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Evaluating the Effectiveness of Past and Present Seismic Arrays in Detecting Off-shore Earthquakes in Cascadia

Description: 

The Cascadia Subduction Zone is known to produce devastating large-magnitude earthquakes. Rapidly detecting and locating offshore megathrust earthquakes can be difficult using current seismic station network geometries. Dense arrays and advanced array processing techniques offer the potential for more accurate locations and earlier detections for both small and large earthquakes. This study evaluates the effectiveness of incorporating small-aperture seismic arrays (<2 km) to improve the accuracy of locating offshore and out-of-network events. It focuses on data from earlier array experiments and a new array near Forks, installed specifically for this purpose. Using modern FK-based array processing techniques, we evaluate the potential improvements arrays can bring to the Pacific Northwest Seismic Network's routine operations and the USGS ShakeAlert earthquake early warning system. Preliminary results indicate that using the arrays helps constrain early initial earthquake locations within 1000 km. Enhancing offshore earthquake detection and location is crucial for effective earthquake early warning in Washington and Oregon, and seismic array methods show significant potential to improve the Pacific Northwest Seismic Network’s capabilities.

Session: Performance and Progress of Earthquake Early Warning Systems Around the World [Poster]

Type: Poster

Date: 4/16/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Andrew

Student Presenter: Yes

Invited Presentation: 

Poster Number: 124

Authors