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一概况 1983.11.7 山东省菏泽县附近发生5.9级地震,震前一些前兆观测仪器记录到某些异常变化。国家地震局地震地质大队、中国科学院力学研究所联合研制的体积式应变仪于1983年6月23日在徐州台(北纬34°14′,东经117°09′)坑道内安装,坑道底部海拔高程65米。坑道口至埋设仪器点距离约350米,坑顶岩石被复约60米,山体走向与岩体走向近于一致,约北东20°左右,岩层为寒武系中统厚层灰岩,结构完整,裂隙不发育,倾角陡立,约70°左右,在坑道底部的垂直钻孔深30米,体积应变仪的探头就装在钻孔底部。坑道内长年温差小于1℃,看不出温度的日变化,湿度保持在84—90％,较稳定。
An Overview 1983.11.7 A magnitude 5.9 earthquake occurred near Heze County, Shandong Province. Some precursory observation instruments recorded some abnormal changes before the earthquake. Volumetric strain gauges jointly developed by the Seismological and Geological Brigade of the State Seismological Bureau and the Institute of Mechanics of the Chinese Academy of Sciences were installed on the tunnel at Xuzhoutai (latitude 34o 14 ’north latitude, 117o 09’ east longitude) on June 23, 1983, and the bottom elevation of the tunnel 65 meters. The distance between the trenches and the buried instrument is about 350 meters, and the pit top rock is reconstructed about 60 meters. The direction of the mountain body is close to that of the rock mass. About 20 ° North-east, the rock strata are thick Cambrian limestone, Complete, the fracture is not developed, the steep slope, about 70 °, vertical drilling at the bottom of the channel 30 meters deep, the volume of the strain gauge probe mounted on the bottom of the drill. Long years of tunnel temperature difference is less than 1 ℃, do not see the diurnal variation of temperature, humidity maintained at 84-90%, more stable.