Estimation of source parameter of microseismic events with large magnitude collected at Basel, Switzerland in 2006

Yusuke Mukuhira, Hiroshi Asanuma, Hiroaki Niitsuma, Markus Häring, Nicholas Deichmann

研究成果: Conference contribution

4 被引用数 (Scopus)

抄録

Occurrence of microseismic events with large magnitude, which are felt on the surface, has been recently receiving much attention as one of the practical problems in stimulation/production of HDR/HFR/EGS geothermal reservoirs. The microseismic activities with large magnitude have been also reported from some of the hydrothermal geothermal fields. Microseismic events with moment magnitude Mw exceeded 2.0 occurred in deeper and middle part of the microseismic cloud during and just after a hydraulic stimulation at Basel, Switzerland, in 2006. Three more large events (Mw>2.0) occurred in shallower part of the seismic cloud by within two months from the bleeding-off. Because of the occurrence of the large events, the project at Basel has been terminated. The authors estimated some of the seismic source parameters (fault plane solution, seismic moment, size of ruptured area, average slip along fault, and stress drop) of the large events to understand the nature of the shear slip on fractures. Spatial distribution of the hypocenter and the fault plane solution (FPS) showed that most of the FPS of the large events had nearly N-S azimuth and those for small events had NW-SE azimuth. Most of the estimated stress drops were less than 1.0MPa, while some of the large events had larger stress drop. Events with higher stress drop (>1.0MPa) showed a linear relationship between the seismic moment and the ruptured area, suggesting that "scaling law" in natural seismology stands for this data set. Observational facts indicated that control factor of the magnitude is not simply either the size of the fault area or the stress drop.

本文言語English
ホスト出版物のタイトルGeothermal Resources Council Annual Meeting 2010, Geothermal 2010
ページ375-380
ページ数6
出版ステータスPublished - 2010 12月 1
イベントGeothermal Resources Council Annual Meeting 2010, Geothermal 2010 - Sacramento, CA, United States
継続期間: 2010 10月 242010 10月 27

出版物シリーズ

名前Transactions - Geothermal Resources Council
34 1
ISSN(印刷版)0193-5933

Other

OtherGeothermal Resources Council Annual Meeting 2010, Geothermal 2010
国/地域United States
CitySacramento, CA
Period10/10/2410/10/27

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • エネルギー工学および電力技術
  • 地球物理学

フィンガープリント

「Estimation of source parameter of microseismic events with large magnitude collected at Basel, Switzerland in 2006」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル