Joint Inversion Using Waveform, First-motion Polarities and InSAR Deformation for the 2007 Crandall Canyon Mine Collapse, Utah
Description:
On August 6, 2007, a major underground collapse at the Crandall Canyon coal mine in Utah caused a 3.9 local magnitude (ML) earthquake (Pechmann et al., 2008). Ford et al. (2008) modeled regional waveforms for the full moment tensor finding the event consisted of a primary vertical collapsing crack and a secondary near-vertical shear at the western edge of the collapse. Significant deformation after the event was also measured using Interferometric Synthetic Aperture Radar (InSAR) (e.g., Lu and Wecks, 2010; Planttner et al., 2010). Recently, joint source-type inversions have been used to analyze underground North Korean nuclear explosions, combining regional waveform data, first-motion polarity, and InSAR deformation (Chi-Durán et al., 2021). This technique is effective at improving source type estimates, independently constraining location (and depth), and reducing uncertainties in scalar moment. Our joint inversion for the Crandall Canyon Mine Collapse identified the event as principally a closing crack, with a waveform variance fit of 60%, first-moment polarity fit of 45% and a line-of-sight deformation fit of 90%. Our joint inversion results are consistent with previous studies of this event, providing better constraints of the source-type, moment tensor and scalar moment. These results together with those for the 4th and 6th DPRK explosions (e.g. Chi-Durán et al., 2021, 2024) show the ability to distinguish explosions and collapses, which in the past have been problematic for traditional discrimination methods (e.g. Walter et al., 2018).
Session: Advancements in Forensic Seismology and Explosion Monitoring - IV
Type: Oral
Date: 5/2/2024
Presentation Time: 05:30 PM (local time)
Presenting Author: Rodrigo
Student Presenter: No
Invited Presentation:
Authors
Rodrigo Chi-Durán Presenting Author Corresponding Author rodrigo.chi@berkeley.edu University of California, Berkeley |
Douglas Dreger ddreger@berkeley.edu University of California, Berkeley |
Arthur Rodgers rodgers7@llnl.gov Lawrence Livermore National Laboratory |
Danielle Lindsay danielle.lindsay@berkeley.edu University of California, Berkeley |
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Joint Inversion Using Waveform, First-motion Polarities and InSAR Deformation for the 2007 Crandall Canyon Mine Collapse, Utah
Category
Advancements in Forensic Seismology and Explosion Monitoring