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一、资料1983年11月7日5时9分在山东省菏泽附近(北纬35°14＇,东经115°17＇)发生了5.9级地震。这次地震发生在华北平原南部聊考断裂带上,距震中200公里范围内的长清、辉县、徐州三个应力台震前都不同程度地出现了较明显的异常变化。如图1。1.短期异常变化长清台:位于聊考断裂带东侧约45公里,震中距190公里,该台电感地应力于1975年9月开始观测,几年来资料基本连续可靠。深孔三个受力元件变化较平稳,浅孔受力元件观测曲线以一定斜率缓慢上升,年变特征呈现夏季高、冬季低。1983年8月初开始,深孔、浅孔六个元件观测曲线都偏离正常变化背
I. Information At 05:07 on November 7, 1983, a magnitude 5.9 earthquake occurred near Heze, Shandong Province (latitude 35o 14 ’, longitude 115o 17’ east). The earthquake occurred in the Chatao fault zone in the southern part of the North China Plain, with obvious abnormal changes to varying degrees before the three stress stations of Changqing, Huixian and Xuzhou within 200 km from the epicenter. Changqing Terrace: Located about 45 km to the east of the Chatou fault zone and 190 km from the epicenter, the geostress of this station began to be observed in September 1975, and the data have been basically continuous and reliable over the past few years. The changes of the three stress components in the deep hole are relatively stable. The observation curve of the shallow hole force element slowly rises with a certain slope. The annual variation shows the summer high and the winter low. Beginning in early August 1983, deep hole, shallow hole six elements deviate from the normal curve of the back