About twenty humans died as a result of the earthquake. In both regions, sharply defined strike slip faults follow mountain fronts. The high terrains in both locations Basins stand separated from the high local range by a thrust system that occurs along the southern edge of the San Gabriel Mountains, California and south of Ih Bogd, Mongolia. The high terranes in both locations and at the Baga Bogd massif sit at compressional fault jogs or bends in the essentially strike-slip systems. In 1857, a 300 km segment of the San Andreas ruptured, slipping 7-10 m maximally.
Evidence exists for splaying into several oblique fault traces and for thrusting in each case.
The fault along the Pacific-North American plate transpressional margin erupts major earthquakes on100 year recurrence cycles,based on earthquake studies. South of Ih Bogd, massif thrust over alluvial fans form low hills which display 4 m vertical offset. The approximately 50 km 1957 Gurvan bulag thrust rupture length slipped 2-3 m on average over a total area of 15,000 square kilometers. Three other zones of major faulting ruptured in 1957, including both thrust and strike slip components, in areas not previously mapped as faults or with little topographic expression. In the Sierra Madre-Cucamonga fault system, the maximal probable likely earthquake would rupture similarly to the Gurvan bulag.