Poster #244, Seismology
Testing Three Earthquake Early Warning Algorithms (EPIC, FinDer and PLUM) on Simulated Composite Offshore Earthquakes
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Poster Presentation
2021 SCEC Annual Meeting, Poster #244, SCEC Contribution #11187 VIEW PDF
k sequence. To simulate offshore earthquake scenarios, we remove stations near the epicenter to create an artificial “coastline” at increasing distances from the source (ranges 25 - 150 km). This tests distances between the shoreline and the current westernmost ShakeAlert alerting boundary, allowing us to assess behavior for potential offshore events such as in the Cascadia subduction zone, Cape Mendocino triple junction, or California continental borderlands. We find that for the scenarios examined the EPIC source-based algorithm is consistently better at identifying the earthquake epicenter(s), while FinDer and PLUM successfully provide information about where large ground motions occur onshore. Importantly, the three algorithms work well in concert to identify the earthquake location(s) and provide additional information about where strong shaking occurs. We conclude that moving to ground-motion-based alert association and aggregation has the potential to obviate some identified challenges such as untangling individual foreshocks and aftershocks and can produce more robust EEW alerts for offshore events.
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