R/V Marcus G. Langseth. Office of Marine Operations Lamont-Doherty Earth Observatory. MGL0902 Data Report PRELIMINARY
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1 R/V Marcus G. Langseth Office of Marine Operations Lamont-Doherty Earth Observatory MGL0902 Data Report PRELIMINARY Nuku alofa, Tonga - Nuku alofa, Tonga PI: Del Bohnensteihl Prepared by: AnthonyJohnson v. 1.0 January 20, 2009
2 Contents 1 Background and Scientific Objectives 2 2 Personnel Science Party Shipboard Technical Staff Marine Crew Instrumentation Instrumentation Overview Instrumentation Detail Seismic Summary 5 5 Client Instrumentation 6 6 Gravity Ties 7 7 Archive Contents 8 1
3 1 BACKGROUND AND SCIENTIFIC OBJECTIVES 1 Background and Scientific Objectives The objective of this cruise was to deploy a set of sound-channel-moored hydrophones stations along the East Lau Spreading Center (ELSC), where they will remain for a period of 18 months. The experiment is designed to overlap spatially and temporally with a scheduled 10-month deployment of broadband ocean bottom seismometers (OBSs) beginning in Nov and an active source seismic experiment scheduled for Jan/Feb Although these seismic projects are aimed at studying mantle processes, the extensive seismic network also can be used to provide constraints on the locations, depths and focal mechanisms of shallow hypocenter events within the Lau Basin. The deployment of an autonomous underwater hydrophone (AUH) network will create a rare opportunity to compare the results obtained using both technologies and develop new methods for jointly analyzing these seismic and hydroacoustic datasets. Since T-wave location accuracy and signal characteristics may depend on seafloor depth, morphology, and faulting style, the morphologic and tectonic diversity within the Lau back-arc system provides an ideal and unique environment for our experiment. The lessons learned from this joint deployment have the potential to significantly impact the interpretation and processing of future hydroacoustic datasets, enhancing our ability to extract quantitative information regarding earthquake source parameters and processes. The record of seismic activity provided by the AUH-OBS and AUH-only observations will be used to constrain the tectonics of the region, monitor and characterize episodes of submarine volcanism and identify earthquake activity that may impact ELSC hydrothermal sites, which are the focus of a long-term, interdisciplinary monitoring effort. 2
4 2 PERSONNEL 2 Personnel 2.1 Science Party Bohnenstiehl, Del Matsumoto, Haru Shanley, John Monigle, Patrick Bowman, Jeff Chief Sci, NCSU Co-Chief Sci, OSU Mooring Tech, NOAA Graduate student, NCSU Graduate, NCSU 2.2 Shipboard Technical Staff Johnson, Anthony Tech-in-Charge ajohnson@ldeo.columbia.edu Koczynski, Ted Technician tedski@ldeo.columbia.edu McKiernan, Bern Technician bmckiern@ldeo.columbia.edu Martinson, David Technician dmartins@ldeo.columbia.edu Spoto, Tom Chief Sound Source spoto@ldeo.columbia.edu Gutierrez, Carlos Sound Source Goodick, Brian Sound Source 2.3 Marine Crew OLoughlin,James Zeigler,Stanley Wolford,David Crum,Breckenridge Woronowicz,Jason Cereno,George Baxter,Gordon Redito,Ricardo Maea,Viliami Applewhite,Nicky Karlyn,Albert Chizmar,Peter Reed,Joshua Vetting,Ryan Billings,Jack Billips,Charles Uribe,Guillermo Brodock,Gary Rios,Ricardo Captain Chief Mate 2nd Mate 3rd Mate AB AB AB AB OS OS Chief Engineer 1st Engineer 2nd Engineer 3rd Engineer Oiler Oiler Oiler Steward Cook 3
5 3 INSTRUMENTATION 3 Instrumentation All science instruments aboard the Langseth are listed in the science sensors spreadsheet in the docs section of the cruise archive. Summary notes on operation during this cruise are listed below. Seismic equipment is not listed here, refer to Part IV for the seismic summary. Other instruments not listed were not in operation. For details on the data formats and interpretation notes, see Appendix A, Data Formats, included on the cruise archive. 3.1 Instrumentation Overview Instrument Description Data Set Data Output Files Interval CNAV C-Nav DGPS full nmea MGL-cnav.* 1s CNAV Furuno FE700 Echosounder none nmea MGL-bath01.* 1s EM122 EM122 center beam depth full nmea MGL-bath02 1s EM122 EM122 depth to spectra full nmea MGL-dbt02.* variable GYRO G full nmea MGL-gy01.* 1s KNUDSEN Knudsen 320B/R Echosounder partial segy See below variable MAGGIE Geometrics 882 Magnetometer n/a nmea MGL-mag01.* 1s PCO2 Lamont PCO2 System full ascii MGL-pco2.* variable POSMV Applanix POS/MV Integrated Nav System full nmea MGL-posmv.* 1s SEAPATH Applanix POS/MV Integrated Nav System full nmea MGL-seapath.* 1s DS50 Furuno DS50 Speedlog full nmea MGL-slog01.* 1s SPECTRA Spectra Seismic Nav System header log n/a ascii MGL-slog01.* variable TAGGER TM-4 Event Logger n/a ascii MGL-tagger01.* variable TSG Seabird SBE23 Thermosalinograph full ascii MGL-tsgraw.* 6s TSG SBE23 converted output full ascii MGL-tsg.* 6s GRAV Bell Aerospace BGM-3 Gravimeter full ascii MGL-vc01.* 1s WEATHER RMYoung Met System full ascii MGL-wx01.* 1s WEATHER Weather output to DP system partial nmea MGL-mwv01.* 1s XBT Sippican MK21 XBT probes 8 drops binary, ascii see below variable All timestamps in this report are presented using UTC time and day of year in order to avoid confusion with local time changes. 3.2 Instrumentation Detail Instrument Detail not available at time of writing. 4
6 4 SEISMIC SUMMARY 4 Seismic Summary No seismic operations were conducted during this cruise. 5
7 5 CLIENT INSTRUMENTATION 5 Client Instrumentation Nine moorings were deployed during this cruise. Refer to the cruise archive document MGL0902/docs/Lau09HydrophoneLocations.doc for mooring information. 6
8 6 GRAVITY TIES 6 Gravity Ties Gravity tie information not available at time of writing. 7
9 7 ARCHIVE CONTENTS 7 Archive Contents Not available at time of writing. 8
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