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. There are two places recorded in the scientific community. I believe everyone knows that several super earthquakes have occurred. One is the fault zone in Chile, and the other is the fault of the Japanese earthquake . These two areas have broken the historical records of earthquakes. Dangerous earthquakes can be said to have brought painful lives to the people in the local area.
According to scientific earthquake records, two earthquakes occurred in the regional fault zones of Chile and Peru in Peru this month, namely 5.6 magnitude 5 and 6 magnitude 5. Of course, it is not a big fuss for this area, because the earthquake area is still an active area in the global earthquake zone, and active major earthquakes still exist in cycles.
According to scientific data, in 2015, a magnitude 3.3 earthquake occurred in a locked part of Chile and South America, with a small magnitude, but this location is very special. It is located in the fault area of two major earthquakes in 1880 and 1943. Scientists have shown that an earthquake of magnitude 8 or above may occur in the region every 60 to 80 years, which is a regular pattern seen so far has been confirmed.
Scientists said that because the NASCAR plate and South American plate subduction at a constant rate of 6.5 cm/year, the accumulation of elastic deformation of the above plates is consistent with this, resulting in a sliding defect of about 4.5 meters every 70 years. Based on the geodesy measurement of , seismic and far-field tsunami data, the researchers described the shallow sliding area that could lead to a large number of large tsunamis.
Scientific research simulations also showed that the clear mismatch between the sliding inclination angle of this area and the convergence direction of the plate, which indicates that the number of large strike-slip areas will increase. Through GPS sites, comprehensive analysis and new survey data from more than 50 pre-existing monitoring sites and InSAR data, the scientists found that the 2015 fault zone was very consistent with the 1943 fault zone, with no significant sliding south of 32°S and south of 30.2°S (Lingua de Vaca, the peninsula).
Scientists say, but the shallowest part of the subduction interface still changes. Research shows that the inclination angle of the seismic region is fully compatible with the convergence direction of the inclined plates (rather than perpendicular to the grooves), and is located on the highest coastal topography and high steps without sliding, increasing the potential correlation problem between seismic period and long-term permanent deformation. Finally, we also found that early sliding after the earthquake mostly occurs in the lower inclined areas of the coseismic fault, extending to the north and south of the broken fault area in 2015.
Author: Text/Luo Zhaochun
References: Crust Structural Physics
