Ship-based Trackline Geophysical Data (MGD77) from the Nankai Trough Subduction Zone acquired during the Maurice Ewing expedition EW9907 (1999)

This data set was acquired with a ship-based Atlas Hydrosweep DS Multibeam Sonar system and BellAerospace BGM-3 Gravimeter during Maurice Ewing expedition EW9907 conducted in 1999 (Chief Scientist: Dr. Nathan Bangs). These data files are of MGD77 format and include Gravity Field and Singlebeam Bathymetry data and were processed after data collection. Data were acquired as part of the project(s): A 3-D Seismic Investigation of the Aseismic to Seismic Transition along the Eurasian-Phillippine Sea Plate Boundary: U.S.-Japan Cooperative Program, Seismic Velocity, Compaction, and Pore Pressure in Underthrust Sediments, Nankai Subduction Zone, and A 3-D Seismic Investigation of the Sediment-to-Rock Transition and Its Relationship to Nankai Subduction Thrust Seismicity: U.S.-Ja\r pan Collaborative Program, and funding was provided by NSF grant(s): OCE02-41375, OCE02-41380, OCE02-41482, OCE97-30637, OCE98-02264, and OCE98-02295.本数据集由船载Atlas Hydrosweep DS多波束声呐系统（Atlas Hydrosweep DS）与BellAerospace BGM-3重力仪（BellAerospace BGM-3），于1999年开展的Maurice Ewing航次EW9907期间采集，本次航次的首席科学家为Nathan Bangs博士。本数据集的文件格式为MGD77，包含重力场数据与单波束测深数据，且已在数据采集完成后完成预处理。本次数据采集依托以下科研项目：沿欧亚-菲律宾海板块边界无震至地震转换带的三维地震勘探：美日合作计划、南科俯冲带逆冲沉积物中的地震速度、压实作用与孔隙压力研究，以及沉积物-岩石转换带三维地震勘探及其与南科俯冲逆冲地震活动性的关系：美日合作计划。本研究获得美国国家科学基金会（National Science Foundation, NSF）的以下项目资助：OCE02-41375、OCE02-41380、OCE02-41482、OCE97-30637、OCE98-02264以及OCE98-02295。