Investigations of the Updip Limit of the Cascadia Seismogenic Zone

卡斯卡迪亚地震带上倾极限的调查

• 批准号: 0960879
• 负责人: Jeffrey McGuire
• 金额: $ 75万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-01 至 2016-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0960879&HistoricalAwards=false
• 关键词: Investigations; Updip; Limit; Cascadia; Seismogenic

Great subduction zone earthquakes, such as the Alaska earthquake in 1964) and tsunamis originate in seismogenic (earthquake generating) zones of subduction zones, where vast tracts of seafloor slide beneath adjacent continental margins. One such region is the Cascadia Subduction Zone, which extends from northernmost California to southern British Columbia, Canada. Great earthquakes occur along this margin at interval of several hundred years; the last was in 1700. Given the population density of the region today, the next is likely to cause considerable damage and loss of life. Learning a much as possible about seismogenic processes in Cascadia is clearly imperative. Much has been learned in recent years about how energy is stored and released in seismogenic zones. Among the most interesting phenomona are episodic tremor and slip (ETS) and very low frequency events (VLFE). These are not earthquakes; instead, the Earth groans, but these processes are not well understood. This deployment of ocean bottom seismometers is part of an international collaboration aimed at investigating these seismic processes. Aside from its obvious societal relevance, the broader impacts of this effort include the international collaboration and its contribution to upcoming broader Cascadia initiative.

俯冲带大地震（如1964年的阿拉斯加地震）和海啸起源于俯冲带的孕震（地震生成）区，在那里，大片的海底滑到相邻大陆边缘之下。卡斯卡迪亚俯冲带就是这样一个地区，它从最北端的加州延伸到加拿大的不列颠哥伦比亚省南部。大地震沿着这片边缘每隔几百年发生一次，最近一次发生在1700年。考虑到该地区目前的人口密度，下一次地震可能会造成相当大的破坏和生命损失。尽可能多地了解卡斯卡迪亚的地震孕育过程显然是必要的。近年来，人们对能量在孕震区是如何储存和释放的有了很多了解。其中最有趣的现象是幕式震颤和滑动（ETS）和甚低频事件（VLFE）。这些不是地震;相反，地球呻吟，但这些过程还没有得到很好的理解。海底地震仪的部署是旨在调查这些地震过程的国际合作的一部分。除了其明显的社会意义外，这一努力的更广泛影响包括国际合作及其对即将推出的更广泛的卡斯卡迪亚倡议的贡献。