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Determination and uncertainty of moment tensors for microearthquakes at Okmok Volcano, Alaska
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SYSNO ASEP 0379890 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Determination and uncertainty of moment tensors for microearthquakes at Okmok Volcano, Alaska Author(s) Pesicek, J. D. (US)
Šílený, Jan (GFU-E) ORCID, RID
Prejean, S. G. (US)
Thurber, C. H. (US)Source Title Geophysical Journal International - ISSN 0956-540X
Roč. 190, č. 3 (2012), s. 1689-1709Number of pages 21 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords earthquake source observations ; volcano seismology ; body waves Subject RIV DC - Siesmology, Volcanology, Earth Structure R&D Projects GAP210/12/2235 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z30120515 - GFU-E (2005-2011) UT WOS 000307571100029 DOI https://doi.org/10.1111/j.1365-246X.2012.05574.x Annotation Efforts to determine general moment tensors (MTs) for microearthquakes in volcanic areas are often hampered by small seismic networks, which can lead to poorly constrained hypocentres and inadequate modelling of seismic velocity heterogeneity. In addition, noisy seismic signals can make it difficult to identify phase arrivals correctly for small magnitude events. However, small volcanic earthquakes can have source mechanisms that deviate from brittle double-couple shear failure due to magmatic and/or hydrothermal processes. Thus, determining reliable MTs in such conditions is a challenging but potentially rewarding pursuit. We pursued such a goal at Okmok Volcano, Alaska, which erupted recently in 1997 and in 2008. The Alaska Volcano Observatory operates a seismic network of 12 stations at Okmok and routinely catalogues recorded seismicity. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2013
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