A Method for Extracting Earthquake Precursor Anomaly Information Based on No-filtering Maximum Shear Strain
An anomaly information and extraction method technology, applied in the field of earthquake precursor anomaly information extraction based on the maximum shear strain without filtering, can solve the problems of no further extraction of maximum shear strain information, few gravity gradient tensors, etc., to avoid weakening and suppressing "North-south strip" error, the effect of clarifying the physical meaning
Active Publication Date: 2022-03-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0004] Looking at the above coseismic gravity anomaly information extraction methods, they are all based on the data of the Earth’s lunar gravity field model, and after replacing low-order items, removing the average gravity field, removing the influence of hydrological factors, and filtering, the data before and after the earthquake are directly analyzed. comparative analysis of the gravity changes of the 2000-2000, the gravity gradient tensor is seldom obtained through processing, and the maximum shear strain information is not further extracted to detect its pre-earthquake anomaly information
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[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only It is a part of the embodiments of this application, not all of them. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without...
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The invention discloses a method for extracting earthquake precursor anomaly information based on the maximum shear strain without filtering, comprising the following steps: obtaining the hydrological spherical harmonic expansion coefficient through the GLDAS hydrological data of the target area, and combining the GRACE spherical harmonic coefficient and the hydrological spherical harmonic coefficient of the target area Harmonic expansion coefficient difference is obtained to obtain the GRACE monthly gravity field data without the influence of hydrological factors; based on the GRACE monthly gravity field data of adjacent months, the monthly differential gravity field data is obtained; based on the left-handed local northing coordinate system, through the Lagrangian The gravity strain tensor is used to obtain the maximum shear strain, and the anomaly information extraction model is constructed by setting the offset index; based on the constructed anomaly information extraction model, the target area is analyzed, and the anomaly information of the target area is extracted within half a year before the earthquake. Prediction has reference and indication significance, and the method of the invention can detect abnormal information before an earthquake with magnitude 6 or above.
Description
technical field [0001] The invention belongs to the technical field of earthquake prediction, and relates to a method for extracting earthquake precursor anomaly information based on maximum shear strain without filtering. Background technique [0002] Earthquake is one of the most destructive and harmful sudden natural disasters in modern society. The mainland of China is located at the junction of the Eurasian seismic belt and the three major plates. It is an area where shallow earthquakes occur frequently, and extremely destructive strong earthquakes will occur. Therefore, it has become one of the countries with the most serious earthquake disasters. At present, the world is facing a new period of seismic activity. Destructive earthquakes will cause losses to national economic construction and people's life and property safety. Therefore, how to effectively extract pre-earthquake anomaly information is particularly important. For gravity field inversion in a large area, ...
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IPC IPC(8): G06F30/20G06F16/215G06F16/29
CPCG06F30/20G06F16/29G06F16/215
Inventor 宋冬梅王慧单新建崔建勇王斌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)