【摘要】 地磁月均值的长期变化结果表明 ,1994年台湾海峡 7 3级地震前 4年 ,泉州台与仑坪台的X和Z分量均出现异常。X分量呈现负异常 ;Z分量呈现正异常 ,异常幅度达2 0～ 30nT。另外 ,地震前一年半 ,泉州台与通海台的视深比或仑坪台与通海台的视深比(周期为 2 4h)都出现过先降后升的异常变化。更多还原

【Abstract】 The secular variations of the monthly mean difference between different observatories indicate that significant anomalous changes in the X and Z components for Lunping and Quanzhou observatories appear to be related to the M S 7 3 Taiwan Strait earthquake. The anomalous changes started before 4 years of the occurrence. The anomalous change of the X component appears to be negative, and the anomalous change of the Z component appears to be positive. Those magnitudes of anomalous changes are about 20～30 nT.Besides, the apparent-depth-ratio (for the period of 24 h) between Quanzhou and Tonghai observatories,or Lunping and Tonghai observatories, drops first and then goes up within the duration of 1 5 years before the earthquake occurrence.更多还原