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Finite-Fault Rupture Detector (FinDer) for Earthquake Early Warning and Rapid Impact Estimates: Recent Developments using Large International Earthquakes

Description: 

Rapid fault rupture information is important for estimating seismic ground motion and impact in large earthquakes, which is critical for earthquake early warning (EEW) and rapid response systems. The Finite-Fault Rupture Detector (FinDer) algorithm computes earthquake finite source models (either line-sources or complex rupture polygons) by comparing seismic amplitude distributions with precomputed templates. The algorithm has been adopted by the United States West Coast ShakeAlert EEW system and by other real-time systems, such as in Switzerland, Central America, New Zealand, and Italy. Recent improvements to FinDer address challenges of real-time operations, such as dealing with instrument failures during strong shaking, rupture along complex fault geometries, as well as fault slip estimation using FinDerS. We demonstrate FinDer's new features by running waveform playbacks of global earthquakes, including the 2023 M7.8 Kahramanmaraş sequence in Turkey, the 2016 M7.8 Kaikoura earthquake in New Zealand, and M7.8 scenario earthquakes along the San Andreas Fault in California. The resulting earthquake source models show that FinDer(S) is able to provide timely and accurate earthquake and ground motion information for EEW. FinDer(S) can also improve rapid impact estimates after damaging earthquakes by providing fault rupture information much faster than traditional finite-fault slip models.

Session: End-to-End Advancements in Earthquake Early Warning Systems - I

Type: Oral

Date: 5/3/2024

Presentation Time: 02:15 PM (local time)

Presenting Author: Jessie

Student Presenter: No

Invited Presentation: 

Authors