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

在未来5年，我的研究计划将集中在全球地震学的两个关键问题上，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到加利福尼亚的胡安·德·富卡板块俯冲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，每种地震对地震危险性都有自己的意义。与2004年12月印度尼西亚地震的震级相当的大型逆冲地震平均每550年发生一次。深板块地震虽然震级较小，但发生在温哥华和维多利亚等主要人口中心附近，因此构成重大威胁。在过去的一个世纪里，不列颠哥伦比亚省西南部发生的最具破坏性的地震是温哥华岛中部的地壳地震。最近才发现的第四类地震涉及板块边界深处的非常缓慢的滑动。尽管不是直接威胁，但越来越多的证据表明，这些慢滑地震通过俯冲板块的结构和其中产生的流体的迁移/运输，与其他类型的地震具有遗传联系。本研究旨在澄清这些关联。

Over the next 5 years my research program will focus on 2 key problems in global seismology, one observational and the other theoretical. The first project concerns the physical state of the subducting Juan de Fuca plate from Vancouver Island to California and its influence on earthquake occurrence. A number of different styles of earthquake, each with its own significance for seismic hazard, occur in this region. Megathrust earthquakes, comparable in magnitude to the December 2004 Indonesian earthquake, occur every 550 years on average. Deep slab earthquakes, although smaller in magnitude, 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 a direct threat, there is growing evidence that these slow slip earthquakes bear genetic associations with other classes of earthquake through the structure of the subducting plate and the migration/transport of fluids generated therein. This research aims to clarify these associations.