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1983年11月7日05时09分,山东菏泽—东明间发生5.9级地震。震前,相距震中约250公里的邳县车夫山中学地震测报点地应力日均值图的变化曲线通过理论分析,出现明显异常。车夫山中学测报点,使用的是邢台产75—1型简易应力仪。仪器应变灵敏度高于10~(-5),应力灵敏度 1gm/cm~2,对破坏性地震(一般大于5级地震)在一定范围内有反应。仪器于1978年3月1日投入使用,1982年11月5日搬进地下室。探头埋在地下室地板下0.6米处,每日目测5次,时间分别是8点,12点,16点,19点,20点。
At 05:09 on November 7, 1983, an earthquake of magnitude 5.9 occurred between Heze and Dongming in Shandong. Before the earthquake, the mean daily stress curve of the Qixian Qifu Shan Middle School earthquake measuring point about 250 km away from the epicenter was analyzed by theoretical analysis, showing obvious abnormalities. Coach Hill Middle School Report points, using the Xingtai production 75-1 simple stress meter. Instrument strain sensitivity higher than 10 ~ (-5), stress sensitivity 1gm / cm ~ 2, for destructive earthquakes (generally greater than 5 earthquakes) in a certain range of response. Instrument in March 1, 1978 put into use, November 5, 1982 moved into the basement. The probe buried in the basement floor 0.6 meters below the ground, visual inspection 5 times a day, time is 8:00, 12:00, 16:00, 19:00, 20:00.