Detecting Local Earthquakes in a Noisy Continental Margin Environment

评估从加州北方到不列颠哥伦比亚省南部的卡斯卡迪亚边缘地区的地震活动沿着的地震风险是一个公众非常感兴趣的问题。对地震仪阵列记录的区域地震活动性进行研究是这方面的主要工具，但迄今为止，这类研究主要限于陆上地震仪阵列。在即将到来的卡斯卡迪亚项目中，陆上仪器将通过在卡斯卡迪亚海岸部署60个或更多的海底地震仪（OBS）来补充。2007-2009年在俄勒冈州海岸外适度部署的OBS已经证明了将OBS数据中的相关地震事件与可能的生物起源的脉冲信号分离的巨大困难。该项目旨在开发计算机自动化方法，用于将地震信号从OBS数据中的外来信号中分离出来，特别是对于位于靠近海岸的浅水中的仪器。该项目有一些更广泛的影响，但到目前为止，最重要的是开发这些技术对研究地震活动和地震危险的社会意义非常高，特别是卡斯卡迪亚项目。

Assessing earthquake risk due to seismicity along the Cascadia margin from northern California to southern British Columbia is a matter of great public interest. Studies of regional seismicity recorded by arrays of seismographs are a primary tool for this purpose, but to date such studies have been largely limited to onshore arrays. In the upcoming Cascadia project, onshore instrumentation will be complemented by deployments of 60 or more Ocean Bottom Seismographs (OBS) off the Cascadia coast for several years. A modest deployment of OBSs off the Oregon coast in 2007-2009 has demonstrated the great difficulty of separating relevant seismic events in OBS data from impulsive signals of probable biological origin. This project seeks to develop computer automated methods for separating seismic signals from extraneous signals in the OBS data, particularly for instruments located in shallow water near the coast. The project has a number of broader impacts, but by far the most significant is the very high societal relevance of developing these techniques for studies of seismicity and seismic hazards in general, and for the Cascadia project in particular.