Multi‐Parameter Migration Imaging Of Magnetotelluric Data Using Finite Difference

Yu, Peng; Wang, Jialin; Wu, Jiansheng

doi:10.1002/cjg2.173

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…Furthermore, the main structural strike of the studied area is NNE [5] , the profile is basically along the dip direction of the electrical structure according to the principal axis from impedance tensor decomposition, so it is feasible to reveal the deep structure by 2-D inversion. Based on general inversion results and MT migration imaging [6] , we use 2-D unconstrained simulated annealing method to conduct the inversion [7] , Fig. 3 and Fig.…”

Section: Fig 1 Location Of the Surveyed Mt Profilementioning

confidence: 99%

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Using Long Period Magnetotelluric Profile of Fengcheng of Shanghai‐Huzhou of Zhejiang Province to Study Deep Electrical Structure

Wang

et al. 2008

Chinese J of Geophysics

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A magnetotelluric sounding (MT) profile from Fengcheng of Shanghai to Huzhou of Zhejiang province was conducted using GMS‐06 surveying system, high quality long period data over 4000 s were obtained. By inversion and processing, these MT data provide a basis for the studies of deep electrical and fault structures. Integrating with tipper interpretation result, gravity & magnetic data and updated seismic interpretation, new recognitions about the conductivity and fault structures are obtained. The styles of several large and deep faults such as Huzhou—Suzhou, Wuzhen—Majin, Fengjing—Chuansha and Taicang—Fengxian and their roles in controlling the regional tectonics are evaluated. The fault of Fengjing—Chuansha controls the nappe transition structure zone between Shanghai uplift and Huzhou—Nantong arched area. The main position of the fault of Taicang—Fengxian is deduced to be at the vicinity of Tinglin. Moreover, the electrical strata overlying on the high resistivity basement, the crustal high‐conductivity stratum existing in the west area of Huzhou—Suzhou fault, the bottom interface of lithosphere, are also revealed and interpreted.

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Section: Fig 1 Location Of the Surveyed Mt Profilementioning

confidence: 99%

“…The features of the faults revealed by pseudo-tipper will be discussed with electrical inversion results below. Moreover, the discontinuity of events in the reflecting coefficient result [4] of MT migration imaging [6] also gives evidence of fault existence.…”

Section: Fig 1 Location Of the Surveyed Mt Profilementioning

confidence: 99%

Using Long Period Magnetotelluric Profile of Fengcheng of Shanghai‐Huzhou of Zhejiang Province to Study Deep Electrical Structure

Wang

et al. 2008

Chinese J of Geophysics

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“…However, it is evident that these traditional inversion methods need a large number of calculation since they are based on a given primary model and modify it by forward calculation repetitiously to fit observed data. As to the tomographic inversion methods, most of them are from the seismic imaging techniques, such as the pseudo seismic interpretation method [6] , the imaging of reverse time migration method [7∼9] , and the multi-parameter migration imaging using an improved finite difference method [10] . Although these methods can show the intuitive images of anomalous structures or interfaces, they need to solve a series of complex problems caused by the propagation similarity between the electromagnetic (EM) wave in conductive media and the seismic wave in elastic media.…”

Section: Introductionmentioning

confidence: 99%

Appraisement on the MT Probability Tomography

Wang¹,

Mao²,

Yong-cai³

2005

Chinese J. Geophys.

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The effect of the MT probability tomography is analyzed at length in the view of mathematical and physical aspects. Theoretical analysis demonstrates that the scanner function takes a key role of the tomography. Whether the scanner function is reasonably defined or not, whether the method of extracting the abnormal field is properly or not, multi‐solution and the feature of, are factors which influence the effect of the tomography, and cause difficulty in interpretation. For some simple isolated models with a large granularity and a shallow burying depth, good results of the probability tomography will be got correspondingly. For complex models, influenced by the above factors, the effect of the tomography is not good and should be improved. The reliability of the conclusion is tested by the synthetic examples in this paper.

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Prospecting and Research on Fine Crustal Structure by Using Multi‐Geophysics Survey Methods in Shanghai Region

Bao-hua

Zhang

Wang

et al. 2007

Chinese J of Geophysics

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The fine seismic velocity structure, electrical conductivity structure and geometrical construction of the crust in Shanghai region and the coupled relationship between the deep and shallow structures are investigated by using multi‐geophysics exploration methods, such as shallow seismic reflection, deep seismic reflection, highresolution seismic refraction, deep seismic wide angle reflection/refraction and magnetotelluric sounding. This experiment is the first high‐resolution comprehensive deep survey profile in Shanghai and its conjoined regions. The research results indicate that the crust in the region can be divided into three layers, namely upper crust, middle crust and lower crust. The upper crust is 12~14 km thick with a seismic velocity of 5.7~5.9 km/s, the middle crust is about 10 km thick with a velocity of 5.9~6.2 km/s and the lower crust is 10~11 km thick with a velocity of 6.2~6.3 km/s. The depth of Moho in the region is 31~33 km. There is a thin velocity gradient layer (about 6 km thick) in the upper part of the lower crust, but the velocity gradient becomes greater near the Moho interface. There are 12 main faults interpreted in the experimental profile. Except for three faults, which have dislocated G interface (crystal basement) and extended below the bottom interface (whose depth is about 10 km) of the upper crust, the other faults have ended above G interface at 3 to 5 km depth, or have converged at G interface. Moreover, there is only a high conductivity layer (about 2 km thick) within crust at 13~15 km depth. Therefore, there is no deep structure condition for potential big earthquakes in the local region. However, the active rupture zones near the Earth's surface are potential seismic source zone.

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Multi‐Parameter Migration Imaging Of Magnetotelluric Data Using Finite Difference

Cited by 5 publications

References 11 publications

Using Long Period Magnetotelluric Profile of Fengcheng of Shanghai‐Huzhou of Zhejiang Province to Study Deep Electrical Structure

Using Long Period Magnetotelluric Profile of Fengcheng of Shanghai‐Huzhou of Zhejiang Province to Study Deep Electrical Structure

Appraisement on the MT Probability Tomography

Prospecting and Research on Fine Crustal Structure by Using Multi‐Geophysics Survey Methods in Shanghai Region

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