唐山7.8级地震前后地电阻率功率谱异常

ANALYSIS ON ABNORMAL POWER SPECTRUM OF THE EARTH RESISTIVITY AROUND TANGSHAN M_(s) 7.8 EARTHQUAKE

本文对宝坻、昌黎、忠兴庄和青光地电台地电阻率观测值进行了功率谱计算,发现地电阻率在1976年7月28日唐山7.8级地震前后存在功率谱异常。所得结果与地磁垂直分量功率谱在唐山地震前后的异常周期相吻合。

This paper computed the power spectrum of the observatory value of the earth resistivity at Baodi, Changli, Zhongxingzhuang and Qingguang geoelectric stations. It is found that there existed anomaly of power spectrum around the Tangshan M, 7.8 earthquake on July 28, 1976. The results obtained here are consistent with the abnormal period of the power spectrum of geomagnetic vertical component before and after the Tangshan main shock.