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Accuracy of Finite Fault Slip Estimates in Subduction Zones with Topographic Green's Functions and Seafloor Geodesy

Description: 

Until recently, the lack of seafloor geodetic instrumentation and the use of unrealistically simple, half-space based forward models have resulted in poor resolution of near-trench slip in subduction zone settings. Here, we use a synthetic framework to investigate the impact of topography and geodetic data distribution on coseismic slip estimates in various subduction zone settings. We attempt to recover target slip distributions by using a Bayesian method to invert for slip with two sets of Green’s functions -- one that accounts for topography and one that does not -- and five sets of 50 or more observation points, three that are entirely onland and two that include 5-10 seafloor geodetic sites. We find that failure to account for topography in Green’s functions results in ensembles of recovered slip distributions that often do not include the target model, while the use of both topographic Green's functions and seafloor geodetic data enables an almost perfect recovery of a target slip model, even in the near-trench region.

Session: Opportunities and Challenges in Source Modeling for Seismic Hazard Analysis

Type: Oral

Date: 4/20/2023

Presentation Time: 08:45 AM (local time)

Presenting Author: Leah Langer

Student Presenter: No

Invited Presentation: 

Authors