注水诱发地震的谱振幅相关系数及视应力研究
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摘要
以四川自贡和长宁两个注水地区为例,基于区域测震台网记录的数字地震波形资料和观测报告,分析注水诱发地震的谱振幅相关系数特征及其与当地加压注水数据的关系,并结合表征绝对应力水平的视应力综合分析研究自贡和长宁地区的应力状态。结果表明,自贡和长宁地区注水诱发地震的谱振幅相关系数均在高值波动,其均值分别为0.89和0.90,且变化过程与加压注水数据具有很好的相关性。分析认为加压注水对局部区域应力场产生扰动影响,使地下浅层裂隙呈优势取向排列,引发的中小地震震源机制表现出较好的相似性,但其视应力结果显示研究区域的应力水平并不高。
Taking Zigong and Changning which are both water injection areas in Sichuan as the study regions,based on digital seismic waveform recorded by regional seismic netw ork and observation report,we analyze the characteristic of correlation coefficient of spectral amplitude of water injection induced earthquake and the relationship betw een correlation coefficient and water injection data. Then combining the apparent stress which represents the absolute stress level,we analyze the stress intensity of the tw o study regions. The result shows that the correlation coefficients of spectral amplitude of water injection induced earthquakes both fluctuate at high value and the average values are 0. 89 and 0. 90 in Zigong and Changning areas respectively,and the changing process of correlation coefficient has a good correlation with water injection data. The pressurized water injection has the disturbance influence on stress field in local region,thus the fractures of underground shallow layer arrange in predominant direction,and the focal mechanisms of water injection induced small-moderate earthquakes shows good similarity,however,the apparent stress results indicate that the stress is lower in the study region.
Taking Zigong and Changning which are both water injection areas in Sichuan as the study regions,based on digital seismic waveform recorded by regional seismic netw ork and observation report,we analyze the characteristic of correlation coefficient of spectral amplitude of water injection induced earthquake and the relationship betw een correlation coefficient and water injection data. Then combining the apparent stress which represents the absolute stress level,we analyze the stress intensity of the tw o study regions. The result shows that the correlation coefficients of spectral amplitude of water injection induced earthquakes both fluctuate at high value and the average values are 0. 89 and 0. 90 in Zigong and Changning areas respectively,and the changing process of correlation coefficient has a good correlation with water injection data. The pressurized water injection has the disturbance influence on stress field in local region,thus the fractures of underground shallow layer arrange in predominant direction,and the focal mechanisms of water injection induced small-moderate earthquakes shows good similarity,however,the apparent stress results indicate that the stress is lower in the study region.
引文
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程万正,陈学忠,乔慧珍.2006a.四川地震辐射能量和视应力的研究[J].地球物理学进展,21(3):692-699.
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周连庆,赵翠萍,修济刚,等.2008.利用天然地震研究地壳Q值的方法和进展[J].国际地震动态,(2):1-11.
朱航,刘杰,陈天长.2006.采用体波谱振幅相关系数方法研究地震序列的震源机制变化过程[J].地震,26(2):1-11.
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Kanamori H..1977.The Energy Release in Great Earthquakes[J].J.Geophys.Res.,82(20):2981-2987.
Lund B.,Bvarsson R..2002.Correlation of Microearthquake Bodywave Spectral Amplitudes[J].Bull.Seism.Soc.Am.,92(6):2419-2433.
Michael A.J.,Ellsworth W.L.,Oppenheimer D.H..1990.CoseismicStress Changes Induced by the 1989 Loma Prieta,California Earthquake[J].Geophys.Res.Lett.,17(9):1441-1444.
Moya C.A.,Aguirre J.,Irikura K..2000.Inversion of Source Parametersand Site Effects from Strong Ground Motion Records using GeneticAlgorithms[J].Bull.Seism.Soc.Amer.,90(4):977-992.
Seeber L.,Armbruster J.G..2000.Earthquakes as Beacons of StressChange[J].Nature,407(6800):69-72.
Wiemer S.,Gerstenberger M.,Hauksson E..2002.Properties of the Aftershock Sequence of the 1999 MW7.1 Hector Mine earthquake:Implications for Aftershock Hazard[J].Bull.Seism.S.Am.,92(4):1227-1240.
Wu Z.L..2001.Scaling of Apparent Stress from Broadband Radiated Energy Catalogue and Seismic Moment Catalogue and its Focal Mechanism Dependence[J].Earth.Planets.Space.,53:943-948.
Wyss M.,Brune J.N..1968.Seismic Moment,Stress,and Source Dimensions for Earthquakes in the California-Nevada Region[J].J.Gephys.Res.,73(14):4681-4694.
