摘要
通过利用空间线性度方法，分析处理地磁场前兆观测资料，并从“场”的角度综合计算多台站的地磁场观测资料，确立地磁基本场的统一信息量─—空间线性度地分析处理华北地区多个台站1975～1994年的地磁场前兆观测资料。结果表明，中强地震之前约1a左右的时间内，空间线性度α可能出现明显的下降异常，有些在临震前回升，因此地磁场空间线性度α有可能作为中强地震前兆预报的指标。
By using the spatial linearity method, the geomagnetic precursory data have been an-alysed and processed. After calculating the multistation geomagnetic data, the unified in-formation value-spatial linearity (a) can be determined in geomagnetic field. Forexample, the spatial linearity method has been applied to the processing of multistationgeomagnetic data in North China from l975 to 1994. The results show that spatial linearityvalue displays the descending anomaly about one year before the occurrence moderatelystrong earthquakes. The spatia1 (a) of geomagnetic precursory field might be the short-and medium-term prediction index of the moderately strong earthquakes.
出处
《地震》
CSCD
北大核心
1997年第3期271-276,共6页
Earthquake
基金
地震联合基金!94138
关键词
地震综合预报
地磁场
地磁异常
地磁观测数据
Synthetic prediction of earthquake, Geomagnetic field, Geomagnetic vertical component, Geomagnetic anomaly
