Determination of the source parameters of the northeast Lingshan, Guangxi, M6 ¾ earthquake on April 1, 1936

The records of 168 global seismographic stations from 2 to 3 o′clock (UTC) on April 1, 1936 have been collected in order to locate the strong earthquake M6 ¾ occurred in northeast Lingshan of Guangxi. The station readings were grouped and associated based on the macro-epicenter of Lingshan mainshock (22.5°N, 109.4°E) and the initial P wave residuals of the seismic stations. Finally records of thirteen stations were successfully associated to Lingshan mainshock, and phase arrivals of 7--8 stations contributed to the event relocation. The routine location method and model of China National Seismic Network Center and ISCloc have been used to relocate the Lingshan mainshock, and the relocation results show that the distance between the two relocated epicenters is about 47.6 km. By comparison, the routine location method and model of China National Seismic Network Center are more suitable for the data with the poor observational conditions of Lingshan mainshock.