The 1622 North Guyuan earthquake struck Ningxia, China on 25 October with a magnitude of 7.0 Ms and a maximum Mercalli intensity of X (Extreme). 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 15 kilometres (9.3 mi).
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