Characterization of microseismic events with larger magnitude collected at Basel, Switzerland in 2006

Yusuke Mukuhira, Hiroshi Asanuma, Hiroaki Niitsuma, Ulrich Schanz, Markus Häring

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

12 Citations (Scopus)

Abstract

The authors analyzed microseismic events with large magnitude collected during and after the hydraulic stimulation at Basel in 2006. In this study, we firstly investigated possible physical models that could have been responsible mechanisms for the large events from seismological and rock mechanical points of view, and we listed the expected observational phenomena of each. The characteristics of the large events and their similarity/difference to the neighboring events were then evaluated considering the models. From this analysis is appears that the most of the large events from the middle and deeper parts of the stimulated zone can be interpreted in terms of slip of multiple asperities inside the stimulated zone. Although there are uncertainties in the hypocentral locations for the large events from shallower parts of the stimulated zone, they also might be interpreted by slips of multiple asperities in neighboring subparallel fractures to the stimulated zone. The large events observed at Basel can be interpreted as a kind of induced microseismicity either inside or neighboring the stimulated zone, although the triggering mechanism of the large events after long interval from the bleeding-off should be investigated further.

Original languageEnglish
Title of host publicationGeothermal Resources Council Annual Meeting 2008
Subtitle of host publication"Geothermal - Gaining Steam"
Pages74-80
Number of pages7
Publication statusPublished - 2008 Dec 1
EventGeothermal Resources Council Annual Meeting 2008: "Geothermal - Gaining Steam" - Reno, NV, United States
Duration: 2008 Oct 52008 Oct 8

Publication series

NameTransactions - Geothermal Resources Council
Volume32
ISSN (Print)0193-5933

Other

OtherGeothermal Resources Council Annual Meeting 2008: "Geothermal - Gaining Steam"
CountryUnited States
CityReno, NV
Period08/10/508/10/8

Keywords

  • Basel
  • HDR
  • HFR
  • HWR
  • Magnitude
  • Microseismicity
  • Stimulation

ASJC Scopus subject areas

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

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