Study on geomagnetic variations for Lunping and Quanzhou observatories before and after the MS 7.3 Taiwan Str ait earthquake in 1994
CHEN Po-fang
Abstract：The secular variations of the monthly-mean-differ ence between different observatories indicate that significant anomalous changes in the X and Z components for Lunping and Q uanzhou observatories appear to b e related to the MS 7.3 Taiwan Strait earthquake. The anomalo us 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 n T.Besides, the apparent-depth-ratio (for the period of 24 h) between Quanzho u and Tonghai observatories,or Lunping and Tonghai observatories, drops firs t and then goes up within the duration of 1.5 years before the earthquake occur rence.
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Publication Date：2001-01-01
Pages：5( 1-5 )