The 1931 Fuyun earthquake ( ) occurred on August 10, 1931 at 21:18 UTC.^[1] The epicenter was near Fuyun County of northern Xinjiang, China. It was a M_w 8.0 earthquake^[2] and had a surface rupture of 171 km^[3] with a maximal horizontal displacement of 14 m^[4] along the Koktokay-Ertai fault zone ( - ).^[5] The Koktokay-Ertai fault has a slip rate of 4 2 mm per year.^[6] The rupture of this earthquake was caused by right-lateral strike-slip movement with normal component.^[7] The rupture is well preserved and becomes one of the main features of the Koktokay National Geopark ( ) located in Koktokay.^[8]

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