Earthquake Evaluation Method Based on Multiple Types of Geophysical Data

Abstract

The invention provides an earthquake evaluation method based on multi-type geophysical data. The method includes: obtaining intraplate natural earthquake data, surface elevation data, Bouguer gravity anomaly data, aeromagnetic anomaly data, seismic wave tomography, crustal GPS movement rate and focal mechanism solution in the target area; constructing a planar grid in the target area Based on this, the intra-plate natural seismic data, surface elevation data, Bouguer gravity anomaly data and aeromagnetic anomaly data are processed by plane grid respectively; based on the above data of plane grid, the plane distribution of the strong earthquake area in the target area is determined Figure: superimpose the surface elevation map, the planar distribution map of the strong earthquake area in the target area and the seismic wave tomography, combine the GPS movement rate of the crust and the solution of the focal mechanism, analyze the movement of the crust on both sides of the strong earthquake area, analyze the relationship between the strong earthquake area and The matching relationship of the geological structure of the crust, so as to determine the geological origin of the strong earthquake zone.

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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