1994年台湾海峡7.3级地震与仑坪台、泉州台地磁变化的关系

英文篇名：Study on geomagnetic variations for Lunping and Quanzhou observatories before and after the M_S7.3 Taiwan Strait earthquake in 1994
中文刊名：华南地震
英文刊名：South China Journal of Seismology
作者：陈伯舫
英文作者：CHEN Po fang (Institute of Geophysics ; CSB ; Beijing 100081 ; China)
中文关键词：地磁观测 ; 地磁静日变化 ; 视深比变化 ; 台湾海峡地震
英文关键词：geomagnetic observation ; quiet-day geomagnetic variation ; time changes in apparent-depth-ratio ; the Taiwan Strait earthquake
出版日期：2001-03-30
机构：中国地震局地球物理研究所!北京100081
年：2001
期：01
出版单位：华南地震

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。
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.

引文

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