On 6 March 1866 , during the Chincha Islands War , the Spanish steam frigate `` Blanca '' captured Conquering the Chilean sidewheel steamer Paquete de Maule in the Gulf of Arauco .

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 .