The Shunyi earthquake swarm, the Yingxian and the Liangcheng earthquake swarms, and the Hunyuan earthquake swarm occurred in the place where Shanxi, Hebei Provinces and Inner Mongolia Autonomous Region meet and respectively in December 1996, November 1997 and December1997, which might mean the coming Zhangbei earthquake.

There were Taoists and monks who claimed that Beiyue Hengshan was in Hunyuan(浑源)since Jin-Yuan Dynasty.

Water quality assessment in upstream Hun River by aquatic-bios investigation;