earthquake Research Institute,
More informationCrustal deformation by the Southeast-off Kii Peninsula Earthquake
Crustal deformation by the Southeast-off Kii Peninsula Earthquake 51 Crustal deformation by the Southeast-off Kii Peninsula Earthquake Tetsuro IMAKIIRE, Shinzaburo OZAWA, Hiroshi YARAI, Takuya NISHIMURA
More informationLong-period ground motion simulation in the Kinki area during the MJ 7.1 foreshock of the 2004 off the Kii peninsula earthquakes
LETTER Earth Planets Space, 57, 197 202, 2005 Long-period ground motion simulation in the Kinki area during the MJ 7.1 foreshock of the 2004 off the Kii peninsula earthquakes Nobuyuki Yamada and Tomotaka
More informationStudy megathrust creep to understand megathrust earthquakes
1 Study megathrust creep to understand megathrust earthquakes Kelin Wang Pacific Geoscience Centre, Geological Survey of Canada, kelin.wang@canada.ca Introduction Once upon a time, there was a belief that
More informationHistorical Maximum Seismic Intensity Maps in Japan from 1586 to 2004: Construction of Database and Application. Masatoshi MIYAZAWA* and Jim MORI
Annuals of Disas. Prev. Res. Inst., Kyoto Univ., No. 4C, 25 Historical Maximum Seismic Intensity Maps in Japan from 6 to 24: Construction of Database and Application Masatoshi MIYAZAWA* and Jim MORI *
More informationStudy on the effect of the oceanic water layer on strong ground motion simulations
Earth Planets Space, 62, 621 630, 2010 Study on the effect of the oceanic water layer on strong ground motion simulations Anatoly Petukhin 1, Tomotaka Iwata 2, and Takao Kagawa 3 1 Geo-Research Institute,
More informationNew Seismic Activity Model of Large Earthquakes along Nankai Trough for Probabilistic Seismic Hazard Maps
New Seismic Activity Model of Large Earthquakes along Nankai Trough for Probabilistic Seismic Hazard Maps Toshihiko Okumura (Shimizu Corp.) Hiroyuki Fujiwara (NIED) Plate Tectonics around Japan Pacific
More informationLong-term Crustal Deformation in and around Japan, Simulated by a 3-D Plate Subduction Model
Long-term Crustal Deformation in and around Japan, Simulated by a 3-D Plate Subduction Model Chihiro Hashimoto (1) and Mitsuhiro Matsu ura (2) (1) Institute of Frontier Research for Earth Evolution, Japan
More informationGEOPHYSICAL RESEARCH LETTERS, VOL. 39, L00G24, doi: /2011gl050399, 2012
GEOPHYSICAL RESEARCH LETTERS, VOL. 39,, doi:10.1029/2011gl050399, 2012 Normal-faulting earthquakes beneath the outer slope of the Japan Trench after the 2011 Tohoku earthquake: Implications for the stress
More informationAnnual Report for Research Work in the fiscal year 2006
JST Basic Research Programs C R E S T (Core Research for Evolutional Science and Technology) Annual Report for Research Work in the fiscal year 2006 Research Area : High Performance Computing for Multi-scale
More informationStructural heterogeneity in the megathrust zone and mechanism of the 2011 Tohoku oki earthquake (Mw 9.0)
GEOPHYSICAL RESEARCH LETTERS, VOL. 38,, doi:10.1029/2011gl048408, 2011 Structural heterogeneity in the megathrust zone and mechanism of the 2011 Tohoku oki earthquake (Mw 9.0) Dapeng Zhao, 1 Zhouchuan
More informationPure and Applied Geophysics. TAKASHI FURUMURA, 1 TOSHIHIKO HAYAKAWA, 1 MISAO NAKAMURA, 2 KAZUKI KOKETSU, 1 and TOSHITAKA BABA 3. 1.
