“霍山地震窗”小震序列运动学参数时变特征研究
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摘要
利用安徽及邻近地区的数字化地震资料,详细研究了“霍山地震窗口”小震序列的构造环境背景应力和视应力变化特征。结果表明,环境应力值和视应力值不仅能反映震“源”区的应力背景强弱,在距未来强震震中比较远的特殊构造部位,即素有“地震活动穴位”的地震窗口的小地震,同样能较客观反映出孕震区附近应力环境的信息,在华东中强地震前后应力状态的差异性是显著的。
In this paper,the tectonic ambient shear stress and apparent stress varying characteristics of the small easthquake sequences in "Huoshan seismic window" was studied in detailed by using the digital earthquake data in Anhui Province and its adjacent region.The results indicate that the value of tectonic ambient shear stress and apparent stress not only reflects strong or weak stress background in earthquake source region but also the information of stress background around earthquake generating area in special tectonic position,namely the small earthquake in seismic window of "seismic activity point" farther from the future strong earthquake epicenter.The difference of the stress state is distinct before and after moderately strong earthquake in East China region.
In this paper,the tectonic ambient shear stress and apparent stress varying characteristics of the small easthquake sequences in "Huoshan seismic window" was studied in detailed by using the digital earthquake data in Anhui Province and its adjacent region.The results indicate that the value of tectonic ambient shear stress and apparent stress not only reflects strong or weak stress background in earthquake source region but also the information of stress background around earthquake generating area in special tectonic position,namely the small earthquake in seismic window of "seismic activity point" farther from the future strong earthquake epicenter.The difference of the stress state is distinct before and after moderately strong earthquake in East China region.
引文
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[2]McGarrA,GreenRWE,SpottiswoodeSM.Strong ground motion of mine tremors:Some implicationfor near-source motion parameters[J].Bull Seism Soc Amer,1981,71,295-319.
[3]吴忠良,黄静,林碧苍.中国西部地震视应力的空间分布[J].地震学报,2002,24(3):293-301.
[4]王林瑛,陈佩燕,陈学忠,等.辽宁岫岩地震序列地震运动学参数时变特征的研究[J].地震,2005,25(2):1-8.
[5]陈学忠,王小平,王林瑛,等.地震视应力用于震后趋势快速判定的可能性[J].国际地震动态,2003,(7):1-4.
[6]陈学忠,许向彤,翟文杰.1995年7月20日河北沙城ML4.1地震序列破裂过程中应力变化的研究[J].地震学报,2005,27(3):276-281.
[7]钟羽云,张帆,张震峰,等.应用强震应力降和视应力进行震后趋势快速判定的可能性[J].防灾减灾工程学报,2004,24(1):8-14.
[8]陈培善,陈海通.由环境应力值确定地震危险区的尝试[J].地震地磁观测与研究,1992,13(6):1-11.
[9]WyssM,BruneJN.Seismicmoment,stress,and source dimensions for earthquakes in the California-Nevada region[J].J Geophys Res,1968,73,4 681-4 694.
[10]陈运泰.地震能量和地震效率[A].中国地震局监测预报司.地震参数数字地震学在地震预测中的应用[C].北京:地震出版社,2003.51-72.
[2]McGarrA,GreenRWE,SpottiswoodeSM.Strong ground motion of mine tremors:Some implicationfor near-source motion parameters[J].Bull Seism Soc Amer,1981,71,295-319.
[3]吴忠良,黄静,林碧苍.中国西部地震视应力的空间分布[J].地震学报,2002,24(3):293-301.
[4]王林瑛,陈佩燕,陈学忠,等.辽宁岫岩地震序列地震运动学参数时变特征的研究[J].地震,2005,25(2):1-8.
[5]陈学忠,王小平,王林瑛,等.地震视应力用于震后趋势快速判定的可能性[J].国际地震动态,2003,(7):1-4.
[6]陈学忠,许向彤,翟文杰.1995年7月20日河北沙城ML4.1地震序列破裂过程中应力变化的研究[J].地震学报,2005,27(3):276-281.
[7]钟羽云,张帆,张震峰,等.应用强震应力降和视应力进行震后趋势快速判定的可能性[J].防灾减灾工程学报,2004,24(1):8-14.
[8]陈培善,陈海通.由环境应力值确定地震危险区的尝试[J].地震地磁观测与研究,1992,13(6):1-11.
[9]WyssM,BruneJN.Seismicmoment,stress,and source dimensions for earthquakes in the California-Nevada region[J].J Geophys Res,1968,73,4 681-4 694.
[10]陈运泰.地震能量和地震效率[A].中国地震局监测预报司.地震参数数字地震学在地震预测中的应用[C].北京:地震出版社,2003.51-72.
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