Seismic crustal structure beneath the BC convergent margin

逆冲下的海洋板块和上覆的大陆板块之间的界面目前被锁住并积累能量，这些能量将在未来类似于1700年9级地震的大地震中释放出来。然而，我们不知道地震是否会破坏海底并导致海啸的产生。目前，缺乏基本的信息，比如温哥华岛近海地区是否有小地震。这些信息对于向公众提供地震、海啸和海底滑坡灾害的科学依据至关重要，并可能有助于防止潜在的生命损失。我与加拿大地质调查局的研究人员和日本海洋地球科学技术机构（JAMSTEC）的地震学家合作，在2010年夏季的3个月时间里，从JAMSTEC部署了33台海底地震仪（obs）。此外，来自伍兹霍尔海洋研究所的10台宽带obs（目前部署为期1年）加上2台近实时海王星-加拿大宽带仪器构成了我们电网的一部分。该项目的第二阶段计划于2012年进行，届时将部署约35台日本obs进行更集中的研究。我们预计，这些部署将使我们能够以前所未有的灵敏度探测地震。宽频仪器还将使我们能够记录“极低频地震”，这种慢滑事件通常与低振幅地震震颤有关。

The interface between the underthrust oceanic plate and over-riding continental plate is currently locked and accumulating energy which will be released in a future great earthquake similar to the magnitude 9 event in 1700. However, we do not know whether the earthquake will rupture the seafloor and contribute to tsunami generation. At present, there is a lack of information as basic as whether there are even any small earthquakes in the region offshore Vancouver Island. Such information is critical to provide the scientific basis for informing the public of earthquake, tsunami and seafloor-landslide hazards, and may help prevent the potential loss of life. In collaboration with researchers at the Geological Survey of Canada and seismologists at the Japan Agency for Marine-Earth Science & Technology (JAMSTEC), I deployed 33 ocean bottom seismometers (OBSs) from JAMSTEC for a 3-month period in summer 2010. As well, 10 broadband OBSs from Woods Hole Oceanographic Institution (currently deployed for 1-year period) plus 2 near-real-time NEPTUNE-Canada broadband instruments form part of our grid. Phase 2 of the project is planned in 2012, with ~35 Japanese OBSs to be deployed in a more focused study. We anticipate that these deployments will allow us to detect earthquakes at an unprecedented sensitivity. The broadband instruments will also allow us to record "Very Low Frequency Earthquakes", slow-slip events often associated with low-amplitude seismic tremor.