Pure appl. geophys. jj (2008) 1 23 Ó Birkhäuser Verlag, Basel, 2008 DOI 10.1007/s00024-008-0318-8 Pure and Applied Geophysics Development of Long-period Ground Motions from the Nankai Trough, Japan, Earthquakes:
More informationACTIVITIES OF THE HEADQUARTERS FOR EARTHQUAKE RESEARCH PROMOTION
Journal of Japan Association for Earthquake Engineering, Vol.4, No.3 (Special Issue), 2004 ACTIVITIES OF THE HEADQUARTERS FOR EARTHQUAKE RESEARCH PROMOTION Sadanori HIGASHI 1 1 Member of JAEE, Earthquake
More informationNumerical simulation of seismic cycles at a subduction zone with a laboratory-derived friction law
Numerical simulation of seismic cycles at a subduction zone with a laboratory-derived friction law Naoyuki Kato (1), Kazuro Hirahara (2) and Mikio Iizuka (3) (1) Earthquake Research Institute, University
More informationScaling of characterized slip models for plate-boundary earthquakes
LETTER Earth Planets Space, 6, 987 991, 28 Scaling of characterized slip models for plate-boundary earthquakes Satoko Murotani, Hiroe Miyake, and Kazuki Koketsu Earthquake Research Institute, University
More informationGeometry of slab, intraslab stress field and its tectonic implication in the Nankai trough, Japan
Earth Planets Space, 54, 733 742, 2002 Geometry of slab, intraslab stress field and its tectonic implication in the Nankai trough, Japan Jiren Xu 1 and Yoshiteru Kono 2 1 Deep Sea Research Department,
More informationTsuneji Rikitake. Earth Planets Space, 51, , 1999
Earth Planets Space, 51, 147 157, 1999 Probability of a great earthquake to recur in the Tokai district, Japan: reevaluation based on newly-developed paleoseismology, plate tectonics, tsunami study, micro-seismicity
More informationLong-period Ground Motion Characteristics of the Osaka Sedimentary Basin during the 2011 Great Tohoku Earthquake
Long-period Ground Motion Characteristics of the Osaka Sedimentary Basin during the 2011 Great Tohoku Earthquake K. Sato, K. Asano & T. Iwata Disaster Prevention Research Institute, Kyoto University, Japan
More informationDouble-difference relocations of the 2004 off the Kii peninsula earthquakes
LETTER Earth Planets Space, 57, 357 362, 25 Double-difference relocations of the 24 off the Kii peninsula earthquakes Bogdan Enescu 1, James Mori 1, and Shiro Ohmi 1 1 Disaster Prevention Research Institute
More informationAn Examination of Accretionary Prisms at the Nobeoka Thrust
Evan Tam, University of Connecticut UTRIP 2012 Participant, Kimura Labs An Examination of Accretionary Prisms at the Nobeoka Thrust Introduction Accretionary prisms form at convergent plate boundaries,
More informationThe Mechanics of Earthquakes and Faulting
The Mechanics of Earthquakes and Faulting Christopher H. Scholz Lamont-Doherty Geological Observatory and Department of Earth and Environmental Sciences, Columbia University 2nd edition CAMBRIDGE UNIVERSITY
More informationJMA Tsunami Warning Services. Takeshi KOIZUMI Senior Coordinator for International Earthquake and Tsunami Information Japan Meteorological Agency
JMA Tsunami Warning Services Takeshi KOIZUMI Senior Coordinator for International Earthquake and Tsunami Information Japan Meteorological Agency Tectonic Setting of Japan (Headquarters for Earthquake Research
More informationDrilling into the Memory of the Earth An Introduction to International Ocean Discovery Program
Drilling into the Memory of the Earth An Introduction to International Ocean Discovery Program Y. Tatsumi (Dept. Earth & Planetary Sciences) Why is this planet to be the Earth? This is a fundamental question
More informationCruise report of R/V Kaiyo KY10-07 cruise. "Installation of Earthquake and Tsunami monitoring system"
Cruise report of R/V Kaiyo KY10-07 cruise. "Installation of Earthquake and Tsunami monitoring system" Kumano-nada, off Shiono-misaki, the Nankai Trough Earthquake and Tsunami research project for Disaster
More informationoverlie the seismogenic zone offshore Costa Rica, making the margin particularly well suited for combined land and ocean geophysical studies (Figure
Chapter 1 Introduction Historically, highly destructive large magnitude (M w >7.0) underthrusting earthquakes nucleate along the shallow segment of subduction zone megathrust fault, and this region of
More informationG 3. AN ELECTRONIC JOURNAL OF THE EARTH SCIENCES Published by AGU and the Geochemical Society
