Curie isothermal surface buried depth inversion method through satellite magnetic anomaly

Abstract

The invention discloses a Curie isothermal surface buried depth inversion method through a satellite magnetic anomaly. The method comprises the steps that global initial CPD distribution is selected,and substituted into CPD buried depth; by means of CPD distribution and ESD forward calculation, global full-wave band lithosphere magnetic field (LMF) distribution is obtained, long wavelength in a lithosphere magnetic field is filtered and calculated through high-pass filtering, and a lithosphere magnetic field of middle-short wavelength in a study area is obtained; the lithosphere magnetic field obtained after filtering is compared with observation data or a model, and if the lithosphere magnetic field and the observation data or the model are smaller than a set inversion error, the CPD buried depth is output; otherwise, nolinear conjugate gradient (NCGM) inversion is conducted, and new CPD is obtained; the iterative process is circulated continuously until an ideal output result is obtained. Accordingly, the problem of how to obtain the regional Curie buried depth through satellite lithosphere magnetic anomaly observation or the model is solved, the inversion result is reliable, higher resolution and higher precision are achieved, and an inversion algorithm is rapid and convergent.

Description

Technical field [0001] The invention belongs to the technical field of geomagnetism, geothermal and geology research, and relates to a method for inverting the depth of the Curie isothermal surface from the satellite magnetic anomaly. Background technique [0002] The Curie isothermal surface (Curie or CPD for short) is an important temperature interface inside the earth's lithosphere. Obtaining its spatial distribution helps people understand the underground temperature distribution, lithospheric dynamics, plate tectonics, earthquake triggering mechanism and seismic activity The distribution characteristics of nature, and its application in the development and utilization of geothermal and mineral resources, etc. Although the inner part can be directly derived by thermal methods, due to the uncertainty of underground temperature gradient, rock thermal conductivity, and radioactive heat generation rate, the more reliable CPD distribution is generally obtained through magnetic inv...

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Problems solved by technology

[0006] The purpose of the present invention is to obtain a method for retrieving the buried depth of the Curie isothermal surface by the satellite magnetic anomaly, to obtain the uncertainty of the Curie in the aeromagnetic inversion, and the low resolution and low resolution of the traditional satellite magnetic inversion. Accuracy and other issues, how to obtain the regional Curie burial depth from satellite lithospheric magnetic anomaly observations or models, so that the inversion results are reliable, with higher resolution and higher precision, and the inversion algorithm converges quickly

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