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Spherical coordinate system density interface forward modeling method and system suitable for surface observation surface

A technology of spherical coordinate system and observation surface, which is applied in the research field of crust-mantle density interface structure, can solve problems such as inapplicability, and achieve the effect of improving the accuracy of forward modeling and reducing the amount of calculation

Active Publication Date: 2022-05-27
INST OF GEOPHYSICS CHINA EARTHQUAKE ADMINISTRATION +1
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Problems solved by technology

However, when the research area is a large area or even a global scale, the actual surface observation surface is a curved surface, and the forward modeling method of the density interface in the conventional Cartesian coordinate system is no longer applicable, and the forward modeling method of the density interface in the spherical coordinate system is required
Uieda&Barbosa (2017) studied the inversion method of the spherical coordinate system density interface, but it is only applicable to the upper-air observation surface and not to the surface observation surface

Method used

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  • Spherical coordinate system density interface forward modeling method and system suitable for surface observation surface
  • Spherical coordinate system density interface forward modeling method and system suitable for surface observation surface
  • Spherical coordinate system density interface forward modeling method and system suitable for surface observation surface

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Embodiment 1

[0065] In the method described in this embodiment, a spherical coordinate system density interface forward modeling method suitable for the surface observation surface is used to obtain the grid data of the surface observation surface gravity anomaly caused by the density interface model, which is beneficial to the regional and even global Scale crust-mantle density interface structure analysis, regional tectonic research, etc.

[0066] Step 1: Read the known geographic coordinate system (latitude and longitude) density interface depth grid model ( figure 2 ) and interface residual density Δρ=-0.3g / cm 3 ;

[0067] Step 2: Divide the material layer between the surface observation surface and the density interface into a number of Tesseroid cell combinations and arrange them according to the rules of the model grid. The density of each Tesseroid cell is equal, the size in the latitude and longitude directions is consistent with the model grid, and the top surface is the ground...

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Abstract

The invention discloses a spherical coordinate system density interface forward modeling method and system suitable for an earth surface observation surface, and belongs to the research field of crust-mantle density interface structure. The method includes the following steps: a data reading step, a unit body subdivision step, a subunit body subdivision step, a unit body gravity abnormal value acquisition step, and a density interface gravity abnormal grid data acquisition step. The invention can reflect the gravity anomaly caused by the regional density interface, and provides strong technical support for the high-precision inversion of the crust-mantle interface structure on a regional or even global scale.

Description

technical field [0001] The invention belongs to the research field of crust-mantle density interface structure, and in particular relates to a spherical coordinate system density interface forward modeling method and system suitable for surface observation surfaces. Background technique [0002] When there is a density difference between two adjacent formations or rock formations underground, the interface between them is called the density interface. When the underground density interface has lateral fluctuations, it will cause gravity anomalies on the surface observation surface. Conversely, knowing the gravity anomalies of the surface observation surface, the depth fluctuation of the underground density interface can be inferred and inferred, and then the deep structure and structure of the region can be inferred. Explanation provides in-depth evidence. Density interface forward modeling is the theoretical basis of density interface inversion, and a high-precision forwar...

Claims

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Application Information

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IPC IPC(8): G06F30/23
CPCG06F30/23
Inventor 石磊王祥
Owner INST OF GEOPHYSICS CHINA EARTHQUAKE ADMINISTRATION
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