摘要
通过对浙、沪、苏邻近 4个地磁观测点的近十年的资料 ,及邻近区域 1 0个地震进行了每日Z分量日变幅加卸载响应比随时间变化和响应比月均值的相关研究。结果表明 :加卸载响应比阈值 P0 ( Z)和响应比月均值 PM( Z)的大小与地震的震级、震中距及异常出现的早晚并非完全呈线性相关 ;当响应比值大于某一阈值时 ,有可能发生一定震级的地震 ;按该方法结果综合分析 ,截止 1 998年 9月底 ,未来 1年左右的时间内在该研究区域或更大范围 (含台湾区域 )有可能发生 6级左右的地震。
We calculated and analyzed about ten years′data on geomagnetic loading- unloading response ratio value P(Z) from magnetic stations in Zhejiang,Shanghai and Jiangsu Provinces,and studied the relation of ten earthquakes which occurred in the three provinces and theirvicinity and changes ofthe P(Z) and its monthly average value PM(Z) . The results show that it is not a complete linear correlation between the threshold value P0 (Z) or PM(Z) and the seismic magnitude or the epicentral distance or the occurrence time of anomalous P(Z) and PM(Z) .When P(Z)≥ P0 (Z) at a station an earthquake maybe occur nearby. On the basis of synthetic analysis by this method,a strong earthquake with MS≥ 6.0 may occur in the research region or more largely area (including Taiwan Region) within one year,by the end of September1 998.This method can be used as a new routine tool for judgementof the medium-shortand short-term and imminent seismic tendency.
出处
《地震》
CSCD
北大核心
2000年第2期53-60,共8页
Earthquake
基金
浙江省重点科研资助项目!( 961 1 0 3 0 88)
关键词
地磁
加卸载
响应比
地震前兆
对应关系
日变幅
Geomagnetism
Daily range
Loading-unloading response ratio
Threshold value
