|Table of Contents|

Electrical Conductivity Beneath Lanzhou Area of Gansu, China Inverted from Geomagnetic Depth Sounding by Using Improved Simulating Annealing Algorithm(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2021年第02期
Page:
332-342
Research Field:
应用地球物理
Publishing date:

Info

Title:
Electrical Conductivity Beneath Lanzhou Area of Gansu, China Inverted from Geomagnetic Depth Sounding by Using Improved Simulating Annealing Algorithm
Author(s):
WENG Ai-hua;  GUO Jun-hao
(College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, Jilin, China)
Keywords:
geomagnetic depth sounding;  electrical conductivity;  simulated annealing algorithm;  statistical analysis;  mantle transition zone;  inversion;  noise;  Lanzhou
PACS:
P318.2+1
DOI:
10.19814/j.jese.2020.08047
Abstract:
Geomagnetic depth sounding one-dimensional inversion can obtain the deep earth electrical conductivity structure beneath a geomagnetic station. The improved simulated annealing algorithm was applied to the inversion of geomagnetic depth sounding data, and the expected value based on the statistical analysis of all high-quality solutions in the inversion was used as the optimal solution of the model. The one-dimensional inversion results of synthetic geomagnetic depth sounding data show that for the noise-free theoretical data, the traditional simulated annealing algorithm can restore the true electrical conductivity profile; when there is noise, compared with the traditional simulated annealing algorithm, the improved simulated annealing algorithm can effectively overcome the influence of noise, and when the noise is below an acceptable level, the reliable estimation results of non-unique model parameters can be obtained. The inversion results of actual data from Lanzhou station show that in the sensitive depth range of geomagnetic depth sounding, the electrical conductivity profile is consistent with the previous ones; but in the lower mantle transition zone, the electrical conductivity is obtained by the inversion is relatively low. Based on the results of petrophysical experiments, it can be speculated that the lower layer of mantle transition zone beneath Lanzhou area may be dry and cold, and the deep mantle plume in the surrounding area may not affect the deep thermal state of Lanzhou area.

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Last Update: 2021-04-15