[S-CG40] Science of slow-to-fast earthquakes

[SCG40-40] Rapid slip modeling of large earthquakes by joint inversion of W-phase and back-projected images

*Yuyang Peng¹、Dun Wang¹、Nozomu Takeuchi² (1.China Univ. of Geosciences、2.Univ. of Tokyo)

キーワード：Rapid slip model, Large earthquake, Joint inversion

We present an innovative finite fault inversion algorithm that combines W-phase finite fault inversion with Image Deconvolution Back-Projection (IDBP) for the rapid determination of coseismic slip models following significant earthquakes. This integrated algorithm synergistically leverages the strengths of both methods, enabling precise determination of moment tensor, slip distribution, and centroid location. The application of this integrated algorithm to the analysis of the 2015 Mw 7.8 Nepal and the 2013 Mw 7.5 Alaska earthquakes yielded results closely aligned with detailed post-earthquake studies, highlighting the algorithm's accuracy and reliability. By overcoming inherent limitations of individual methods, it provides a comprehensive understanding of the earthquake source process. The algorithm's automated implementation potential, requiring minimal parameters, enhances its suitability for near real-time earthquake analysis, with promising applications in disaster mitigation and tsunami hazard assessment.