重庆荣昌地区注水诱发地震加密观测
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摘要
荣昌地区地震活动性原本很弱,历史上无5级以上地震的记载。但自20世纪80年代末期开始,随着工业部门将采集天然气过程产生的污水通过废井回灌,该区地震活动明显增强,震级逐渐增大,并于1997年发生了5.2级地震,从而为研究注水诱发地震提供了理想的场所。由于该地区仅有一个地震台,监测能力和定位精度很低,难以满足研究工作的需求。地震动力学国家重点实验室会同日本地质调查所和重庆市地震局于2008年7月在荣昌地区架设了6套流动台站,对该区地震活动进行连续观测。在提高监测能力的同时,使地震震源的定位能力得到了明显的提高,为深入研究地震时空分布特征及注水诱发地震的机制提供了基础。
Rongchang area had exhibited low levels of natural seismicity,and there was no record of earthquake with ML>5 in the history.However,following the injection of unwanted water from gas production,seismicity has increased dramatically and showed progressive increase of magnitude since July 1988,and an earthquake of M5.2 occurred in 1997.Rongchang area is thus an ideal site for studying seismicity induced by deep well injection.Unfortunately,there was only one seismic station in the area,and the research was limited by the poor detectability and hypocenter location accuracy.In order to make a thorough investigation on the injection-induced seismicity in the area,a temporal seismic network was installed in July,2008 under the cooperation of the State Key Laboratory of Earthquake Dynamics,Geological Survey of Japan and Chongqing Earthquake Administration.The seismic network consists of 6 stations,by which waveforms are continuously recorded.As a result,both the detectability and location accuracy are improved greatly.This paper presents a brief summary of the cooperative project and some preliminary results of recent seismicity in the area.
Rongchang area had exhibited low levels of natural seismicity,and there was no record of earthquake with ML>5 in the history.However,following the injection of unwanted water from gas production,seismicity has increased dramatically and showed progressive increase of magnitude since July 1988,and an earthquake of M5.2 occurred in 1997.Rongchang area is thus an ideal site for studying seismicity induced by deep well injection.Unfortunately,there was only one seismic station in the area,and the research was limited by the poor detectability and hypocenter location accuracy.In order to make a thorough investigation on the injection-induced seismicity in the area,a temporal seismic network was installed in July,2008 under the cooperation of the State Key Laboratory of Earthquake Dynamics,Geological Survey of Japan and Chongqing Earthquake Administration.The seismic network consists of 6 stations,by which waveforms are continuously recorded.As a result,both the detectability and location accuracy are improved greatly.This paper presents a brief summary of the cooperative project and some preliminary results of recent seismicity in the area.
引文
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丁仁杰,李克昌,等.2004.重庆地震研究[M].北京:地震出版社.DING Ren-jie,LI Ke-chang et al.2004.Research of Earthquakes in Chongqing[M].Seismological Press,Beijing(inChinese).
黄世源,魏红梅,朱丽霞.2007.2006年荣昌地震活动与注水关系[J].高原地震,19(2):8—11.HUANG Shi-yuan,WEI Hong-mei,ZHU Li-xia.2007.Relation between seismic activities and water-injection[J].Plat-eau Earthquake Research,19(2):8—11(in Chinese).
四川省地质矿产局.1991.四川省区域地质志[M].北京:地质出版社.Bureau of Geology and Mineral Resources of Sichuan Province.1991.Regional Geology of Sichuan Province[M].Ge-ological Publishing House,Beijing(in Chinese).
朱丽霞,黄世源,魏红梅.2007.荣昌地区注水地震研究[J].大地测量与地球动力学,27(6):86—90.ZHU Li-xia,HUANG Shi-yuan,WEI Hong-mei.2007.On fluid-injection induced earthquake in Rongchang area[J].Journal of Geodesy and Geodynamics,27(6):86—90(in Chinese).
Lei Xinglin,Yu Guozheng,Ma Shengli,et al.2008.Earthquakes induced by water injection at～3km depth within theRongchang gas field,Chongqing,China[J].Journal of Geophysical Research,11:B10310.
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