Far earthquake starting point depth fine positioning technology based on depth earthquake phase automatic matching

Abstract

The invention discloses a far earthquake starting point depth fine positioning technology based on depth earthquake phase automatic matching. According to the technology, on the basis of preprocessing far seismic record waveform data, a direct wave seismic phase is automatically searched and intercepted from data of each seismic station, a depth seismic phase template set corresponding to the seismic station is constructed based on the direct wave seismic phase, and then possible depth seismic phases are searched for in subsequent waveforms; the moment corresponding to the maximum value of the correlation coefficient is taken as the first arrival moment of the depth seismic phase, and the travel time difference between the depth seismic phase and the direct wave is calculated; after all possible depth seismic phases are searched, a plurality of assumed seismic starting points are given from shallow to deep at the known epicentral position, the arrival time of the theoretical depth seismic phases of each assumed seismic starting point is positively modeled, and the theoretical travel time difference between the depth seismic phases and the direct waves is calculated; and then an earthquake starting point is determined based on the theoretical travel time difference and the observed travel time difference of the possible depth earthquake phase, through the process, rapid and precise positioning of the depth of the earthquake starting point of the far earthquake can be realized.

Description

technical field [0001] The invention belongs to the technical field of teleseismic origin point positioning, and in particular relates to a teleseismic origin point depth fine positioning technology based on automatic matching of depth seismic phases. Background technique [0002] Seismic authoritative organizations in the world usually use the seismic phase travel time method to determine the location of the earthquake onset point, make earthquake quick reports and generate earthquake event catalogs. For example, the National Earthquake Information Center, the International Earthquake Center, and the International Data Center of the US Geological Survey mainly use short-period P waves, that is, seismic longitudinal waves, to locate the origin of the earthquake. When the seismic network is dense and the distance between the epicenters is small, the time of the earthquake, as well as the longitude, latitude, and depth coordinates of the earthquake point can be determined by t...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem that it is difficult to quickly and fully automatically locate the depth of the teleseismic onset point in the prior art, and propose a technology for fine positioning of the depth of the teleseismic onset point based on automatic matching of depth seismic phases

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