According to the United States Geological Survey Scrutiny ( USGS ) the cities experiencing Perception_active the strongest shaking—VIII ( `` Severe '' ) on the Mercalli intensity scale ( MM ) —were Concepción , Arauco and Coronel .

The 1960 Concepción earthquakes were a succession of three destructive earthquakes Catastrophe that happened Presence between 21 and 22 May 1960 .

This earthquake Catastrophe , which lasted 35 seconds , destroyed Destroying a third of the buildings in the city of Concepción .

The earthquake Catastrophe effectively interrupted Hindering and ended Process_end Lota 's coal miners march on Concepción where they demanded Request higher salaries .