格尔木台地磁短周期变化与周围地震的对应关系

The correponding relationship between the short period geomagnetic variations and the surrounding enrthquakes at Seismic Statio of Golmud

计算分析了位于青藏高原东北部的格尔木地磁台１９８７年１月至１９９７年３月的地磁周期Ｔ＝９～２００ｍｉｎ的复转换函数Ａ的模｜Ａ｜、Ｂ的模｜Ｂ｜、总方差σｚ的帕金森矢量或韦氏矢量，并将其与同期格尔木周围３５０ｋｍ范围内ＭＳ≥５．０的８个地震进行了对比研究，发现周期为９，７５ｍｉｎ的｜Ａ｜、周期为９ｍｉｎ的｜Ｂ｜在震前有明显异常，总方差σｚ亦有一定的对应效果，帕金森或韦氏矢量在震前指向震中位置。

In this paper,the consecutive monthly variations of complex transfer function moduli |A| and |B| of geomagnetic field in the periods of T =9～200 min,the total variance σ z ,the magnetic azimuth α p and the Parkinson or Wiess vector from Jan.1987 to Mar.1997 at Seismic Station of Golmud,which is located in the northeast of Qinghai Plateau,were calculated and analyzed.They were compared and studied with eight earthquakes( M S≥5 0)occurred at the same time within the range of 350 km around the station.It was found that |A| of period 9,75 min and |B| of 9 min were strikingly anomalous prior to the earthquakes.The total variance σ z and the local earthquakes also have a certain corresponding effect.The Parkinson or Wiess vector pointed to the epicenters before these earthquakes.