Regional Alaska Earthquake Moment Tensors Inverted Using 3D Green’s Functions
Moment tensors are a fundamental seismological product that benefit our understanding of the active tectonic processes on Earth. Global moment tensor solutions are automatically calculated by several entities (GCMT, USGS) for earthquakes above Mw 5, and they rely on relatively long-period waves for the processing. At regional and local scales, smaller-magnitude (Mw 4-5) moment tensor solutions are routinely estimated using high frequency Green’s functions calculated from 1D velocity models. Both global and regional moment tensor solutions contain greater uncertainties because of inaccuracies in the 1D velocity models relative to real (three-dimensional) Earth structure. Here we calculate receiver-side Green’s functions in a 3D velocity model using the software package SPECFEM3D_GLOBE, and we use the resulting database to invert for the moment tensor solutions of 70 regional earthquakes in Alaska using the Python-based package MTUQ. These earthquakes were carefully chosen with the intent of using them in a later tomographic study, in which the quality of the moment tensor solution influences the quality of the resulting tomographic model.
Session: Earthquake Source Parameters: Theory, Observations and Interpretations [Poster]
Type: Poster
Room: Ballroom
Date: 4/18/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Amanda McPherson
Student Presenter: Yes
Additional Authors
Amanda McPherson Presenting Author Corresponding Author ammcpherson@alaska.edu University of Alaska Fairbanks |
Carl Tape ctape@alaska.edu University of Alaska Fairbanks |
Julien Thurin jthurin@alaska.edu University of Alaska Fairbanks |
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Regional Alaska Earthquake Moment Tensors Inverted Using 3D Green’s Functions
Category
Earthquake Source Parameters: Theory, Observations and Interpretations
Description