Geosystems G 3 AN ELECTRONIC JOURNAL OF THE EARTH SCIENCES Published by AGU and the Geochemical Society Article Volume 10, Number 9 1 September 2009 Q09X08, doi:10.1029/2008gc002146 ISSN: 1525-2027 Structural
More informationMigration process of very low-frequency events based on a chain-reaction model
Migration process of very low-frequency events based on a chain-reaction model and its application to the detection of preseismic slip for megathrust earthquakes Keisuke Ariyoshi* 1, Toru Matsuzawa, Jean-Paul
More informationGROUND MOTION SPECTRAL INTENSITY PREDICTION WITH STOCHASTIC GREEN S FUNCTION METHOD FOR HYPOTHETICAL GREAT EARTHQUAKES ALONG THE NANKAI TROUGH, JAPAN
GROUND MOTION SPECTRAL INTENSITY PREDICTION WITH STOCHASTIC GREEN S FUNCTION METHOD FOR HYPOTHETICAL GREAT EARTHQUAKES ALONG THE NANKAI TROUGH, JAPAN Masayuki YOSHIMI 1, Yasuto KUWAHARA 2, Masayuki YAMADA
More informationGEOPHYSICAL RESEARCH LETTERS, VOL. 33, L18309, doi: /2006gl027025, 2006
Click Here for Full Article GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L18309, doi:10.1029/2006gl027025, 2006 Modern and ancient seismogenic out-of-sequence thrusts in the Nankai accretionary prism: Comparison
More informationStrong ground motions from the 2011 off-the Pacific-Coast-of-Tohoku, Japan (Mw=9.0) earthquake obtained from a dense nationwide seismic network
Landslides (2011) 8:333 338 DOI 10.1007/s10346-011-0279-3 Received: 10 June 2011 Accepted: 5 July 2011 Published online: 23 July 2011 The Author(s) 2011. This article is published with open access at Springerlink.com
More informationAnnouncements. Manganese nodule distribution
Announcements Lithospheric plates not as brittle as previously thought ESCI 322 Meet in Env. Studies Bldg Rm 60 at 1 PM on Tuesday One week (Thursday): Quiz on Booth 1994 and discussion. (Lots of odd terms
More informationSeismic structure of western end of the Nankai trough seismogenic zone
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 107, NO. B10, 2212, doi:10.1029/2000jb000121, 2002 Seismic structure of western end of the Nankai trough seismogenic zone Narumi Takahashi, Shuichi Kodaira, Ayako
More informationTsunami source of the 2004 off the Kii Peninsula earthquakes inferred from offshore tsunami and coastal tide gauges
LETTER Earth Planets Space, 57, 173 178, 2005 Tsunami source of the 2004 off the Kii Peninsula earthquakes inferred from offshore tsunami and coastal tide gauges Kenji Satake 1, Toshitaka Baba 2, Kenji
More informationThe Japanese University Joint Seismic Observations at the Niigaka-Kobe Tectonic Zone
Bull. Earthq. Res. Inst. Univ. Tokyo Vol. 2*,**/ pp. +-- +.1 * The Japanese University Joint Seismic Observations at the Niigaka-Kobe Tectonic Zone The Japanese University Group of the Joint Seismic Observations
More informationWhite paper for Geohazard (Submarine landslides and mass movements) at INVEST09 from Japanese research group
White paper for Geohazard (Submarine landslides and mass movements) at INVEST09 from Japanese research group A submarine landslide team of The Japanese planning group for Geohazard science at IODP* *Kiichiro
More informationThe University of Tokyo
The University of Tokyo Our ultimate mission is to study earthquake phenomenon scientifically, and to find out the ways to prevent or mitigate the disasters caused directly/indirectly by earthquakes. Slow
More informationMulti index method using offshore ocean bottom pressure data for real time tsunami forecast
Yamamoto et al. Earth, Planets and Space (26) 68:28 DOI.86/s4623-6-5-7 FULL PAPER Open Access Multi index method using offshore ocean bottom pressure data for real time tsunami forecast Naotaka Yamamoto
More informationAftershocks of the December 7, 2012 intraplate doublet near the Japan Trench axis
Obana et al. Earth, Planets and Space 20, 66:24 FULL PAPER OpenAccess Aftershocks of the December 7, 20 intraplate doublet near the Japan Trench axis Koichiro Obana 1,2*, Shuichi Kodaira 1,2, Yasuyuki
More informationSubduction zones 3 arc magmatism
5. 3 Subduction zones 3 arc magmatism Where can we observe magmatic/volcanic activities along subduction zones? Characteristics of arc magmatism (vs. mid-ocean ridge/intraplate magmatism) Structure of
More information9th Workshop on Three-Dimensional Modelling of Seismic Waves Generation, Propagation and their Inversion
1965-36 9th Workshop on Three-Dimensional Modelling of Seismic Waves Generation, Propagation and their Inversion 22 September - 4 October, 2008 Tomography and Active Tectonics in Kanto, Japan Francis T.
