摘要
应用磁通门磁力仪地磁垂直Z分量数据,研究重庆地区(29.0°-32.0°N,105.5°-110.8°E)范围内M_L≥4.5地震,应用加卸载响应比、日变幅逐日比方法计算它们之间的对应关系。结果表明:M_L≥4.5地震发生前,排除非异常超阈值,在同一天多次出现了至少两个地磁台地磁垂直Z分量加卸载响应比和日变幅逐日比超过阀值异常现象。认为加卸载响应比及日变幅逐日比方法对重庆及邻近地区相应震级有较好的映震效果,还发现同场不同型号多套磁通门的阈值异常变化情况。
In this paper,the vertical Z component data of fluxgate magnetometer are used to calculate the corresponding relationship between earthquakes of ML≥4.5 in Chongqing area(29.0°-32.0°N,105.5°-110.8°E). The results show that before the occurrence of earthquakes with magnitude ML≥4.5,the anomalous phenomena of loading-unloading response ratio and daily variation amplitude ratio exceeding the threshold value occurs many times for at least two geomagnetic stations on the same day. It is considered that the comparison method with loading-unloading response ratio and daily variation amplitude can reflect the corresponding magnitudes in Chongqing and its adjacent areas better.The abnormal variation of threshold values of multiple sets of fluxgates in different models are also found in the same field.
作者
尹忆寒
谢松桦
高见
姜维松
Yin Yihan;Xie Songhua;Gao Jian;Jiang Weisong(Chongqing Earthquake Agency,Chongqing 401147,China)
出处
《国际地震动态》
2019年第10期45-53,共9页
Recent Developments in World Seismology
基金
重庆市地震局科研课题资助
关键词
同场地磁
加卸载响应比
日变幅逐日比
异常指标
地震预报
same field geomagnetism
loading and unloading response ratio
daily variation ratio
anomaly index
earthquake prediction