程万正,陈学忠,乔慧珍.2006a.四川地震辐射能量和视应力的研究[J].地球物理学进展,21(3):692-699.
程万正,阮祥,张永久.2006b.川滇次级地块震源机制类型与一致性参数[J].地震学报,28(6):561-573.
崔子健,李志雄,陈章立,等.2012.判别小震群序列类型的新方法研究——谱振幅相关分析法[J].地球物理学报,55(5):1718-1724.
刁桂苓,徐锡伟,陈于高,等.2011.汶川MW7.9和集集MW7.6地震前应力场转换现象及其可能的前兆意义[J].地球物理学报,54(1):128-136.
刁桂苓,于利民,李钦祖.1994.强震前后震源区应力场变化一例[J].地震学报,16(1):64-69.
丁健民,高莉青.1981.地壳水平应力与垂直应力随深度的变化[J].地震,2:46-48.
李方全,祁英男.1988.地壳应力随深度的变化规律[J].岩石力学与工程学报,7(4):301-309.
刘杰,郑斯华,黄玉龙,等.2003.利用遗传算法反演非弹性衰减系数、震源参数和场地响应[J].地震学报,25(2):211-218.
乔慧珍,张永久,程万正,等.2006.川西北地区介质衰减特征研究[J].地震地磁观测与研究,27(4):1-7.
阮祥,程万正,张永久,等.2008.四川长宁盐矿井注水诱发地震研究[J].中国地震,24(3):226-234.
吴忠良,黄静,林碧苍.2002.中国西部地震视应力的分布[J].地震学报,24(3):293-301.
张致伟,程万正,梁明剑,等.2012.四川自贡—隆昌地区注水诱发地震研究[J].地球物理学报,55(5):1635-1645.
张致伟,程万正,吴朋,等.2013.自贡—隆昌地区地震重新定位及P波速度结构研究[J].中国地震,29(1):37-47.
周连庆,赵翠萍,修济刚,等.2008.利用天然地震研究地壳Q值的方法和进展[J].国际地震动态,(2):1-11.
朱航,刘杰,陈天长.2006.采用体波谱振幅相关系数方法研究地震序列的震源机制变化过程[J].地震,26(2):1-11.
Atkinson G.M.,Mereu R.F..1992.The Shape of Ground Motion Attenuation Curves in Southeastern Canada[J].Bull.Seism.Soc.Amer.,82(5):2014-2031.
Brune J.N..1970.Tectonic Stress and the Spectra of Seismic ShearWaves from Earthquakes[J].J.Geophys.Res.,75(26):4997-5009.
Hauksson E..1994.State of Stress from Focal Mechanisms before and after the 1992 Landers Earthquake Sequence[J].Bull.Seism.Soc.Am,84(3):917-934.
Kanamori H.,Anderson D.L..1975.Theoretical Basis of Some EmpiricalRelations in Seismology[J].Bull.Seism.Soc.Am.,65(5):1073-1095.
Kanamori H..1977.The Energy Release in Great Earthquakes[J].J.Geophys.Res.,82(20):2981-2987.
Lund B.,Bvarsson R..2002.Correlation of Microearthquake Bodywave Spectral Amplitudes[J].Bull.Seism.Soc.Am.,92(6):2419-2433.
Michael A.J.,Ellsworth W.L.,Oppenheimer D.H..1990.CoseismicStress Changes Induced by the 1989 Loma Prieta,California Earthquake[J].Geophys.Res.Lett.,17(9):1441-1444.
Moya C.A.,Aguirre J.,Irikura K..2000.Inversion of Source Parametersand Site Effects from Strong Ground Motion Records using GeneticAlgorithms[J].Bull.Seism.Soc.Amer.,90(4):977-992.
Seeber L.,Armbruster J.G..2000.Earthquakes as Beacons of StressChange[J].Nature,407(6800):69-72.
Wiemer S.,Gerstenberger M.,Hauksson E..2002.Properties of the Aftershock Sequence of the 1999 MW7.1 Hector Mine earthquake:Implications for Aftershock Hazard[J].Bull.Seism.S.Am.,92(4):1227-1240.
Wu Z.L..2001.Scaling of Apparent Stress from Broadband Radiated Energy Catalogue and Seismic Moment Catalogue and its Focal Mechanism Dependence[J].Earth.Planets.Space.,53:943-948.
Wyss M.,Brune J.N..1968.Seismic Moment,Stress,and Source Dimensions for Earthquakes in the California-Nevada Region[J].J.Gephys.Res.,73(14):4681-4694.
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