1993年12月31日北黄海Ms4．5级地震的地倾斜异常分析

ANALYSIS ON GROUND TILT ANOMALY OF THE NORTH YELLOW SEA EARTHQUAKE (Ms=4.5) ON DECEMBER 31,1993

本文针对１９９３年９月中旬以来烟台石英倾斜仪ＳＮ向出现的短期异常运用实用化方法对观测数据进行了全面的分析处理。其结果给出，烟台石英倾斜仪异常与１９９３年１２月３１日０时２９分在东经１２２°４５’，北纬３８°１０’的Ｍｓ４．５级地震有关。

In the light of short-term anomaly occurred on SN direction of quartz tiltmeter at Yantai station since the middle ten days of September, 1993, the authors made a comprehensive analysis of the observation data using practical method. The results show that the anomaly of quartz tilt meter at Yantai station was related to the earthquake of magnitude Ms 4.5 occurred in 122°45' E, 38°10' N, at 0: 29 on December 31, 1993.