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Injection 2003 in HDR site Soultz-sous-Forets: microearthquake mechanisms and stress pattern
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SYSNO ASEP 0369991 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Injection 2003 in HDR site Soultz-sous-Forets: microearthquake mechanisms and stress pattern Author(s) Jechumtálová, Zuzana (GFU-E) ORCID, RID
Šílený, Jan (GFU-E) ORCID, RID
Horálek, Josef (GFU-E) ORCID, RID
Dorbath, L. (FR)Source Title Third passive seismic workshop Actively Passive! Workshop proceedings. - Houten : EAGE, 2011 - ISBN 978-90-73834-05-7 Pages s. 1-5 Number of pages 5 s. Action Passive seismic workshop Actively Passive! /3./ Event date 27.03.2011-30.03.2011 VEvent location Athens Country GR - Greece Event type WRD Language eng - English Country NL - Netherlands Keywords moment tensor ; tectonic stress evaluation ; Angelier method ; temporal and space variations Subject RIV DC - Siesmology, Volcanology, Earth Structure R&D Projects GAP210/10/1728 GA ČR - Czech Science Foundation (CSF) IAA300120911 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30120515 - GFU-E (2005-2011) Annotation Stress evaluation is an immediate benefit of determination of fault-plane solution of events that occur on pre-existing faults within a zone of interest. We have retrieved the moment tensors of 45 microearthquakes with magnitudes between M=1.4 and 2.9 which occurred during the 2003 massive fluid injection in the borehole of the Soultz HDR-site. Surprisingly, the mechanisms were predominantly pure shear slips, i.e. with source mechanisms typical for tectonic earthquakes. To estimate the stress state within the zone of the hypocentra, we applied the approach of Angelier (2002), minimizing the slip shear stress component, advantageously avoiding a prior discrimination between fault and auxiliary plane. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2012
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