Collaborative Research: A 3-D Seismic Investigation of the Nankai Trough Plate Boundary System in the Kumano Basin

合作研究：熊野盆地南海海槽板块边界系统的 3-D 地震调查

• 批准号: 0452340
• 负责人: Nathan Bangs
• 金额: $ 49.64万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-11-15 至 2010-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0452340&HistoricalAwards=false
• 关键词: Collaborative; Research; Seismic; Investigation; Nankai

AbstractThe PI team will acquire, process, and interpret a high-quality 3-D seismic reflection data volume in the Kumano Basin region south of Kii Peninsula, Japan. The 3D seismic survey will be carried out in April 2006 by PGS ship R/V Ramform Victory (Norwegian registry), jointly supported by the NSF and JAMSTEC. These data will define the fundamental geometry, history and physical properties of the multiple faults that compose the up-dip end of the seismogenic zone, many of which ruptured in the 1944 M 8.1 Tonankai earthquake. The proposed work is a major component of the integrated Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE), including the recently highly ranked shallow non-riser drilling and the deep riser drilling planned through the Integrated Ocean Drilling Program (IODP). With ground-truth from drilling and associated borehole geophysical experiments, this 3D seismic volume will provide unprecedented illumination of a plate boundary fault system to visualize its geometry, history, and associated rock properties, as it evolves down dip into a seismogenic zone. Furthermore, 3D imaging and seismic attribute mapping are essential components for refining drill site locations and for detailed planning for drilling and casing operations in support of the most ambitious scientific ocean drilling operation ever conceived. This project is a collaborative effort among four U.S. and two Japanese institutions to contract a seismic company to collect and provide preliminary processing of an ~20x80 km 3-D seismic reflection grid, along a transect from the Kumano Basin to the frontal thrust of the Nankai accretionary prism. The study encompasses a number of broader impacts, including the societal benefit of better understanding the origin of dangerous subduction zone thrust earthquakes.

PI小组将在日本纪伊半岛南部的熊野盆地地区采集、处理和解释高质量的三维地震反射数据。三维地震勘探将于2006年4月由PGS船R/V Ramform Victory（挪威注册）进行，由NSF和JAMSTEC联合支助。这些数据将确定构成孕震区上倾端的多个断层的基本几何形状、历史和物理性质，其中许多断层在1944年8.1级托南凯地震中破裂。拟议的工作是综合南海海槽地震带实验（NantroSEIZE）的主要组成部分，包括最近排名很高的浅层无立管钻井和通过综合大洋钻井计划（IODP）计划的深层立管钻井。通过钻井和相关钻孔地球物理实验的地面实况，该3D地震体将提供板块边界断层系统的前所未有的照明，以可视化其几何形状，历史和相关岩石特性，因为它向下倾斜演变成孕震区。此外，3D成像和地震属性绘图是完善钻井地点位置和详细规划钻井和套管作业的重要组成部分，以支持有史以来最雄心勃勃的科学海洋钻井作业。该项目是美国四个机构和日本两个机构之间的一项合作努力，与一家地震公司签订合同，收集并提供一个~ 20 × 80 km三维地震反射网格的初步处理，该网格沿着一个从熊野盆地到南开增生棱柱体前缘冲断层的断面。这项研究包括一些更广泛的影响，包括更好地了解危险的俯冲带逆冲地震的起源的社会效益。