Variable density-based crust thickness gravity inversion method

Abstract

The invention discloses a variable density-based crust thickness gravity inversion method. The variable density-based crust thickness gravity inversion method comprises the steps of acquiring crust thickness and density data and upper mantle density data of a crust model CRUST 1.0 with global coverage space resolution 1 degree by 1 degree; building crust-mantle density difference changing with a horizontal position according to density and thickness of upper crust, intermediate crust and lower crust and upper mantle density data of the crust model CRUST 1.0; obtaining gravity abnormality caused by fluctuation of a moho surface by bouguer gravity anomaly; and converting depth of the moho surface and obtaining the crust thickness by gravity abnormality caused by the bouguer gravity anomaly. Compared with the prior art, disclosed document is used as a foundation, a practical crust-mantle density model is built, the variable density-based crust thickness gravity inversion method is easily implement from technology, an inversion result more conforms to actual geologic characteristic, and higher accuracy is achieved.

Description

technical field [0001] The invention relates to the field of earth science, in particular to a gravity inversion method of crustal thickness based on variable density. Background technique [0002] The change of the earth's gravity field is related to the uneven distribution of material density from near the surface to the deep part of the earth, and the distribution of material density is the reflection of the structure and changes of the earth system. Therefore, to observe the earth's gravity field and study the gravity caused by the uneven distribution of underground material density Changes (that is, gravity anomalies) have important scientific significance for understanding the structure of the earth's sphere, geodynamic processes, resources and environmental changes. In addition, gravity observation is simple and data collection is convenient. Relatively speaking, gravity exploration has the advantages of economy, large exploration depth, and rapid acquisition of area ...

AI Technical Summary

Problems solved by technology

[0007] The density difference along the section well reflects the lateral change characteristics of the crust-mantle density difference, which is consistent with the actual geological characteristics. However, it is only a two-dimensional result, which cannot show the regional variation characteristics of Moho depth and crustal thickness.

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