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Minimum 1d P- and S- Velocity Models Derived From Aftershocks of the March 31st, 2020 Stanley, Idaho Earthquake

Description: 

On March 31^st of 2020, a magnitude 6.5 earthquake occurred in Central Idaho, 30 km northwest of Stanley, Idaho. To date, the main shock and the aftershocks have not been mapped to any known fault and understanding of the subsurface geology is sparse. For these reasons, a high-resolution 3D tomography model of this region is considered high priority. In preparation for the 3D tomography study, around 1,000 aftershocks were located using 13 temporary stations. These events were used to calculate a minimum 1D velocity model. The final catalog for this study includes 868 events all of which used at least 6 phases to locate the earthquake. A velocity model derived from a recent receiver function study was used for the initial locations. The final 1D minimum model was derived using the iterative VELEST software. Comparison between the initial locations and the relocations using the newly derived 1D model show a significant improvement in the quality of hypocenter parameters of the earthquakes using the in study. Since a minimum 1D model represents a solution to the coupled hypocenter-velocity problem, the final velocity model will be used in further analysis of earthquakes in Central Idaho. It is also an appropriate reference model for 3D tomography modeling using a larger earthquake catalog.

Session: It’s All About Relocation, Relocation, Relocation [Poster]

Type: Poster

Date: 4/20/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Blaine Bockholt

Student Presenter: No

Invited Presentation: 

Authors