1679年三河-平谷8级地震地表断层陡坎的GPS测量

GPS Survey of the Surface Fault Scarp of 1679 Sanhe-Pinggu M8 Earthquake

1679年的三河-平谷8级大地震,在三河—平谷地区留下了良好的地貌陡坎,应用高精度GPSRTK测量技术对陡坎的测量显示:断块从大柳店到蒋里村段均有展布,整体走向为北东40°～50°,长度不小于30km,位于东柳河屯至东兴庄段,陡坎高度为2～3m,往两侧高度变小。横穿泃河及南大河的测线剖面显示河流左岸较右岸高,河谷不对性明显,说明断层可能顺河道发育。

The 1679 Sanhe-Pinggu MS8 Earthquake left a well preserved fault scarp.The high-precision GPS RTK measurement of the scarp shows that the fault extends from Daliudian to Jianglicun with a length of more than 30 km,the fault strike is 40°~50°,Between Dongliuhetun and Dongxingzhuang,the vertical height of the fault scarp is basically 2~3m and decreases to both sides of the scarp.The cross sections of the Juhe and Nandahe rivers show that the left bank of the river is higher than the right one,the valley is asymmetrical obviously,which means that the Xiadian fault develops in the same direction as the river.