Three‐Dimensional Magnetotelluric Modeling using the Staggered‐Grid Finite Difference Method

Tan, Handong; Yu, Qingyan; Booker, J. R.; Wei, Wenbo

doi:10.1002/cjg2.420

Cited by 23 publications

(13 citation statements)

References 10 publications

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“…Two-dimensional inversion method becomes mature and practical [7,8] . Three-dimensional forward modeling and inversion are the MT hot topic in the world [9,10] , and the features of modern MT sounding are representative of these progresses.…”

Section: Introductionmentioning

confidence: 99%

Crustal Electrical Conductivity Structure of Yarlung Zangbo Jiang Suture in Southern Tibetan Plateau

Tan

Wei

Unsworth³

et al. 2004

Chinese J of Geophysics

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To study the structure in the shallow and deep crust along the east‐west and north‐south direction beneath the Yarlung Zangbo Jiang suture in the southern part of Tibetan plateau, three magnetotelluric profiles with super‐wide band of frequencies (Cona‐Maizhokunggar, Yadong‐Xuegula, Gyirong‐Coqên) across the Yarlung Zangbo Jiang suture were deployed. The result shows that large‐scale high resistive bodies exist near the Yarlung Zangbo Jiang suture surface, which extend to the maximum depth of more than 30km. They are the reflection of the Gangdise granite. There are small‐scale conductive bodies in the southern part of the Yarlung Zangbo Jiang suture, and large‐scale ones under the suture and in the northern part. Conductive bodies widely spread in the crust from south to north along the profiles. They are discontinuous with each other, and become larger in scale from south to north. They decline to the north, and are the steepest near the suture becoming deeper gradually from about 20km depth in the south part to about 70km depth in the middle of the suture. Under the Yarlung Zangbo Jiang suture, the conductive bodies becomes larger in scale, more conductive gradually from west to east. These important electrical characters are possibly caused by the India plate underthrusting to the north. The variation in characters of the large‐scale conductive bodies from west to east may be the proof that plate collision causes materials moving to the east.

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Section: Introductionmentioning

confidence: 99%

Crustal Electrical Conductivity Structure of Yarlung Zangbo Jiang Suture in Southern Tibetan Plateau

Tan

Wei

Unsworth³

et al. 2004

Chinese J of Geophysics

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“…The magnetotelluric source S can always be divided into two orthogonal sources, SX and SY (Tan et al, 2003a). …”

Section: Overview Of the Rapid Relaxation Algorithmmentioning

confidence: 99%

“…Forward modeling uses the staggered-grid finite difference method (Tan et al, 2003a). With a staggered grid, a discretization of the integral form of the Maxwell equations:…”

Section: Overview Of the Rapid Relaxation Algorithmmentioning

confidence: 99%

Parallel rapid relaxation inversion of 3D magnetotelluric data

2009

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We implement a parallel algorithm with the advantage of MPI (Message Passing Interface) to speed up the rapid relaxation inversion for 3D magnetotelluric data. We test the parallel rapid relaxation algorithm with synthetic and real data. The execution effi ciency of the algorithm for several different situations is also compared. The results indicate that the parallel rapid relaxation algorithm for 3D magnetotelluric inversion is effective. This parallel algorithm implemented on a common PC promotes the practical application of 3D magnetotelluric inversion and can be suitable for the other geophysical 3D modeling and inversion.

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“…Forward modeling uses the staggered-grid finite difference method (Tan et al, 2003a). With a staggered grid, a discretization of the integral form of the Maxwell equations d d d…”

Section: Overview Of the 3d Conjugate Gradient Inversion Of The Impedmentioning

confidence: 99%

Three-dimensional conjugate gradient inversion of magnetotelluric impedance tensor data

2011

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We developed a three-dimensional (3D) conjugate gradient inversion algorithm for inverting magnetotelluric impedance tensor measurements. In order to show the importance of including diagonal components of magnetotelluric impedance tensor in 3D inversion, synthetic data were inverted using the 3D conjugate gradient inversion, and the inversion results were compared and analyzed. The results from the 3D inversion of synthetic data indicate that both the off-diagonal and the diagonal components are required in inversions to obtain better inversion results when there are no enough data sites to recover the target resistivity structure. These examples show that lots of information about 3D structure is also contained in the diagonal components; as a result, diagonal components should be included in 3D inversions. The inversion algorithm was also used to invert the impedance tensor data acquired in the Kayabe area in Japan. Inversions with the synthetic and real data demonstrated the validity and practicability of the inversion algorithm.

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Three‐Dimensional Magnetotelluric Modeling using the Staggered‐Grid Finite Difference Method

Cited by 23 publications

References 10 publications

Crustal Electrical Conductivity Structure of Yarlung Zangbo Jiang Suture in Southern Tibetan Plateau

Crustal Electrical Conductivity Structure of Yarlung Zangbo Jiang Suture in Southern Tibetan Plateau

Parallel rapid relaxation inversion of 3D magnetotelluric data

Three-dimensional conjugate gradient inversion of magnetotelluric impedance tensor data

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