0351656 - GFÚ 2011 RIV NL eng C - Conference Paper (international conference)
Horálek, Josef - Jechumtálová, Zuzana - Dorbath, L. - Šílený, Jan
Source mechanisms in the intense seismicity induced by fluids injection at the Soultz HDR site, Alsace, in 2003.
Barcelona '10. Conference Proceedings & Exhibitors' Catalogue. Houten: EAGE, 2010, s. 1679-1683. ISBN 978-90-73781-86-3.
[EAGE Conference & exhibition incorporationg SPE EUROPEC 2010 /72./. Barcelona (ES), 14.06.2010-17.06.2010]
R&D Projects: GA AV ČR IAA300120911; GA ČR GAP210/10/1728
Institutional research plan: CEZ:AV0Z30120515
Keywords : source mechanisms * moment tensor * Soultz-sous-Forets site
Subject RIV: DC - Siesmology, Volcanology, Earth Structure

We have inverted the peak amplitudes of direct P waves of 45 micro earthquakes with magnitudes of between M=1,4 and 2,9 which occurred during the 2003 massive fluid injection in the borehole of the Soultz site. The full moment tensor expression of the mechanism was applied. Surprisingly, the mechanisms of all are dominantly pure shears. The T-axes are fairly stable, being concentrated subhorizontally roughly in the EW direction. On the contrary, the P-axes are all-constrained varying in the NS direction from nearly vertical to nearly horizontal, which points to heterogeneous stress in the Soultz injected volume. This is in agreement with the stress pattern from in-situ measurements.

Permanent Link: http://hdl.handle.net/11104/0191362