1920 Haiyuan earthquake (Chinese: 海原大地震; pinyin: Hǎiyuán dà dìzhèn), was an earthquake that occurred on December 16, 1920. The epicenter was 36°30′N 105°42′E / 36.50°N 105.70°E, in Haiyuan County, Ningxia Province, Republic of China. It was also called the 1920 Gansu earthquake [1] because Ningxia was a part of Gansu Province when the earthquake occurred.