1622 North Guyuan earthquake
The 1622 North Guyuan earthquake struck Ningxia, China on 25 October with a Richter magnitude of 7.0 and a maximum Mercalli intensity of X. It was the only recorded big earthquake in western China for 148 years, between 1561 and 1709. The earthquake occurred on the "rake of the Zhongwei-Tongxin fault", with a mid-seismogenic depth of about.
