2013年甘肃岷县漳县MS6.6地震前甘东南地区前兆异常分析*

(1.甘肃省地震局,甘肃 兰州 730000; 2.丹江口市地震局,湖北 丹江口 442700)

岷县漳县MS6.6地震; 前兆异常; 地下流体; 地电阻率; 地形变; 甘东南地区

Analysis on the Some Typical Precursory Anomalies before Minxian-Zhangxian MS6.6 Earthquake in Southeast Area of Gansu Province in 2013
ZENG Wen-hao1,YANG Xing-yue1,SHI Ji-ping1,HUANG Cheng-cheng2,SONG Ting1

(1.Earthquake Administration of Gansu Province,Lanzhou 730000,Gansu,China)(2.Earthquake Administration of Danjiangkou Multiply,Danjiangkou 442700,Hubei,China)

Minxian-Zhangxian MS6.6 earthquake; precursory anomaly; underground fluid; geoelctrical resistivity; ground deformation; southeast area of Gansu Province

备注

通过分析甘东南地区的前兆资料,认为2013年7月22日岷县漳县MS6.6地震前震中距300 km内甘肃部分前兆资料有明显的中短期异常及典型的短临异常。用从属函数法定量提取了水氡和水位资料中短期异常,分析了异常特征,并对岷县漳县MS6.6地震前水氡、水位、水温、地电阻率及形变资料的异常特征进行了重点分析,发现地震前甘东南地区的几项地形变资料出现了明显的中短期异常,部分水氡、水位、水温和地电阻率资料存在明显的短临异常。

By analyzing the precursory data in the southeast area of Gansu Province before Minxian-Zhangxian MS6.6 earthquake on Jul.22,2013,we found that there appeared the obvious mid-short anomalies and typical short impending anomalies in the precursory data in the area of 300 km from the epicenter.Then we quantitatively extracted the mid-short term anomalies of water radon and water level by subordinate function method,and took a brief analysis of anomalies characteristics of it.Then we focused on analyzing the anomalies characteristics of water radon,water level,water temperature,geoelctrical resistivity and deformation data before Minxian-Zhangxian MS6.6 earthquake,and obtained that there exited obvious mid-short impending anomalies in several ground deformation data,and the obvious short impending anomalies in some data of water radon,water level,water temperature,geoelctrical resistivity in the southeast area of Gansu Province.