Risk Assessment of Fracturing Induced Earthquake in the Qiabuqia Geothermal Field, China

Kun Shan, Yanjun Zhang, Yanhao Zheng, Liangzhen Li and Hao Deng
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Kun Shan: College of Construction Engineering, Jilin University, Changchun 130026, China
Yanjun Zhang: College of Construction Engineering, Jilin University, Changchun 130026, China
Yanhao Zheng: Department of Civil, Environmental and Geomatic Engineering, University College London, Gower St., Bloomsbury, London WC1E 6BT, UK
Liangzhen Li: College of Construction Engineering, Jilin University, Changchun 130026, China
Hao Deng: College of Construction Engineering, Jilin University, Changchun 130026, China

Energies, 2020, vol. 13, issue 22, 1-24

Abstract: In order to reduce the harm of induced earthquakes in the process of geothermal energy development, it is necessary to analyze and evaluate the induced earthquake risk of a geothermal site in advance. Based on the tectonic evolution and seismogenic history around the Qiabuqia geothermal field, the focal mechanism of the earthquake was determined, and then the magnitude and direction of in-situ stress were inversed with the survey data. At the depth of more than 5 km, the maximum principal stress is distributed along NE 37°, and the maximum principal stress reaches 82 MPa at the depth of 3500 m. The induced earthquakes are evaluated by using artificial neural network (ANN) combined with in-situ stress, focal mechanism, and tectonic conditions. The predicted earthquake maximum magnitude is close to magnitude 3.

Keywords: induced earthquake; geothermal energy; focal mechanism; in-situ stress; ANN (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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