青藏高原6.0～6.9级地震前M_L≥4地震平静异常研究
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摘要
对1975年以来青藏高原36个(25组)6.0~6.9级强震前ML≥4地震活动图像演化特征跟踪分析,发现92%的地震前震源区及外围出现清晰的ML≥4地震平静区。平静面积多在1×106km2内,平静时段多集中在200~700 d,92%的地震发生在平静区内部。从地震预测角度认为,ML≥4地震大面积平静为青藏高原6.0~6.9级地震前一个具有鲜明特征的共性异常,它可以为青藏高原6级地震发生地点的判定、场的追踪提供依据。
Tracing and analyzing the seismic activity evolution characteristic of ML≥4 earthquakes before 36( 25groups) M6.0 ~ 6.9 strong earthquakes in Qinghai-Tibetan Plateau since 1975,we found that there appeared the clear seismic quiescence area of ML≥4 earthquakes in epicenter and its periphery before 92% earthquakes.The area of seismic quiet was less than 1 × 106km2,the quiet period focused on 200 ~ 700 d,and the 92%earthquakes occurred inside the seismic quiet area.On the aspect of earthquake prediction,we considered that the large area of seismic quiet of ML≥4 earthquakes was the common anomaly with distinct characteristic before M6.0 ~ 6.9 earthquakes in Qinghai-Tibetan Plateau,which could be used to judge the location of M6.0 earthquake in Qinghai-Tibetan Plateau,and provide the basis of field tracing.
Tracing and analyzing the seismic activity evolution characteristic of ML≥4 earthquakes before 36( 25groups) M6.0 ~ 6.9 strong earthquakes in Qinghai-Tibetan Plateau since 1975,we found that there appeared the clear seismic quiescence area of ML≥4 earthquakes in epicenter and its periphery before 92% earthquakes.The area of seismic quiet was less than 1 × 106km2,the quiet period focused on 200 ~ 700 d,and the 92%earthquakes occurred inside the seismic quiet area.On the aspect of earthquake prediction,we considered that the large area of seismic quiet of ML≥4 earthquakes was the common anomaly with distinct characteristic before M6.0 ~ 6.9 earthquakes in Qinghai-Tibetan Plateau,which could be used to judge the location of M6.0 earthquake in Qinghai-Tibetan Plateau,and provide the basis of field tracing.
引文
陈立德,付虹.2003.地震预报基础与实践[M].北京:地震出版社,156-207.
陈玉华,姚家骏.2013.中国大陆7级以上地震钱地震空区演化过程分析[J].地震研究,36(4):418-426.
戴志阳,陈宇卫,傅容珊,等.2006.前兆性地震平静研究[J].地球物理学进展,21(1):18-24.
马玉虎,杜鹃.2012.青藏块体强震活动状态分析[J].地震地磁观测与研究,30(1):7-11.
宋俊高,王炜,潘坚云,等.1994.地震异常平静用于短期预报的应用[J].地震,14(1):48-561.
Habermann R.E..1981.Stalking the Mature Seismic Gap[M].In Earthquake prediction(eds.Simpson D W and Richards P G),Maurice Ewing Series(AGU4),29-42.
陈玉华,姚家骏.2013.中国大陆7级以上地震钱地震空区演化过程分析[J].地震研究,36(4):418-426.
戴志阳,陈宇卫,傅容珊,等.2006.前兆性地震平静研究[J].地球物理学进展,21(1):18-24.
马玉虎,杜鹃.2012.青藏块体强震活动状态分析[J].地震地磁观测与研究,30(1):7-11.
宋俊高,王炜,潘坚云,等.1994.地震异常平静用于短期预报的应用[J].地震,14(1):48-561.
Habermann R.E..1981.Stalking the Mature Seismic Gap[M].In Earthquake prediction(eds.Simpson D W and Richards P G),Maurice Ewing Series(AGU4),29-42.
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