中国东部不同构造区强震前地震非均匀度时间变化特征研究
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摘要
基于中国活动地块划分结果,采用地震非均匀度(GL值)预测方法对中国东部(105°E以东)不同构造区自1975年以来的62次4.7级以上地震进行了计算,结果表明,其中大部分地震前1～3年地震非均匀度参数出现明显异常变化,显示出强震前震中及其临近地区的中小地震活动在时间分布上存在着明显的均匀-非均匀的转换,这种变化的出现时间和结束时间与地震所在构造部位有关,区域中小地震活动状态的变化可能是地震孕育到中期或短期阶段震源局部应力场发生变化的一种表象。
We analysed the results of the seismic inhomogeneous degree(GL value)before the 62 strong earthquakes of magnitudes more than 4.7 distributed in the Eastern China calculated by the regionally small earthquake catalogues based on the result of China active block dividing.The results show that there are obviously abnormal variations of the seismic inhomogeneous degree appeared one to three years before most of the events,and the middle and small seismicity around the epicenter of strong earthquake obviously changes from homogencity to inhomogencity in time distribution before some strong earthquakes.The appearing time and ending time of the state variation before strong earthquakes are related to the tectonic location of the earthquake.The variation of the regionally seismicity state may be the middle-term or short-term behavior of the stress change around the earthquake source.
We analysed the results of the seismic inhomogeneous degree(GL value)before the 62 strong earthquakes of magnitudes more than 4.7 distributed in the Eastern China calculated by the regionally small earthquake catalogues based on the result of China active block dividing.The results show that there are obviously abnormal variations of the seismic inhomogeneous degree appeared one to three years before most of the events,and the middle and small seismicity around the epicenter of strong earthquake obviously changes from homogencity to inhomogencity in time distribution before some strong earthquakes.The appearing time and ending time of the state variation before strong earthquakes are related to the tectonic location of the earthquake.The variation of the regionally seismicity state may be the middle-term or short-term behavior of the stress change around the earthquake source.
引文
1张肇诚,罗兰格,李海华,等.中国震例(1966～1975)[M].北京,地震出版社,1988.1Zhang Zhaocheng,Luo Lange,Li Haihua,et al.Earthquakecases in China(1966-1975)[M].Beijing:SeismologicalPress,1988.(in Chinese)
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3张肇诚,罗兰格,李海华,等.中国震例(1981～1985)[M].北京,地震出版社,1990.3Zhang Zhaocheng,Luo Lange,Li Haihua,et al.Earthquakecases in China(1981-1985)[M].Beijing:SeismologicalPress,1990.(in Chinese)
4陈棋福,郑大林,刘桂萍,等.中国震例(1995～1996)[M].北京,地震出版社,2002.4Chen Qifu,Zheng Dalin,Liu Guiping,et al.Earthquake casesin China(1995-1996)[M].Beijing:Seismological Press,2002.(in Chinese)
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8王炜,宋先月,王峥峥.地震非均匀度在华北地震中短期预报中的应用[J].西北地震学报,2001,23(4):339～345.8Wang Wei,Song Xianyue and Wang Zhengzheng.Seismic in-homogeneous degree and its application to mid-short termearthouake prediction in north China[J].Northwestern Seis-mological Journal,2001,23(4):339-345.(in Chinese)
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10刘桂萍.地震非均匀度方法在华北地区中强地震中期预报中的应用[J].地震,1999,11(1):54～58.10Liu Guiping.Application of the seismic inhomogeneous de-gree to the mid-term prediction before moderately strongearthouakes in north China region[J].Earthquake,1999,11(1):54-58.(in Chinese)
