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Calculation Method of Coulomb Stress for Inhomogeneous Ellipsoidal Earth Seismic and Surface Loads

A computational method, non-uniform technique, applied in the field of geophysics

Active Publication Date: 2020-01-17
NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the current calculation methods of Coulomb stress change, such as Coulomb3. Calculation method of co-seismic, post-seismic and inter-seismic Coulomb stress changes and viscoelastic Coulomb stress changes caused by surface loading process considering seismic cycle

Method used

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  • Calculation Method of Coulomb Stress for Inhomogeneous Ellipsoidal Earth Seismic and Surface Loads
  • Calculation Method of Coulomb Stress for Inhomogeneous Ellipsoidal Earth Seismic and Surface Loads
  • Calculation Method of Coulomb Stress for Inhomogeneous Ellipsoidal Earth Seismic and Surface Loads

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Embodiment

[0137] The 2008 Wenchuan moment magnitude 7.9 earthquake is located in the Longmenshan fault zone on the eastern boundary of the Bayan Har block, which has obvious segmentation of seismic activity. In today's seismically active zone, the coseismic-post-seismic Coulomb stress change calculation of the Wenchuan earthquake is an optimal and important implementation example to verify the validity of the method of the present invention.

[0138] Figure 6 The calculation grid for the Wenchuan Earthquake shows well that the model calculation takes into account surface topography and lateral heterogeneity. The calculation is based on the static distribution of faults released by China Earthquake Administration and USGS (United States Geological Survey), so that the co-seismic and post-seismic stress drop caused by the earthquake can be directly calculated, and then put into the formula to obtain the co-seismic-post-seismic Coulomb stress change , the coseismic-post-earthquake Coulom...

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Abstract

The invention discloses a non-uniform ellipsoid earth earthquake and ground surface load coulomb stress calculation method. According to the method, seismic shear dislocation and ground surface load are respectively equivalent to a body force item and a surface force item in finite element calculation; and calculation accuracy is guaranteed with a local grid adaptive encryption technology. With the method adopted, the coulomb stress change of the coulomb stress of an earthquake, including inter-seismic, co-seismic and post-seismic coulomb stress, and coulomb stress change caused by ground surface load, such as the loading and unloading of topographic erosion, glacial ablation and reservoir water pumping and impounding can be calculated. The method includes the following specific steps of:equivalent substitution of seismic shear dislocation and ground surface load; grid adaptive encryption; viscoelastic maxwell volume fractional constitutive recursive realization; lateral non-uniform ellipsoidal earth implementation; and automatic calculation by a program. The method of the invention is more comprehensive and accurate in calculation, and embodies the whole process of the earthquakeand volcanic coulomb stress change of the shallow superficial sphere of the earth.

Description

technical field [0001] The invention relates to the field of geophysics, in particular to an elastic-viscoelastic coulomb stress variation calculation method for processes such as earthquakes and surface loads of an ellipsoidal earth considering terrain and laterally heterogeneous media. It is mainly used in the fields of geodesy and seismic hazard. Its function is to calculate these loads based on the static slip distribution of earthquakes or geophysical data such as surface glacier ablation and reservoir water storage, considering the real earth's surface topographical fluctuations and medium lateral inhomogeneity. / Coulomb stress changes in surrounding faults caused by the unloading process. Background technique [0002] The permanent deformation of the earth system can change the stress distribution of the surrounding elastic medium. The most typical is that the stress distribution caused by major earthquakes, glacier ablation, reservoir water storage and other processe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 黄禄渊张贝王成虎
Owner NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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