Physical state of the subducting Juan de Fuca plate and the blind deconvolution problem in global seismology

俯冲胡安德富卡板块的物理状态与全球地震学中的盲反褶积问题

• 批准号: 138004-2011
• 负责人: Bostock, Michael
• 金额: $ 4.59万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=545463
• 关键词: Physical; state; subducting; Juan; de

Over the next five years my research program will focus on 2 key problems in global seismology, one that is observational and the other theoretical. The first project concerns the physical state of the subducting Juan de Fuca plate from northern Vancouver Island to northern California and its influence on earthquake occurrence. A number of different styles of earthquake, each with its own significance for seismic hazard to population centers, occur in this region. Megathrust earthquakes, comparable in magnitude to the Indonesian earthquake in December 2004, occur on average every 550 years. Deep slab earthquakes are smaller in magnitude but occur in closer vicinity to major population centers such as Vancouver and Victoria and so pose significant threat. The most damaging earthquakes to occur in southwestern B.C. in the past century have been crustal earthquakes on central Vancouver Island. A fourth class of earthquake that has only recently been discovered involves very slow slip deep on the plate boundary. Although not directly hazardous, there is growing evidence for associations between slow slip earthquakes and the other classes of earthquake through the structure of the subducting plate and the migration/transport of fluids that are generated therein. This research aims to clarify these associations.

在接下来的五年里，我的研究计划将集中在全球地震学中的两个关键问题上，一个是观测问题，另一个是理论问题。第一个项目涉及从温哥华岛北部到加利福尼亚州北部俯冲的胡安德富卡板块的物理状态及其对地震发生的影响。该地区发生了许多不同类型的地震，每一种地震对人口中心的地震危害都有其各自的意义。巨型逆冲地震的震级相当于2004年12月的印度尼西亚地震，平均每550年发生一次。深部板状地震震级较小，但发生在温哥华和维多利亚等主要人口中心附近，因此构成了重大威胁。在过去的一个世纪里，公元前西南部发生的最具破坏性的地震是温哥华中部的地壳地震。第四类地震是最近才发现的，涉及板块边界深处非常缓慢的滑动。尽管没有直接的危险，但越来越多的证据表明，通过俯冲板块的结构和在其中产生的流体的迁移/运输，慢滑地震与其他类型的地震之间存在联系。本研究旨在阐明这些联系。