前震特征及其识别研究
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摘要
分析了中国大陆地区1970年以来117次中强地震(东部MS≥5.5, 西部MS≥6.0), 其中有直接前震的地震11次, 占9%; 有广义前震的地震63次, 占51%. 直接前震与主震的时间间隔优势分布在30天以内, 空间距离50 km以内, 震级差在1级以上. 利用辽宁数字地震资料, 得到了1999年11月29日和2000年1月15日岫岩MS5.6和5.1地震前的直接前震具有较高的剪应力背景.
In the paper, we analyze 117 moderate strong earthquakes occurred in Chinese mainland ( M S≥5.5 in the east and M S≥6.0 in the west) since 1970, among them, 11 earthquakes (about 9%) have direct foreshocks and 63 earthquakes (about 51%) have generalized foreshocks. The predominant time interval between foreshock and main earthquake is no more than 30 days with a spatial distance less than 50 km and a magnitude difference over 1. From the digital seismic data in Liaoning Province, we know that direct foreshock had an obvious shear stress background before the M S=5.6 and M S=5.1 Xiuyan earthquakes occurred on Nov. 29, 1999 and Jan.15, 2000.
In the paper, we analyze 117 moderate strong earthquakes occurred in Chinese mainland ( M S≥5.5 in the east and M S≥6.0 in the west) since 1970, among them, 11 earthquakes (about 9%) have direct foreshocks and 63 earthquakes (about 51%) have generalized foreshocks. The predominant time interval between foreshock and main earthquake is no more than 30 days with a spatial distance less than 50 km and a magnitude difference over 1. From the digital seismic data in Liaoning Province, we know that direct foreshock had an obvious shear stress background before the M S=5.6 and M S=5.1 Xiuyan earthquakes occurred on Nov. 29, 1999 and Jan.15, 2000.
引文
陈运泰,吴忠良,王培德,等.2000.数字地震学[M].北京:地震出版社,83~90
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陈培善,白彤霞,成瑾.1993.利用数字化加速度或速度记录快速测定矩震级的一种新方法[J].地球物理学报,41(增刊):290~297
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刘正荣,孔绍麟.1986.地震频度衰减与地震预报[J].地震研究,9(1):6~8
陆远忠,陈章立,王碧泉,等.1985.地震预报的地震学方法[M].北京:地震出版社,111~150
梅世蓉,冯德益.1993.中国地震预报概论[M].北京:地震出版社,69~73
朱传镇,王林瑛.1996.前震活动特征及其识别的研究[J].地球物理学报,39(1):80~87
JonesL M,WangBiquan,XuShaoxie.1982.The foreshock sequence ofFebruary4,1975,Haicheng earthquake(M=7.3)[J].J GeophysRes,87:4575~4584
OhnakaM.1993.Critical size of the nucleation zone of earthquake rupture inferred from immediate foreshock activity[J].J PhysEarth,41:45~56
白彤霞,陈培善.1998.利用北京数字化台网资料估计首都圈地区的构造环境剪应力场[J].华南地震,18(1):9~13
陈培善,白彤霞,成瑾.1993.利用数字化加速度或速度记录快速测定矩震级的一种新方法[J].地球物理学报,41(增刊):290~297
林邦慧,李大鹏.1994.前震和前震序列的研究,我国大陆23个地震带(区)地震危险性的极值分析[A].见:国家地震局地球物理研究所主编.地震预报研究论文集[C].北京:地震出版社,105~109
刘正荣,孔绍麟.1986.地震频度衰减与地震预报[J].地震研究,9(1):6~8
陆远忠,陈章立,王碧泉,等.1985.地震预报的地震学方法[M].北京:地震出版社,111~150
梅世蓉,冯德益.1993.中国地震预报概论[M].北京:地震出版社,69~73
朱传镇,王林瑛.1996.前震活动特征及其识别的研究[J].地球物理学报,39(1):80~87
JonesL M,WangBiquan,XuShaoxie.1982.The foreshock sequence ofFebruary4,1975,Haicheng earthquake(M=7.3)[J].J GeophysRes,87:4575~4584
OhnakaM.1993.Critical size of the nucleation zone of earthquake rupture inferred from immediate foreshock activity[J].J PhysEarth,41:45~56
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