Earthquake evaluation method based on multi-type geophysical data

Abstract

The invention provides an earthquake evaluation method based on multi-type geophysical data. The method comprises the following steps: acquiring in-plate natural seismic data, surface elevation data, Bouguer gravity anomaly data, aeromagnetic anomaly data, seismic wave tomography, earth crust GPS movement rate and focal mechanism solution which have occurred in a target area; constructing a target area plane grid, and performing plane gridding processing on in-plate natural seismic data, surface elevation data, Bouguer gravity anomaly data and aeromagnetic anomaly data based on the target area plane grid; determining a plane distribution diagram of the strong earthquake region of the target region based on the plane gridding data; and superposing the surface elevation map, the plane distribution map of the strong earthquake area of the target area and the seismic wave tomography, analyzing the movement condition of the earth crust at the two sides of the strong earthquake area by combining the earth crust GPS movement rate and the seismic source mechanism solution, and analyzing the matching relationship between the strong earthquake area and the earth crust geological structure, thereby determining the geological cause of the strong earthquake area.

Description

technical field [0001] The invention belongs to the technical field of intra-plate natural earthquake evaluation, in particular to an earthquake evaluation method based on multi-type geophysical data. Background technique [0002] Intraplate earthquakes are earthquakes that occur inside the plate caused by the movement of the continental plate. Its location is relatively scattered, its frequency is low, its hazard is large, and its focal mechanism is complicated. The studies of continental geology and seismogeology in the past hundred years have shown that the interior of seemingly stable continents is neither a complete rigid body nor a complete elastic body. The remote effect of the tectonic force acting on the plate boundary generated by the relative movement between the plates is transmitted to the interior of the plate, and the tectonic revival of the pre-existing structure formed by multi-phase tectonic movements, which is now the dividing line between different blocks...

AI Technical Summary

Problems solved by technology

However, intraplate earthquakes have the characteristics of strong randomness in occurrence time, development depth, and earthquake magnitude. Simple projection points can only describe the occurrence characteristics of earthquakes qualitatively. Based on the distribution of existing intraplate seismic data, it is difficult to determine which areas are prone to Intraplate earthquakes occur; and compared with interplate earthquakes, intraplate earthquakes occur in areas with very low strain rates today, and deep pre-existing faults are difficult to identify

Therefore, accurate analysis of intraplate earthquakes is a great challenge

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