运用小波-超限率方法提取霍山M_(L)4.7级地震体应变异常

Anomaly Extracting of Volumetric Strain of the Huoshan M_(L)4.7 Earthquake by Means of Wavelet-Overrun Rate Analysis

以安徽省钻孔体应变观测数据为基础,应用小波分析法对体应变观测数据进行了细节分析,选择小波分析结果进行超限率计算,获得了合肥、嘉山、滁州和六安台的强度超限率和数量超限率。并将超限率变化与2012年以来安徽省发生的M_(L)4.0级以上地震进行对比分析发现,2014年4月20日霍山M_(L)4.7级地震前合肥、六安、滁州和嘉山台体应变小波分析结果的强度超限率和数量超限率都有一定程度的异常变化。

Base on the observation data of volumetric strain in Anhui province,this paper analyzes these original data in detail by using the wavelet analysis,selects the wavelet analysis results to calculate the overrun rate,and obtains the intensity overrun rate and quantity overrun rate of Hefei,Jiashan,Chuzhou and Lu'an Seismic Stations.By comparing the overrun rate changes with the earthquakes with M_(L)≥4.0 in Anhui Province since 2012,it is found that there are some anomalous changes in the intensity overrun rate and the quantity overrun rate before the Huoshan M_(L) 4.7 earthquake on April 20th,2014 at Hefei,Jiashan,Chuzhou and Lu'an Seismic Station.