More informationOccurrence of quasi-periodic slow-slip off the east coast of the Boso peninsula, Central Japan
LETTER Earth Planets Space, 9, 11 1, Occurrence of quasi-periodic slow-slip off the east coast of the Boso peninsula, Central Japan Shinzaburo Ozawa, Hisashi Suito, and Mikio Tobita Geographical Survey
More information(Somerville, et al., 1999) 2 (, 2001) Das and Kostrov (1986) (2002) Das and Kostrov (1986) (Fukushima and Tanaka, 1990) (, 1999) (2002) ( ) (1995
( ) 1995 ( ) (Somerville, et al., 1999) 2 (, 2001) (2001) Das and Kostrov (1986) (2002) Das and Kostrov (1986) GPS ) (Fukushima and Tanaka, 1990) (, 1999) (2002) ( ) (1995 1 (outer fault parameter) (inner
More informationOriginally published as:
Originally published as: Henstock, T., McNeill, L., Dean, S., Barton, P., Tilmann, F., Rietbrock, A., Robinson, D., Gulick, S., Austin, J., Djajadihardja, Y., Natawidjaja, D., Permana, H., Bonneville,
More informationCapability of Tokai strainmeter network to detect and locate a slow slip
Article Capability of Tokai strainmeter network to detect and locate a slow slip K. Z. Nanjo 1,2,3, * 1 Global Center for Asian and Regional Research, University of Shizuoka, 3 6 1, Takajo, Aoi Ku, Shizuoka,
More informationComplicated repeating earthquakes on the convergent plate boundary: Rupture processes of the 1978 and 2005 Miyagi-ken Oki earthquakes
Complicated repeating earthquakes on the convergent plate boundary: Rupture processes of the 1978 and 2005 Miyagi-ken Oki earthquakes Changjiang Wu 1 and Kazuki Koketsu Earthquake Research Institute, University
More informationSeismic study in the Sagami Bay (Multichannel seismic reflection survey)
KR10-01 Cruise Report Seismic study in the Sagami Bay (Multichannel seismic reflection survey) Jan. 4, 2010 Jan. 8, 2010 Japan Agency for Marine-Earth Science and Technology (JAMSTEC) -1 - Contents: 1.
More informationNEW COMPACT OCEAN BOTTOM CABLED SYSTEM FOR SEISMIC AND TSUNAMI OBSERVATION
NEW COMPACT OCEAN BOTTOM CABLED SYSTEM FOR SEISMIC AND TSUNAMI OBSERVATION Toshihiko Kanazawa, Masanao Shinohara, Shin'ichi Sakai, Osamu Sano, Hisashi Utada, Hajime Shiobara, Yuichi Morita, Tomoaki Yamada
More informationTsunami waveform inversion including dispersive waves: the 2004 earthquake off Kii Peninsula, Japan
Click Here for Full Article JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 115,, doi:10.1029/2009jb006884, 2010 Tsunami waveform inversion including dispersive waves: the 2004 earthquake off Kii Peninsula, Japan
More informationWhat is an Earthquake?
Earthquakes What is an Earthquake? Earthquake - sometimes violent shaking of ground caused by movement of Earth s tectonic plates; creates seismic waves Often followed by smaller earthquakes (aftershocks);
More informationGroundwater changes related to the 2011 Off the Pacific Coast of Tohoku Earthquake (M9.0)
Groundwater changes related to the 2011 Off the Pacific Coast of Tohoku Earthquake (M9.0) Yuichi Kitagawa Senior Research Scientist, AIST, GSJ, Active Fault and Earthquake Research Cente Naoji Koizumi
More information