1946 Ancash earthquake

The 1946 Ancash earthquake in the Andes Mountains of central Peru occurred at 17:43 UTC on November 10. The earthquake had a magnitude of 7.3, and achieved a Mercalli intensity scale rating of XI (Extreme). About 1,400 Peruvians are thought to have died from the event.
Earthquake.
It was triggered by slippage along a normal fault at a depth of ~17.0 km with a magnitude of 6.9-7.3, as suggested by the focal mechanism. The fault was a shallow crustal structure on the South American Plate, as surface ruptures were observed with a maximum offset of 3.5 meters. This event also reactivated several older thrust faults. These faults are part of the Marańón Thrust and Fold Belt, which formed in the Tertiary. The surface rupture from this quake ran for 21 km.
Effects.
Many landslides were triggered by the very strong ground motions which was the reason for the high death toll and destruction. One of these slides completely buried the village of Acobamba in Suytucocha Valley.