甘-青地区地磁垂直分量加卸载响应比、逐日比分析  

Analysis on Load-unloading Response Ratio and Ratio of Daily Variation Amplitude of Geomagnetic Vertical Component in Gansu and Qinghai Region

作　　者：戴勇[1] 高立新[1] 杨彦明[1] 尹战军[1] 郝美仙[1] 梁莹[1] 陆颍哲 

机构地区：[1]内蒙古自治区地震局,呼和浩特010010 [2]满洲里地震台,内蒙古满洲里021400

出　　处：《华南地震》2015年第3期1-6,共6页South China Journal of Seismology

基　　金：2014年度震情跟踪青年课题(2014020401);中国地震局地震监测;预测;科研三结合课题(150501);测震台网青年骨干培养专项(20150405)联合资助

摘　　要：以甘肃、青海及周边地区（30.5°~41.0°N,94.0°~108.0°E）作为研究区域,采用地磁垂直分量加卸载响应比方法,以及由此演化出的地磁垂直分量逐日比方法,对位于甘-青地区的都兰、山丹、古丰、固原和中卫五个台站地磁数据进行处理。结果显示：1自2008年以来,甘-青地区累计发生5次显著地震,其中4次地震前10个月内,出现过加卸载比成组高值异常,3次地震之前10个月内出现过逐日比成组高值异常;2甘-青地区地磁垂直分量加卸载响应比、逐日比异常判据阈值分别为3.0、2.8。In this paper, Gansu, Qinghai and the surrounding areas（ 30.5° ~41.0° N, 94.0° ~108.0° E） was identified as the study area. The paper processes the geomagnetic vertical component data of Dulan, Shandan,Gufeng, Guyuan and Zhongwei stations located in the study area by using the load-unloading response ratio method and ratio of daily variation amplitude method. The results show that five significant earthquakes have occurred in the Gansu-Qinghai region since 2008, of which, there existed high value anomaly of load-unloading response ratio in 10 months before the 4 earthquakes occurred, and there existed high value anomaly of ratio of daily variation amplitude in 10 months before the 3 earthquakes occurred; anomaly threshold of loadunloading response ratio and ratio of daily variation amplitude of geomagnetic vertical component in Gansu and Qinghai region are 3.0 and 2.8 respectively.

关 键 词：地磁垂直分量 加卸载响应比 逐日比 异常 

分 类 号：P315.7[天文地球—地震学]