A Fault-Based Crustal Deformation Model With Buried Dislocation Sources for Slip-Rate Inversion of the Alaska Faults
I apply a fault-based crustal deformation model with buried dislocation sources to estimate on-fault slip rates and off-fault moment rate distribution in Alaska for the long-term National Seismic Hazard Model (NSHM). This model uses the method of Zeng and Shen (2017) to invert for slip-rate and strain-rate parameters based on inputs from Global Positioning System (GPS) velocities and geologic slip-rate constraints. A time-dependent postseismic deformation correction is applied to the data to account for the viscoelastic responses from the 1964 Great Alaska earthquake. I modify the Alaska subduction model from the block model of Elliott and Freymueller (2020) using the USGS Slab2.0 model (Hayes et al., 2018). Faults in Alaska are obtained from the 2023 NSHM Alaska geologic fault model (Powers et al., 2023). The model slip rates are determined using a least-squares inversion. The resulting on-fault model slip rates are compared with the geologic slip rates in Alaska, and the off-fault moment rate is compared with the regional seismicity rate.
Session: The 2023 USGS National Seismic Hazard Model and Beyond [Poster Session]
Type: Poster
Room: Exhibit Hall
Date: 5/1/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Yuehua Zeng
Student Presenter: No
Additional Authors
Yuehua Zeng Presenting Author Corresponding Author zeng@usgs.gov U.S. Geological Survey |
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A Fault-Based Crustal Deformation Model With Buried Dislocation Sources for Slip-Rate Inversion of the Alaska Faults
Category
The 2023 USGS National Seismic Hazard Model and Beyond
Description