民乐—山丹地震地下流体异常场特征及其成因分析

Characteristics of Subsurface Fluid Anomaly Field and Its Genesis before Minle-Shandan Earthquake

摘要:

介绍了2003年10月25日民乐-山丹MS6.1地震前地下流体异常场的时空特征及其演化,分析了地下流体异常场的成因.研究结果表明,民乐-山丹地震地下流体前兆场具有异常时间长、异常项次多、异常范围大的特征,其原因是受青藏块体整体构造和地震活动水平增强以及2001年11月14日昆仑山口西8.1地震的影响.

Abstract:

The temporal and spatial characteristics of the subsurface fluid anomalous field and its evolution before Minle-Shandan earthquake on Oct. 25, 2003,are presented. The causing of anomalous field of subsurface fluid is analyzed. The research results show that the characteristics of subsurface fluid precursory field before Minle-Shandan earthquake are long anomalous period, much anomalies and large anomalous area. The reason for these characteristics is the increasing of tectonic and seismic activities of the whole Qinghai-Tibet Plateau and the influencing of west to Kunlunshan pass Ms8.1 earthquake on November 14 of 2001.