SGER - Hydrologic Monitoring of Leaking Coseismically Active Thrusts: A Pilot Study in the Nankai Subduction Zone

SGER - 同震活跃逆冲泄漏的水文监测：南开俯冲带的试点研究

• 批准号: 0628676
• 负责人: Kevin Brown
• 金额: $ 5.21万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-05-01 至 2007-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0628676&HistoricalAwards=false
• 关键词: SGER; Hydrologic; Monitoring; Leaking; Coseismically

AbstractUnder this award, the PIs will undertake a pilot study of the interaction of tectonics and hydrogeology at the Nankai accretionary wedge of Japan. The study entails the deployment of five instruments for one year monitoring of cold seeps along the major coseismically active out-of-sequence thrust (OOST) zones. The PIs have been invited on a 3-week Japanese cruise that will investigate the seeps and deploy the instruments. These thrusts link directly down to the seismogenic zone, are known to leak fluids, and numerous seeps have been identified along them. Recent observations indicate that this OOST region is also the location from which very low frequency (VLF) earthquakes appear to be originating that may be tied to ultra slow earthquakes near the updip limit of the seismogenic zone. The PIs will be using instrumentation that has been shown to be capable of collecting long-term records of fluid flow, temperature, and both aqueous and gas chemistry in active seep environments. By comparing these flow records to nearby borehole seismic records (and perhaps Japanese OBS records), The PIs hope to clarify the relationship between subsurface fluid pressure pulses and stress release eventsrelated to the VLF events.The broader impacts of this study come primarily through its direct relevance to major international programs of research and natural hazard mitigation. The field area is the focus of a significant portion of IODPs NantroSeize drilling program. It is also intended to help initiate a highly collaborative partnership between US, and Japanese scientists. Eventually, the instrumentation we will be using can be networked as part of a long-term monitoring system. Studying fault instabilities in an earthquake and tsunami generating subduction zone has direct human and political impact.

摘要该奖项将对日本的南卡（Nankai）增生性楔子进行构造与水文学相互作用进行试点研究。 这项研究需要在一年内部署五种仪器，以监测沿主要的coseismismistive sippitive sippition Onty pactive tosection Outsence Outsence推力（OOST）区域。 PI已被邀请参加为期3周的日本巡游，该巡航将调查渗漏并部署乐器。这些推力将直接链接到地震区，已知会泄漏流体，并且沿它们识别出许多渗水。最近的观察结果表明，这个OOST区域也是从地震区的更新限制附近的超慢地震束缚的位置。 PI将使用仪器，该仪器已被证明能够在活跃的渗水环境中收集流体流量，温度以及水性和气体化学的长期记录。通过将这些流记录与附近的井眼地震记录（也许还有日本的OBS记录）进行比较，PIS希望澄清地下流体压力脉冲和与VLF事件相关的压力释放事件之间的关系。这项研究的更广泛影响主要通过其直接来源。与主要的国际研究和缓解自然危害的计划有关。现场区域是iodps nantroseize钻探计划的重点。它还旨在帮助建立我们与日本科学家之间高度合作的合作伙伴关系。最终，我们将使用的仪器可以作为长期监控系统的一部分进行联网。研究地震和海啸产生俯冲带中的断层不稳定性具有直接的人类和政治影响。