Seismic Activity and Crustal Deformation after the 2011 Off the Pacific Coast of Tohoku Earthquake

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1 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 Agency

2 Earthquake research Institute, Univ. Tokyo World Seismicity Map 1952 Mw Mw9.1 Off the Pacific Coast of Tohoku Earthquake 2011 Mw Mw Mw Mw Mw9.5

3 Aftershock Area and Seismicity Triggered by the Mainshock Japan Meteorological Agency 3/12 3/11 4/11 3/23 3/12 4/7 3/11 3/9 3/15 3/11 3/11

4 Aftershock Activity during Two Years Japan Meteorological Agency M7.3 M7.3 M7.4 M7.5 M9.0 M7.2 M7.0 M7.6

5 Seismicity around the Aftershock Area during Two Years 2/ M6.3 Japan Meteorological Agency

6 Co-seismic Crustal Deformation (GEONET) T Nishimura et al., Earth Planets Space, 63, , 2011

7 New Technology for More Accurate Long-Term Forecast of Subduction-Zone Earthquakes GPS/Acoustic Seafloor Geodetic Observations Japan Coast Guard

8 Pre- and Co-seismic Crustal Displacements M. Sato, Japan Coast Guard

9 Steady Crustal Movements Caused by Subduction of Oceanic Plates (vs Eurasian plate) 40 N Japan Coast Guard Tohoku Univ. Nagoya Univ. 38 N 36 N 9.2cm/year (NUVEL-1A) 34 N Pacific Plate 32 N Approx. 4cm/year (Kotake et al.,1998) Philippine Sea Plate 5cm/year 134 E 136 E 138 E 140 E 142 E 144 E 146 E The velocity vectors detected by GPS/acoustic seafloor geodetic observations are generally consistent with those detected by on-land GPS measurements. M. Sato, Japan Coast Guard

10 Co-seismic Displacement off the Coast of Miyagi Prefecture Sato et al., Science, 19 May 2011

11 Co-seismic Fault Slip Model of GSI Estimated vertical displacement estimated from the model Geospatial Information Authority of Japan

12 Post-seismic Crustal Deformation (GEONET) Geospatial Information Authority of Japan

13 Post-seismic Fault Slip Model (GEONET) Geospatial Information Authority of Japan

14 Cumulative Seismic Moment Equivalent to Post-seismic Crustal Deformation Geospatial Information Authority of Japan March 12, 2001 January 12, 2013

15 Headquarters for Earthquake Research Promotion Director: Minister of Education, Culture, Sports, Science and Technology Ministry of Education, Culture, Sports, Science and technology (MEXT) Japan Meteorological Agency (JMA) Geographical Survey Institute (GSI) National Research Institute for Earth Science and Disaster Prevention (NIED) National Institute of Advanced Industrial Science and Technology (AIST) Japan Coast Guard Japan Agency for Marine-Earth Science and Technology (JAMSTEC) National institute of Information and Communications Technology (NICT) Universities National Research Institute of Fire and Disaster Policy Committee Earthquake Research Committee 1 Planning of comprehensive and basic policies 2 Coordination of budgets and other administrative works with related governmental organizations 3 Establishment of comprehensive survey and observation plans 4 Collection, arrangement, analysis and comprehensive evaluation of survey results by related governmental organizations, universities, etc. 5 Public announcements based on the comprehensive evaluations

16 National Seismic Hazard Maps for Japan Survey and Observation of Earthquakes Research of Active Faults Survey of Underground Structures The promotion of earthquake research-comprehensive and basic policy for the promotion of earthquake observations, surveys, measurements, and researches Long-term Evaluation of the Occurrence of Earthquakes Improvement of Methods to Evaluate( Predict) Strong Ground Motions Probabilistic Seismic Hazard Map The probability of ground motions equal to or higher than seismic intensity 6 Lower, occurring within 30 years from the present. Seismic Hazard Map for Specified Seismic Source Faults The seismic intensities forecast for various regions around the Miura-hanto fault group. These maps are expected to be used to raise the public's awareness of earthquake disaster reduction to take the earthquake disaster reduction measures more effectively and efficiently to evaluate the risks of establishing important facilities and enterprises in a certain area. Upper or above Seismic intensity Lower Upper Lower

17 National Tsunami Hazard Map Plan of HERP Earthquakes in Japan Sea Earthquakes along Japan Trench Earthquakes along Nankai Trough Earthquakes along Japan Trench Ministry of Education, Culture, Sports, Science and Technology (MEXT)

18 Distribution of Hi-net and F-net Seismic Stations Epio Epicenter of Main Shock HERP (MEXT)

19 Seafloor Cable Network Plan of MEXT Seismic Observations to improve earthquake early warning Pressure Measurements to monitor vertical movement of seafloor and improve tsunami warning Seismometers Pressure Gauges Plate subduction Ministry of Education, Culture, Sports, Science and Technology (MEXT)

20 Japan Meteorological Agency New Tsunami Warning System of JMA

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