昆仑山口西8.1级地震前新疆定点形变异常初析
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摘要
昆仑山口西 8.1级地震发生在新疆形变监测台网的东南 ,距震中 70 0— 1 2 0 0 km范围内有 6台项资料显示出地壳形变前兆异常。分析认为地壳形变异常具有一定的阶段性特征 ,中短期异常多出现在 NS向 ,8.1级地震前 2 0天 EW向出现加速或反向突变 ,临震前 4天重力仪记录到强烈的地脉动异常。这些异常的出现与 2 0 0 0— 2 0 0 1年中国西部地区 3次明显的地壳水平运动在时间上有一定的相关性。
The M8.1 earthquake in the west of the Kunlun Mountain Pass is located at the southeast of the Xinjiang Deformation Monitoring Network, which is 700-1200 km from the epicenter. Six kinds of records in the network showed anomalies before the shock; and the anomalies in different stages had different features. The medium- or short-term anomalies much appeared in NS direction; speeding up or sudden reverse changes appeared in EW direction 20 days before the event; and the strong pulsating movement could be recorded by the gravimeter 4 days before the event. It is thought that the appearance of the anomalies is related with three times of obvious crustal horizontal movements in West China in 2000-2001.
The M8.1 earthquake in the west of the Kunlun Mountain Pass is located at the southeast of the Xinjiang Deformation Monitoring Network, which is 700-1200 km from the epicenter. Six kinds of records in the network showed anomalies before the shock; and the anomalies in different stages had different features. The medium- or short-term anomalies much appeared in NS direction; speeding up or sudden reverse changes appeared in EW direction 20 days before the event; and the strong pulsating movement could be recorded by the gravimeter 4 days before the event. It is thought that the appearance of the anomalies is related with three times of obvious crustal horizontal movements in West China in 2000-2001.
引文
1中国地震局编.2001年11月14日昆仑山口西8.1级大地震简介.震情研究,2001,(4):70—101.
[1]陈文彬,徐锡伟,张志坚,等.2001年11月14日青新交界MS8.1地震地表破裂带的初步调查[J].西北地震学报,2001,23(4):313—317.
[2]沈军,尹光华,赵瑞斌.新疆青海交界东昆仑山8.1级地震构造背景初探[J].内陆地震,2002,16(1):1—7.
[3]陈益惠,雷雨田,朱涵云,等.重力仪高频信息和地脉动的观测研究[J].地球物理学报,1988,31(5):527—539.
[4]赵根模,杨港生,陈化然.寂静的前震与地震预测[J].地震,2001,21(1):69—77.
[5]BonafedeM,BoschiE,DragoniM.缓慢震源过程的动力学模式[A].见:金森博雄.地震观测理论和解释[C].柳百棋译.北京:地震出版社,1992.209—218.
[6]顾国华,申旭辉,王敏,等.中国大陆现今地壳水平运动基本特征[J].地震学报,2001,23(4):362—369.
[1]陈文彬,徐锡伟,张志坚,等.2001年11月14日青新交界MS8.1地震地表破裂带的初步调查[J].西北地震学报,2001,23(4):313—317.
[2]沈军,尹光华,赵瑞斌.新疆青海交界东昆仑山8.1级地震构造背景初探[J].内陆地震,2002,16(1):1—7.
[3]陈益惠,雷雨田,朱涵云,等.重力仪高频信息和地脉动的观测研究[J].地球物理学报,1988,31(5):527—539.
[4]赵根模,杨港生,陈化然.寂静的前震与地震预测[J].地震,2001,21(1):69—77.
[5]BonafedeM,BoschiE,DragoniM.缓慢震源过程的动力学模式[A].见:金森博雄.地震观测理论和解释[C].柳百棋译.北京:地震出版社,1992.209—218.
[6]顾国华,申旭辉,王敏,等.中国大陆现今地壳水平运动基本特征[J].地震学报,2001,23(4):362—369.
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