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Non-double-couple mechanisms of microearthquakes induced by hydraulic fracturing
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SYSNO ASEP 0315244 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Non-double-couple mechanisms of microearthquakes induced by hydraulic fracturing Title Nestřižné složky mechanismu mikrozemětřesení indukovaných hydraulickým rozrušováním Author(s) Šílený, Jan (GFU-E) ORCID, RID
Eisner, L. (GB)
Hill, D. P. (US)
Cornet, F. H. (FR)Source Title Rome 2008. 70th EAGE conference & exhibition incorporating SPE EUROPEC 2008. Extended abstract & exhibitors' catalogue. - Houten : EAGE, 2008 - ISBN 978-90-73781-53-5 Pages s. 16-20 Number of pages 5 s. Publication form CD ROM - CD ROM Action EAGE conference & exhibition incorporating SPE EUROPEC 2008 /70./ Event date 09.06.2008-12.06.2008 VEvent location Rome Country IT - Italy Event type EUR Language eng - English Country NL - Netherlands Keywords microearthquakes ; hydraulic fracturing ; source mechanisms Subject RIV DC - Siesmology, Volcanology, Earth Structure R&D Projects IAA300120502 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30120515 - GFU-E (2005-2011) Annotation We have inverted polarity and amplitude information of representative microearthquakes to investigate source mechanisms of seismicity induced by hydraulic fracturing in the Carthage Cotton Valley gas field. With vertical arrays of four and eight geophones in two monitoring wells, respectively, we were able to reliably determine source mechanisms of the strongest events with the best signal-to-noise ratio. Our analysis indicates predominantly non-double-couple source mechanisms with positive volumetric component consistent with opening cracks oriented close to expected hydraulic fracture orientation. Our observations suggest the induced events are directly the result of opening cracks by fluid injection, in contrast to many previous studies where the seismicity is interpreted to be primarily shearing caused by pore-pressure diffusion into the surrounding rock or associated with shear stresses created at the hydraulic fracture tip. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2009
Number of the records: 1