1992年1月23日黄海Ms5.3级地震前青岛地电阻率的短临异常变化

１９９２年１月２３日黄海发生了Ｍｓ５．３级地震，震中离青岛市１１８ｋｍ。青岛市地阻率有三个分向，东西向、南北向和垂直向。用多元回归分析消除地下水位、温度、气压和降雨对地电阻率的影响后，在这次地震前，三个分向都有明显变化，１９９２年１月１１日三个分向同步下降。其中南北向和东西向自１９９１年１２初开始，波动幅度较以前变大，并同时在１９９２年１月１１日到１９日形成一个下降的凹兜，所不同的是东西向下降的幅

SHORT-TERM AND IMMINENT ANOMALIES OF EARTH RESISTIVITY IN QINGDAO BEFORE YELLOW SEA EARTHQUAKE MS5.3 ON JANUARY 23, 1992

An earthquake with Ms 5 3 occurred in Yellow Sea on January 23, 1992, which was 118 km away from Qingdao City Earth resistivity in Qingdao has three branch directions, which include east west, north south and vertical directions The earth resistivity had changed obviously before Yellow Sea earthquake after removing interference factors, such as groundwater level, temperature, barometric pressure and rain fall The three branches had synchronously decreased on January 11, 1992 The fluctuation amplitudes of the earth resistivity in east west and north south had been bigger than that of the former since early in Dec 1991 They had formed a decreased hollow from Jan 11 to 19, 1992 It is unlike that the decreased amplitude in east west is over twice as big as that in north south It is possible that because the epicenter is located in the east of the observation station The amplitude change in the vertical direction is the least It can be seen from differenct curves of observed values of earth resistivity in Qingdao that they all had overstepped twice mean square error from 11 to 12 days before the earthquake The anomalies in three directions had appeared more synchronously After removing tendency and disturbances the short term and imminent anomalies before the earthquake are more obvious