Detecting Local Earthquakes in a Noisy Continental Margin Environment

评估从加利福尼亚州北部到不列颠哥伦比亚省南部卡斯卡迪亚边缘地区地震活动造成的地震风险是一件公众非常感兴趣的事情。由地震仪阵列记录的区域地震活动研究是实现这一目的的主要工具，但迄今为止，这种研究主要局限于陆上阵列。在即将到来的卡斯卡迪亚项目中，陆上仪器的补充将是在卡斯卡迪亚海岸外部署60台或更多海底地震仪(OBS)，为期几年。2007-2009年在俄勒冈州海岸外适度部署的OBSS表明，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开是非常困难的。该项目寻求开发计算机自动化方法，以便将OBS数据中的地震信号与外部信号分开，特别是用于位于海岸附近浅水的仪器。该项目有许多更广泛的影响，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灾害，特别是对卡斯卡迪亚项目具有很高的社会意义。

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.