Evaluación de la sismicidad asociada a los eventos sísmicos mayores a Mw 7.0 en los últimos 25 años en América del Sur.

Abstract

The western coast of South America is one of the most seismic areas in the world as it is located within the 'Ring of Fire', located along the Pacific Ocean characterized by concentrating some of the world's most important subduction zones, resulting in intense seismic and volcanic activity registering more than a quarter (25%) earthquakes of magnitude 8.0 or greater in the world, and has witnessed huge losses throughout recorded history. Most major earthquakes in South America are limited to shallow depths of 0 to 70 km resulting from sliding along the immersion interface between the Nazca and South American plates, this subduction process is responsible for the elevation of the Andes mountain range, and the active volcanic chain. Seismological studies identified large areas along the coast of Ecuador, Peru and northern Chile, where there is the possibility of large-scale earthquakes that can reach up to 9.0Mw or higher. The occurrence of an important is accompanied by several events, some foreshocks and a series of aftershocks, these can extend several years, as long as it continues to release energy from the seismic area, although it will gradually decrease. Future human and financial losses can be mitigated by informed decision-making based on where future earthquakes can occur, how often they could occur, their magnitude, and associated events. In this paper, a database will first be created according to records of earthquakes that occurred in the countries of Chile, Ecuador, Colombia and Peru in the last 25 years and all their aftershocks greater than 5 Mw after 5 months of the main event, probabilistic aftershocks recurrence schemes will be carried out.