山东及其近海小震群活动特征研究
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摘要
对山东及其近海30多年来发生的39次小震群资料进行了系统的整理、分析。结果表明:这39次小震群大多分布在断裂带上,发生在2条(或2条以上)断裂交汇部位的占67%,这些容易发生小震群的断层大多为走滑性质的活动断裂,占到86.5%;其中主余型的占57%,双震型的占32%,多震型的占11%,该区震群活动与外围的中、强地震对应率为56%,其中的较显著小震群与外围的中、强地震对应率为71%。对震群与中强地震的间隔时间和间隔距离,以及与区域地震构造的关系进行了初步分析。
In this paper,39 small seismic swarms occurring in Shandong Province and its nearby ocean floor during the past more than 30 years were classified and analyzed systematically.The results show that the 39 small seismic swarms mostly distributed on seismic faults,67% of which took place on the jointing parts of 2 or more faults.86.5% of the faults,where small seismic swarms are easily be triggered,are active strike slip faults.57% of the small seismic swarms are of the mainshock-aftershock type,32% of them are of the double-shock type,and 11% of them,the multiple-shock type.56% of the cases in which a small seismic swarm event in the above region correspond to an earthquake of moderate,or strong,intensity in the periphery region.Among the remarkable small seismic swarms,the corresponding rate is 71%.Parameters of the remarkable seismic swarms are analyzed in this paper.
In this paper,39 small seismic swarms occurring in Shandong Province and its nearby ocean floor during the past more than 30 years were classified and analyzed systematically.The results show that the 39 small seismic swarms mostly distributed on seismic faults,67% of which took place on the jointing parts of 2 or more faults.86.5% of the faults,where small seismic swarms are easily be triggered,are active strike slip faults.57% of the small seismic swarms are of the mainshock-aftershock type,32% of them are of the double-shock type,and 11% of them,the multiple-shock type.56% of the cases in which a small seismic swarm event in the above region correspond to an earthquake of moderate,or strong,intensity in the periphery region.Among the remarkable small seismic swarms,the corresponding rate is 71%.Parameters of the remarkable seismic swarms are analyzed in this paper.
引文
[1]朱传镇,付昌洪,罗胜利.震群与大地震关系的研究(华北地区)[J].地震学报,1981,3(2):105-117Zhu C Z,Fu C H,Luo S L.Study of earthquakeswarms in relation to large earthquakes(North ChinaArea)[J].ACTA Seismologica Sinica,1981,3(2):105-117
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[3]赵兴兰,李艳顺,华爱军,等.由震群信息熵分析山东及沿海地区的地震危险性[J].地震地磁观测与研究,1992,13(4):182-186Zhao X L,Li Y S,Hua A J,et al.Analyzing earth-quake hazard in Shandong Province and surroundingsby swarm INFORMATION ENTROPY[J].Seismo-logical and Geomagnetic Observation and Research,1992,13(4):182-186
[4]周翠英,侯海峰,华爱军,等.山东及其近海区地震序列类型地理分布特征[J].华北地震科学,2001,13(4):15-27Zhou C Y,Hou H F,Hua A J,et al.The geographicdistribution feature of earthquake sequence type inShandong and its offshore area[J].North ChinaEarthquake Sciences,2001,13(4):15-27
[5]国家地震局科技监测司.《地震学分析预报方法程式指南》[M].北京:地震出版社,1990.25-28Department Of Science&Technology And MonitoringChina Seismological Bureau.The Guide to TheMethod of Earthquake Prediction and Analysis[M].Beijing:Earthquake Press,1990.25-28
[6]陆远忠,李胜乐,邓志辉,等.基于GIS的地震分析预报系统[M].成都:成都地图出版社,2002.117-119Lu Y Z,Li S L,Deng Z H,et al.The System ofEarthquake Prediction and Analysis Basing on GIS[M].Chengdn:Chengdu Atlas Press,2002.117-119
[7]华爱军,刘西林,郑建常,等.华北35°线附近地震活动特征与地震危险性预测[J].东北地震研究,2002,(2):24-36Hua A J,Liu X L,Zheng J C,et al.Seismic activitycharacteristics and risk prediction in northen latitude35°region of North China[J].Seismological Researchof Northeast China,2002,(2):24-36
1吴延河.2004年度山东省地震趋势研究报告.2004
[2]蒋秀娥,陈非比.区域震群与唐山大震[J].地震学报,1983,5(2):145-157Jiang X E,Chen F B.Regional earthquake swarms andthe 1976 Tangshan Earthquake[J].ACTA Seismolo-gica Sinica,1983,5(2):145-157
[3]赵兴兰,李艳顺,华爱军,等.由震群信息熵分析山东及沿海地区的地震危险性[J].地震地磁观测与研究,1992,13(4):182-186Zhao X L,Li Y S,Hua A J,et al.Analyzing earth-quake hazard in Shandong Province and surroundingsby swarm INFORMATION ENTROPY[J].Seismo-logical and Geomagnetic Observation and Research,1992,13(4):182-186
[4]周翠英,侯海峰,华爱军,等.山东及其近海区地震序列类型地理分布特征[J].华北地震科学,2001,13(4):15-27Zhou C Y,Hou H F,Hua A J,et al.The geographicdistribution feature of earthquake sequence type inShandong and its offshore area[J].North ChinaEarthquake Sciences,2001,13(4):15-27
[5]国家地震局科技监测司.《地震学分析预报方法程式指南》[M].北京:地震出版社,1990.25-28Department Of Science&Technology And MonitoringChina Seismological Bureau.The Guide to TheMethod of Earthquake Prediction and Analysis[M].Beijing:Earthquake Press,1990.25-28
[6]陆远忠,李胜乐,邓志辉,等.基于GIS的地震分析预报系统[M].成都:成都地图出版社,2002.117-119Lu Y Z,Li S L,Deng Z H,et al.The System ofEarthquake Prediction and Analysis Basing on GIS[M].Chengdn:Chengdu Atlas Press,2002.117-119
[7]华爱军,刘西林,郑建常,等.华北35°线附近地震活动特征与地震危险性预测[J].东北地震研究,2002,(2):24-36Hua A J,Liu X L,Zheng J C,et al.Seismic activitycharacteristics and risk prediction in northen latitude35°region of North China[J].Seismological Researchof Northeast China,2002,(2):24-36
1吴延河.2004年度山东省地震趋势研究报告.2004
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