Novel approaches of magnetic inversion using seismic tomography in Taiwan area

Chen，Chieh Hung1,2; Chen，Chun Rong3; Sun，Shida4; Wen，Strong5; Du，Jinsong6; Lin，Cheng Horng7; Huang，Yi Hsuan5; Han，Peng8; Liu，Jann Yenq3,9,10

2021-03-01

10.1016/j.pepi.2021.106663

PHYSICS OF THE EARTH AND PLANETARY INTERIORS   影响因子和分区

0031-9201

1872-7395

Non-uniqueness is a problem encountered while imaging subsurface susceptibility by inverting magnetic field surveys. We propose a novel method to construct velocity-susceptibility initial models using Vp together with the Vp/Vs ratio from seismic tomography to improve the model which satisfies more information and better identifies locations of high-susceptibility materials. For comparison, two recovered susceptibility structures are derived from two distinct initials (homogeneous and velocity-susceptibility) models through the standard inversion process. Two profiles with intense undulation of magnetic anomalies over sedimentary areas in central-west Taiwan and complex geological structures at the rim of the subduction zone in northeast Taiwan are used as examples to compare the results of the initial models. The inversion results suggest that the susceptibility structures from both models agree in terms of the location of the fault zones, specifically at depth < 10 km. Recovered susceptibility structures derived from the velocity-susceptibility initial model agree with the geological structure that reduces uncertainty at depth > 10 km. Consequently, the initial model with velocity constraints lowers the non-uniqueness associated with the inversion of magnetic anomalies.

Magnetic anomaly Magnetic susceptibility Velocity tomography

SCI ; EI

英语

其他

National Natural Science Foundation of China[41604060,"U2039205"] ; Sichuan earthquake Agency-Research Team of GNSS based geodetic tectonophysics and mantlecrust dynamics of ChuanDian region[201803]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000632388400004

ELSEVIER

20210709924510

Geology ; Magnetism ; Seismographs ; Velocity

Geology:481.1 ; Earthquake Measurements and Analysis:484.1 ; Magnetism: Basic Concepts and Phenomena:701.2

GEOSCIENCES

2-s2.0-85100776502

Scopus

1.Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan,China
2.State Key Laboratory of Geological Processes and Mineral Resources,Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan,China
3.Department of Space Science and Engineering,National Central University,Taoyuan,Taiwan
4.Institute of Geophysics,School of Physics,Huazhong University of Science and Technology,Wuhan,430074,China
5.Department of Earth and Environmental Sciences,National Chung Cheng University,ChiaYi,Taiwan
6.Hubei Subsurface Multi-scale Imaging Key Laboratory,Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan,430074,China
7.Institute of Earth Sciences,Taipei,Academia Sinica,Taiwan
8.Department of Earth and Space Sciences,Southern University of Science and Technology,China
9.Center for Astronautical Physics and Engineering,National Central University,Taoyuan,Taiwan
10.Center for Space and Remote Sensing Research,National Central University,Taoyuan,Taiwan

Chen，Chieh Hung,Chen，Chun Rong,Sun，Shida,et al. Novel approaches of magnetic inversion using seismic tomography in Taiwan area[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2021,312.

Chen，Chieh Hung.,Chen，Chun Rong.,Sun，Shida.,Wen，Strong.,Du，Jinsong.,...&Liu，Jann Yenq.(2021).Novel approaches of magnetic inversion using seismic tomography in Taiwan area.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,312.

Chen，Chieh Hung,et al."Novel approaches of magnetic inversion using seismic tomography in Taiwan area".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 312(2021).