Correlation between the coulomb stress and occurrence of the large induced seismicity at Basel, Switzerland in 2006

Yusuke Mukuhira, Hiroshi Asanuma, Markus Häring

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

One of the critical problems in the development and operation of enhanced geothermal systems and hydrothermal reservoirs is the occurrence of felt earthquakes. Having previously shown that increases in pore pressure did not trigger the widely felt induced events observed at Basel, Switzerland, in 2006, we considered the possible triggering role of stress redistribution caused by preceding seismic events. We calculated static stress redistribution on the fault planes of the large events that were induced by preceding events, using the Coulomb 3 software package to model stress redistribution on a single fracture in a uniform crust. We found that average Coulomb stress decreased on many of the fault planes of the large events, bringing stability to the fractures. Although portions of the fault plane of the largest event showed positive changes in Coulomb stress, our modeling did not show a significant increase in Coulomb stress on this fault plane around the time of that event. We conclude that static stress redistribution did not trigger these large induced events. We also did not find any evidence that the magnitude of the events was correlated with static stress redistribution. Instead, stress redistribution in the fracture network, changes in the friction coefficient, or some undiscovered phenomenon may be the trigger mechanism.

Original languageEnglish
Title of host publicationGeothermal Resources Council Annual Meeting 2012, GRC 2012 - Geothermal
Subtitle of host publicationReliable, Renewable, Global
Pages523-528
Number of pages6
Publication statusPublished - 2012 Dec 1
EventGeothermal Resources Council Annual Meeting 2012 - Geothermal: Reliable, Renewable, Global, GRC 2012 - Reno, NV, United States
Duration: 2012 Sep 302012 Oct 3

Publication series

NameTransactions - Geothermal Resources Council
Volume36 1
ISSN (Print)0193-5933

Other

OtherGeothermal Resources Council Annual Meeting 2012 - Geothermal: Reliable, Renewable, Global, GRC 2012
CountryUnited States
CityReno, NV
Period12/9/3012/10/3

Keywords

  • Basel
  • Coulomb stress
  • EGS
  • HDR
  • Magnitude
  • Microseismicity
  • Stimulation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Geophysics

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  • Cite this

    Mukuhira, Y., Asanuma, H., & Häring, M. (2012). Correlation between the coulomb stress and occurrence of the large induced seismicity at Basel, Switzerland in 2006. In Geothermal Resources Council Annual Meeting 2012, GRC 2012 - Geothermal: Reliable, Renewable, Global (pp. 523-528). (Transactions - Geothermal Resources Council; Vol. 36 1).