广西地区地磁异常与地震关系的研究  

Research on Relationship between Geomagnetic Anomaly and Earthquakes in Guangxi Region

作　　者：阎春恒 孙学军 齐贵华 韦仕根 黄惠宁 向巍 

机构地区：[1]广西壮族自治区地震局,广西南宁530022 [2]广西壮族自治区地震局邕宁地震台,广西南宁530200 [3]广西壮族自治区地震局河池地震台,广西河池547000

出　　处：《地震研究》2015年第4期606-612,共7页Journal of Seismological Research

基　　金：广西科技攻关计划项目(14124004-4-8;12426001);地震科技星火计划项目(XH142003Y);中国地震局"三结合"课题(龙滩水库中等地震前兆特征分析)共同资助

摘　　要：采用空间相关法计算了1987—2013年广西邕宁地震台和河池地震台的地磁Z分量日变化幅度相对海南琼中地震台的空间相关系数，分析了研究时段内空间相关曲线异常变化特征与广西及北部湾海域中强地震的关系。结果表明，广西及北部湾海域中强地震通常发生在邕宁地震台和河池地震台的空间相关曲线同步出现低值异常持续过程中或异常结束后3个月内，且低值异常持续时间超过1个月、异常最小幅值≤0．9。预报效能检验结果显示，该方法对广西地区M≥4．4地震具有较好的映震效果，可为该地区短临地震趋势分析提供定量判据。The spatial-correlation method was applied to calculating the spatial-correlation coefficients of the daily geo- magnetic variation data in Z component at Yongning Seismic and Hechi seismic Station in Guangxi Province rela- tive to the geomagnetic data in Z component at Qiongzhong Seismic station in Hainan Province from 1987 to 2013. Then the relationship between abnormal variation of the spatial-correlation curves and the moderate and strong earthquakes in Guangxi and its adjacent Beibu Gulf was analyzed. The analysis suggests that the moderate and strong earthquakes in Guangxi and its adjacent Beibu Gulf usually occurred on the following conditions ： the spatial-correlation curves appeared simultaneously in the process of low-value anomaly or three months after the anomaly ended, and low-value anomaly lasted more than a month and the minimum amplitude of abnormal value was less than or equal to 0.9 at Yongning Seismic Station and Hechi Seismic Station. The prediction efficiency test proved that the spatial-correlation method, which has a good effect of predicting M≥4.4 earthquakes in Guangxi region, is able to provide quantitative identification for short-term and impending earthquake prediction.

关 键 词：地磁异常 Z分量日变化幅度 空间相关性 震磁关系 广西地区 

分 类 号：P318[天文地球—固体地球物理学]