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Assessing the effectiveness of the shear-tensile-compr essi ve model in earthquake source inversions: synthetic experiments and field application
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SYSNO ASEP 0583510 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Assessing the effectiveness of the shear-tensile-compr essi ve model in earthquake source inversions: synthetic experiments and field application Author(s) Ren, Y. (CN)
Vavryčuk, Václav (GFU-E) ORCID, RID
Zhao, L. (CN)Source Title Geophysical Journal International - ISSN 0956-540X
Roč. 236, č. 1 (2024), s. 161-173Number of pages 13 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords seismicity and tectonics ; earthquake observations ; theoretical seismology OECD category Volcanology Institutional support GFU-E - RVO:67985530 DOI 10.1093/gji/ggad425 Annotation As an alternative to the moment tensor (MT) model for earthquake sources, the shear-tensile- compressi ve (STC) model of fers a kinematic description of the source mechanism and leads to a more robust inversion problem. However, the premise of the source inversion based on STC is to ensure the accuracy of parameter
κdefined as the ratio of the Lam ´e constants, κ= λ/μ, in a fault zone. In this study, we carry out a series of synthetic experiments using P -wave amplitudes in source mechanism inversions based on both the STC and MT models, and consider the influence of noise, the uncertainties in source locations and in the velocity model. We show that the nonlinear STC inversion with an appropriate value of κleads to more accurate result compared to the linear MT inversion. We also propose a new joint-STC inversion method to jointly invert for parameter κand the remaining parameters of the STC model (magnitude and the strik e, dip, rak e and slope angles). The results indicate that our proposed method yields robust results for both the parameter κand focal mechanisms. We apply our joint-STC inversion method to field microearthquake data observed in the West Bohemia region to validate some of the conclusions drawn from the synthetic experiments.Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2025
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