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宣化老汉山裂缝塌陷是中国人民解放军炮兵指挥学院学员孙忠厚在1986年5月1日登山时偶然发现的。上报有关单位后引起了许多人的关注,国家地震局领导为此做过批示,中央电视台12月17日播出了此条新闻。我们于12月中旬到现场进行了考察,现提出一些初步看法。老汉山位于张家口市宣化城北偏西3公里处,张—宣盆地东北边缘,距怀安—宣化活动断裂北2公里,由侏罗系、震旦亚界地层组成—倒转背斜,山体走向和构造线方向一致均为北西西向。老汉山高程海拔853.6米,相对高差100多米。北坡较陡,见有悬崖峭壁,坡角大于40度,南坡较缓,坡角20度左右。北坡山脚出露岭沟组地层,本
The crack collapse of Xuanhuashan Mountain was accidentally discovered by Sun Zhonghou, a member of Artillery Command Academy of the Chinese People’s Liberation Army, when climbing on May 1, 1986. Released to the unit after aroused the concern of many people, the leadership of the State Seismological Bureau has done this instruction, CCTV broadcast on December 17 this news. We visited the scene in mid-December and now come up with some preliminary observations. Laohan Mountain is located 3 km north of Xuanhua City, Zhangjiakou City, northeast margin of Zhang-Xuan basin, 2 km north of Huai’an-Xuanhua activity fault, composed of Jurassic and Sinian strata - reverse anticline, The same direction of tectonic line is NWW. Old Han Shan elevation of 853.6 meters above sea level, the relative elevation of 100 meters. Steep northern slope, see cliffs, slope angle greater than 40 degrees, the south slope is slow, slope angle of about 20 degrees. The north slope of the mountain out of Luolinggou formation, the