2008年8月30日和静M_S5.6地震序列及震前部分测震学异常分析
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摘要
简要介绍了2008年8月30日新疆和静MS5.6地震的基本参数、震源机制解、地震序列特征和局部构造应力场等,分析了地震前震源区周围及相关构造区域出现的中、短期地震活动异常特征。结果显示,该序列为主-余型,余震活动呈间歇式,衰减迅速,震源断错性质为走滑型。震前震源区东侧存在长时间4级地震平静、3级地震围空及多台地震波振幅比的异常等现象,同时在地震发生前1~3个月出现了短期异常,表现为振幅比异常的回返、空区瓦解和地震窗的异常。依据多种异常变化,在震前对该地震做出了三要素准确的短期预报。
The author introduces briefly the basic parameters,focal mechanism solution,sequence character and local tectonic stress field of Hejing MS5.6 earthquake on August 30,2008 etc.,and analyzes the middle and short term seismic anomaly characteristics in the source region and its surroundings and related tectonic belt before Hejing MS5.6 earthquake.The result shows that MS5.6 earthquake sequence is main-aftershock type,and the aftershock activity is intermittent and attenuates rapidly,and the focal dislocation is strike-slip type.There exists the long quiescence of MS4 earthquakes,gap of MS3 earthquakes and multi-stations amplitude ratio anomalies in the east of source region before the earthquake.At the same time,there are short-term anomalies for one to three months before the earthquake,i.e.,amplitude ratio anomaly rising,gap broken and seismic window anomaly.According to multi-anomaly variation,we made the accurate forecast on the seismic three factors before the earthquake.
The author introduces briefly the basic parameters,focal mechanism solution,sequence character and local tectonic stress field of Hejing MS5.6 earthquake on August 30,2008 etc.,and analyzes the middle and short term seismic anomaly characteristics in the source region and its surroundings and related tectonic belt before Hejing MS5.6 earthquake.The result shows that MS5.6 earthquake sequence is main-aftershock type,and the aftershock activity is intermittent and attenuates rapidly,and the focal dislocation is strike-slip type.There exists the long quiescence of MS4 earthquakes,gap of MS3 earthquakes and multi-stations amplitude ratio anomalies in the east of source region before the earthquake.At the same time,there are short-term anomalies for one to three months before the earthquake,i.e.,amplitude ratio anomaly rising,gap broken and seismic window anomaly.According to multi-anomaly variation,we made the accurate forecast on the seismic three factors before the earthquake.
引文
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[2]姜秀娥,张国民,单锦芬,等.“地震窗”在地震预报中的应用[C]//地震学专辑.北京:学术书刊出版社,1989:296-311.
[3]敖雪明,王桂岭,黄克强,等.相关地震预报方法的研究[C]//地震学专辑.北京:学术书刊出版社,1989:268-295.
[4]李莹甄,曲延军.伽师强震群活动期间地震窗异常特征研究[J].西北地震学报,2000,22(4):368-375.
[5]冯德益,顾瑾平,李清河.含裂隙介质中地震波传播的振幅异常[J].地震学报,1983,5(2):158-168.
[6]冯德益.近地震S、P波振幅比异常与地震预报[J].地球物理学报,1974,17(3):140-154.
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