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1981年8月13日11时01分内蒙丰镇发生Ms5.8级地震。震前河北省张家口地区的万全井、山西省大同市的217井和田村D_4井水位均出现明显的异常变化(图1)一、万全井水位异常变化万全井位于万全县黄家堡城西河西侧高河漫滩上,构造上处于万全盆地西缘断层带上,距震中113公里,井深217.3米。35米以上为第四系冲洪积砂砾石层。35米以下为上侏罗系南天门组。其上部为泥页岩、页岩夹砂岩及煤层。下部为石英斑岩夹断层角砾岩。观测段深度为171.37米-217.2米,含水层岩性为石英斑岩破碎带,属裂隙承压水。由于水头高不能观测静水位,采用泄流的方式进行动水位观测,使用SW-40型自
At 13:01 on August 13, 1981, an Ms5.8 earthquake struck Fengzhen in Inner Mongolia. There was an obvious anomaly change in Wankuang well in Zhangjiakou area of Hebei province and Datang 217 well in Datong city of Shanxi Province (Figure 1) The side of the river floodplain, the structure is located in the western margin of the Wanquan basin fault belt, 113 km from the epicenter, well depth 217.3 meters. 35 meters above the Quaternary alluvial gravel layer. 35 meters below the Nantun door on the Jurassic. The upper part is mud shale, shale sandstone and coal seam. The lower part is quartz porphyry-clamped fault breccia. The observation section has a depth of 171.37 m -217.2 m. The lithology of the aquifer is quartz porphyritic fracture zone, which belongs to fractured confined water. As the water head can not observe the hydrostatic level, the use of drainage methods for dynamic water level observation, the use of SW-40 since