昆仑山口西M_S8.1地震前跨断层位移资料异常特征

Across Fault Displacement Measuring Data Anomaly Prior to the West of Kunlun Pass Earthquake M_S=8.1 on November 14, 2001

一、引言 2001年11月14日发生在新疆—青海昆仑山口西的8.1级地震,是本世纪以来中国大陆发生的最大的一次地震,因该震源区附近无任何观测手段,为无监测能力区。但震后我们发现在8.1级地震所波及范围内的各观测手段都有不同程度的长、中、短期及震时异常。在震源区东部的四川、甘肃、宁夏等省跨断层位移观测点均出现不同程度的异常,但当时却未能用这些异常预测出8.1级地震的发震区。

By using the mobile across fault displacement measuring data obtained in Sichuan,Gansu,and Ningxia areas,we have analyzed the relevant fault activities features prior to the west of Kunlun Pass earthquake M_S=8.1 on November 14,2001.The results show that there have had a large group of fault displacements.Their features are as fellows:1)The fault appeared heritage activity;2)The heritage activity accelerated;3)The active rate increased.Basically,such anomaly area might represent the active tectonic background of the great shock.