Energy-based method for automatically locating earthquake focus of microearthquake

Abstract

An energy-based method for automatically locating the earthquake focus of a microearthquake belongs to the field of microearthquake detection, and relates to an earthquake focus locating method used in a microearthquake monitoring system, in particular to an automatic microearthquake locating method and a method for improving the locating accuracy. The invention adopts an earthquake wave dynamic method which is an earthquake locating algorithm based on earthquake wave energy attenuation equation, complicated calculation of energy of the earthquake waves is not required, parameters such as themaximum shake amplitude or quadratic sum of the shake amplitude and the like are adopted to represent energy, and the arrival time of the earthquake waves does not need to be picked up at all, so that problems caused during automatic locating of the earthquake focus of the microearthquake are solved; and as energy difference is taken as the optimized variable, while energy attenuation is in direct correlation with range, the defect that the travel-time difference serving as the optimized variable is only related to the travel-time difference (range difference) but not in direct correlation with the size of the range per se, the external-field locating accuracy, particularly the accuracy in the vertical direction, is improved, and the stability of the locating result is also improved.

Description

technical field [0001] The invention belongs to the field of microseismic detection, and relates to a seismic source positioning method in a microseismic monitoring system, in particular to a seismic source automatic positioning method and a method for improving positioning accuracy. Background technique [0002] Microseismic monitoring technology, as a monitoring technology for the internal fracture field of rock mass, has the characteristics of long-distance, three-dimensional and real-time, and has broad application prospects in mining, geotechnical, water conservancy and hydropower projects, and has been paid more and more attention by people. The core of the microseismic monitoring technology is the location of the seismic source, and whether it can be quickly and accurately located is the key to whether the microseismic monitoring system can play a role. [0003] The function of a typical microseismic monitoring system can be described as follows: First, multiple sets ...

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Problems solved by technology

[0006] The key problem to be solved by the present invention is to change the traditional seismic source location algorithm based on the seismic wave travel time equation, and solve the problems existing in the seismic wave arrival time picking, such as low efficiency of manual picking, large deviation, low precision of automatic picking, poor adaptability, and difficulty in automatic picking. Positioning and other problems; solve the problem of large positioning errors in the field and unstable positioning results, especially the problem of large height positioning errors in the positioning of working faces in mine stopes

Seismic wave dynamics method - the source location algorithm based on the seismic wave energy attenuation equation, and the energy of the seismic wave does not require complicated calculations, and the energy is expressed by parameters such as the maximum amplitude or the square sum of the amplitude, and there is no need to pick up the arrival time of the seismic wave at all, so as to solve the problem The problem of automatic positioning of the microseismic source is solved; since the energy of the seismic wave is directly related to the propagation distance, the problem of insensitivity to the travel time difference and the propagation distance in the field positioning is overcome, thereby improving the positioning accuracy and the stability of the positioning results

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