11邓起东,张培震,等.中国活动构造基本特征[J].中国科学(D辑),2002,32(12):1020～1030.11Deng Qidong,Zhang Peizhen,et al.Principal features of theactive tectonics in China[J].Science in China(Series D),2002,32(12):1020-1030.(in Chinese)
12张培震,邓起东,张国民.中国大陆的强震活动与活动地块[J].中国科学,2003,33(增刊):12～19.12Zhang Peizhen,Deng Qidong and Zhang Guomin.Active-tectonic blocks and strong earthquakes in the China main-land[J].Science in China,2003,33(Supp.):12-19.(inChinese)
13张国民,马宏生,王辉,等.中国大陆活动地块边界带与强震活动[J].地球物理学报,2005,48(3):602～610.13Zhang Guomin,Ma hongsheng,Wang Hui,et al.Boundariesbetween active-tectonic blocks and strong earthquakes inthe China mainland[J].Journal of Geophysics,2005,48(3):602-610.(in Chinese)
2张肇诚,罗兰格,李海华,等.中国震例(1976～1980)[M].北京,地震出版社,1990.2Zhang Zhaocheng,Luo Lange,Li Haihua,et al.Earthquakecases in China(1976-1980)[M].Beijing:SeismologicalPress,1990.(in Chinese)
3张肇诚,罗兰格,李海华,等.中国震例(1981～1985)[M].北京,地震出版社,1990.3Zhang Zhaocheng,Luo Lange,Li Haihua,et al.Earthquakecases in China(1981-1985)[M].Beijing:SeismologicalPress,1990.(in Chinese)
4陈棋福,郑大林,刘桂萍,等.中国震例(1995～1996)[M].北京,地震出版社,2002.4Chen Qifu,Zheng Dalin,Liu Guiping,et al.Earthquake casesin China(1995-1996)[M].Beijing:Seismological Press,2002.(in Chinese)
5李志雄,高旭.地震非均匀度的研究及在强震中期预报中的应用[J].地震,1994,6:11～17.5Li Zhixiong and Gao Xu.Study on the inhomogenous degreeof seismicity and its application to middle-term earthquakeprediction[J].Earthquake,1994,6:11-17.(in Chinese)
6李志雄,马胜利,李圣强,等.地震非均匀度物理意义的实验研究[J].地震学报,2005,27(6):682～690.6Li Zhixiong,Ma Shengli,Li Shenqiang,et al.Study on thephysical meaning of seismic inhomogengous degree by rockfracture experiments[J].Acta Seismologica Sinica,2005,27(6):682-690.(in Chinese)
7刘丽芳,付红.2003年云南大姚6.2级、6.1级地震中短期地震学异常演化特征[J].地震地磁观测与研究,2005,16(5):33～38.7Liu Lifang and Fu Hong.Dynamic characteristics of mediumand short term seismic anomalies for2003,Ms6.2&Ms6.1Dayao earthquakes in Yunnan[J].Seismological andGeomagnetic Observation and Research,2005,16(5):33-38.(in Chinese)
8王炜,宋先月,王峥峥.地震非均匀度在华北地震中短期预报中的应用[J].西北地震学报,2001,23(4):339～345.8Wang Wei,Song Xianyue and Wang Zhengzheng.Seismic in-homogeneous degree and its application to mid-short termearthouake prediction in north China[J].Northwestern Seis-mological Journal,2001,23(4):339-345.(in Chinese)
9王炜,宋先月,谢端,等.地震非均匀度在华北地震中期预报中的应用[J].中国地震,2001,9(3):263～270.9Wang Wei,Song Xianyue,Xie Duan,et al.Seismic inhomo-geneous degree and its application to mid-term earthouakeprediction in north China[J].Earthquake Research in Chi-na,2001,9(3):263-270.(in Chinese)
10刘桂萍.地震非均匀度方法在华北地区中强地震中期预报中的应用[J].地震,1999,11(1):54～58.10Liu Guiping.Application of the seismic inhomogeneous de-gree to the mid-term prediction before moderately strongearthouakes in north China region[J].Earthquake,1999,11(1):54-58.(in Chinese)
11邓起东,张培震,等.中国活动构造基本特征[J].中国科学(D辑),2002,32(12):1020～1030.11Deng Qidong,Zhang Peizhen,et al.Principal features of theactive tectonics in China[J].Science in China(Series D),2002,32(12):1020-1030.(in Chinese)
12张培震,邓起东,张国民.中国大陆的强震活动与活动地块[J].中国科学,2003,33(增刊):12～19.12Zhang Peizhen,Deng Qidong and Zhang Guomin.Active-tectonic blocks and strong earthquakes in the China main-land[J].Science in China,2003,33(Supp.):12-19.(inChinese)
13张国民,马宏生,王辉,等.中国大陆活动地块边界带与强震活动[J].地球物理学报,2005,48(3):602～610.13Zhang Guomin,Ma hongsheng,Wang Hui,et al.Boundariesbetween active-tectonic blocks and strong earthquakes inthe China mainland[J].Journal of Geophysics,2005,48(3):602-610.(in Chinese)
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