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Stability of source mechanisms inverted from P-wave amplitude microseismic monitoring data acquired at the surface
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SYSNO ASEP 0429492 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Stability of source mechanisms inverted from P-wave amplitude microseismic monitoring data acquired at the surface Author(s) Staněk, František (USMH-B) ORCID, RID
Eisner, Leo (USMH-B) RID
Moser, T.J. (NL)Source Title Geophysical Prospecting. - : Wiley - ISSN 0016-8025
Roč. 62, č. 3 (2014), s. 475-490Number of pages 16 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords microseismic monitoring ; inversion ; ray modelling ; source mechanism Subject RIV DC - Siesmology, Volcanology, Earth Structure R&D Projects GAP210/12/2451 GA ČR - Czech Science Foundation (CSF) Institutional support USMH-B - RVO:67985891 UT WOS 000334043300005 EID SCOPUS 84897958992 DOI 10.1111/1365-2478.12107 Annotation We study the stability of source mechanisms inverted from data acquired at surface and near-surface monitoring arrays. The study is focused on P-wave data acquired on vertical components, as this is the most common type of acquisition. We apply ray modelling on three models: a fully homogeneous isotropic model, a laterally homogeneous isotropic model and a laterally homogeneous anisotropic model to simulate three commonly used models in inversion. We use geometries of real arrays, one consisting in surface receivers and one consisting in ‘buried’ geophones at the near-surface. Stability was tested for two of the frequently observed source mechanisms: strike-slip and dip-slip and was evaluated by comparing the parameters of correct and inverted mechanisms. We assume these double-couple source mechanisms and use quantitatively the inversion allowing non-double-couple components to measure stability of the inversion. To test the robustness we inverted synthetic amplitudes computed for a laterally homogeneous isotropic model and contaminated with noise using a fully homogeneous model in the inversion. Analogously amplitudes computed in a laterally homogeneous anisotropic model were inverted in all three models. We show that a star-like surface acquisition array provides very stable inversion up to a very high level of noise in data. Furthermore, we reveal that strike-slip inversion is more stable than dip-slip inversion for the receiver geometries considered here. We show that noise and an incorrect velocity model may result in narrow bands of source mechanisms in Hudson's plots. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2015
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