Seismic crustal structure beneath the BC convergent margin

俯冲的大洋板块和上覆的大陆板块之间的界面目前处于锁定状态，正在积累能量，这些能量将在未来类似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使海底破裂，并促成海啸的产生。目前，甚至连温哥华岛外海域是否发生过小规模地震这样的基本信息都缺乏。这些信息对于向公众通报地震、海啸和海底滑坡危害提供科学依据至关重要，并可能有助于防止潜在的生命损失。2010年夏天，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厅(JAMSTEC)的地震学家合作，部署了33台海底地震仪(OBS)，为期3个月。此外，来自伍兹霍尔海洋研究所的10个宽带OBS(目前部署为期1年)加上2个近乎实时的海王星-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在2012年进行，将在更有针对性的研究中部署约35个日本OBSS。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。宽带仪器还将允许我们记录“极低频率地震”，这是一种通常与低幅度地震有关的慢滑事件。

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.