地震学报(英文版)
地震學報(英文版)
지진학보(영문판)
ACTA SEISMOLOGICA SINICA
2001年
4期
434-439
,共6页
吴富春%宋立胜%朱兴国%王锋%景北科%董星宏%方炜%左永青
吳富春%宋立勝%硃興國%王鋒%景北科%董星宏%方煒%左永青
오부춘%송립성%주흥국%왕봉%경북과%동성굉%방위%좌영청
Based on the analysis of the induced earthquakes in China and abroad, we get some ideas about earthquakes induced by pumping water out of a well or injecting water into a well. The induced earthquakes usually occur near the well, and they are generally small earthquakes. The earthquake sources are shallow, and they belong to the main shock-after shock type of earthquake or the swarm-type of earthquake. The magnitude and the quantity of the induced earthquakes obviously depend on the pressure and the quantity of water pumped or injected. These earthquakes happen as soon as pumping or injecting occurrence, or after ten or twenty days, they may occur at the time of injecting mud or injecting high pressure water when a well is being drilled, or at the time when the ground water is being normally exploited. A large quantity of hot water has been exploited since 1990 in Xi'an, and the quantity of water exploited has been increasing year by year, as a result the groundwater level has been dropping with the water pumped out and the water level is high in summer and low in winter. The earthquakes in Xi'an region belong to the solitary-type and they spread outside Xi'an city where the wells are concentrated but no earthquake happens.The seismic frequency and the energy released have no relation with the quantity of water exploitation or the water level in the well. It is considered that geothermal exploitation does not induce earthquakes in and around Xi'an because of its specially geological condition.