昆仑山口西8.1级地震前的地震活动图像演变特征
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摘要
昆仑山口西8.1级地震的孕育过程以地震空间图像的递进演变为特征,可分为三个阶段:1959年以来M≥6地震围成背景空区的阶段,1994年以来M≥5地震围成孕震空区的阶段和震前4个月的"逼近地震空区"阶段.在孕震空区的末期,青藏块体及中国西部出现了1～2年的地震条带;伴随逼近地震空区的形成,还出现了较大范围的小震平静.最后讨论了中国大陆西部8级地震的时空演变特征.
Seismogenic process of west to Kunlun Mountain Pass MS8.1 earthquake is consists of three evolutionary stages for seismicity pattern.The first stage is background gap formed by MS≥6 earthquake from 1959;the second stage is pregnant gap formed by MS≥5 earthquakes from in 1994, and the third stage,"imminent earthquake gap" lasts 4 months before the MS8.1 earthquake.At the later period of the pregnant gap,seismic bands in 1～2 years appeared in Qinghai-Xizang block and western China. Along with the formation of the "imminent earthquake gap", no small earthquake occurred in the region.The timespace evolutionary feature of MS8 earthquakes in western China is discussed at the end.
Seismogenic process of west to Kunlun Mountain Pass MS8.1 earthquake is consists of three evolutionary stages for seismicity pattern.The first stage is background gap formed by MS≥6 earthquake from 1959;the second stage is pregnant gap formed by MS≥5 earthquakes from in 1994, and the third stage,"imminent earthquake gap" lasts 4 months before the MS8.1 earthquake.At the later period of the pregnant gap,seismic bands in 1～2 years appeared in Qinghai-Xizang block and western China. Along with the formation of the "imminent earthquake gap", no small earthquake occurred in the region.The timespace evolutionary feature of MS8 earthquakes in western China is discussed at the end.
引文
[1] 陆远忠,沈建文,宋俊高,等.地震空区与"逼近地震"[J].地震学报,1982,4(4):327—325.
[2] 陆远忠,王炜,沈建文,等.地震空区与逼近地震(续)[J].地震学报,1982,5(2):129—143.
[3] 梅世蓉,冯德益,等.中国地震预报概论[M].北京:地震出版社,1993.49—65.
[4] 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,1990.7—14.
[2] 陆远忠,王炜,沈建文,等.地震空区与逼近地震(续)[J].地震学报,1982,5(2):129—143.
[3] 梅世蓉,冯德益,等.中国地震预报概论[M].北京:地震出版社,1993.49—65.
[4] 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,1990.7—14.
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