Double-pair double-difference seismic locating method and double-pair double-difference seismic locating device
A positioning method and double-difference technology, applied in seismology, measuring devices, seismic signal processing, etc., can solve the problems of poor relative position accuracy between earthquakes and limited earthquake position accuracy
Active Publication Date: 2017-05-31
UNIV OF SCI & TECH OF CHINA
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However, this method is greatly affected by the velocity model outside the source area, and the relative position accuracy between earthquakes is poor.
[0005] Therefore, the accuracy of the earthquake location obtained by the current earthquake location method is limited and needs to be further improved.
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[0082] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0083] see figure 1 , a double-pair double-difference earthquake location method disclosed in this embodiment, it should be noted that the seismic data to be processed in this embodiment is seismic record data of earthquakes that have occurred, specifically including the following steps:
[0084] S101: Based on the absolute arrival time data of the first earthquake wave or the cross-correlation data of the seismic waveform, according to the preset rules, extra...
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The invention provides a double-pair double-difference seismic locating method and a double-pair double-difference seismic locating device. The double-pair double-difference seismic locating method includes extracting arrival time difference data of observed seismic event pairs and station pairs and further extracting observed double-pair arrival time difference data; computing double-difference of various seismic event pairs, double-difference of various station pairs and double-pair double-difference from the seismic event pairs to the station pairs. The double-pair double-difference seismic locating method and the double-pair double-difference seismic locating device have the advantages that influence of seismic original moments can be eliminated by the double-pair double-difference, station correction items can be omitted, influence of speed models outside and inside source regions can be eliminated, high-precision relative locations can be obtained, and high-precision absolute locations can be obtained by the aid of double-difference of the station pairs; inversion systems can be built according to linear relations between the double-difference of the station pairs and seismic locations and linear relations between the double-pair double-difference and the seismic locations, the locations of various seismic events can be inverted in hierarchical weighting modes, and accordingly high-precision seismic absolute locations and inter-seismic relative locations can be obtained.
Description
technical field [0001] The present invention relates to the technical field of earthquake location, and more specifically, to a double-pair double-difference earthquake location method and device. Background technique [0002] The precise location of seismic signals is important for monitoring earthquakes and studying active faults, subducting plates, volcanoes, and other structures associated with seismic activity. [0003] At present, the most popular earthquake location algorithm is the event-pair double-difference location algorithm proposed by Waldhauser&Ellsworth (2000). Velocity model effects can significantly improve the relative position between earthquakes. But this method is still affected by the velocity model in the source region, and its absolute position is poor. [0004] Zhang et al. (2010) proposed a station pair double difference positioning algorithm. This method uses the travel time difference data from the same event to two stations, which can elimina...
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IPC IPC(8): G01V1/30
CPCG01V1/30G01V2210/129
Inventor 郭浩张海江
Owner UNIV OF SCI & TECH OF CHINA