Electrical structure of the Kunlun–Qinling fault system, northeastern Tibetan Plateau, inferred from 3-D inversion of magnetotelluric data

Sun, Xiangyu; Zhan, Yan; Zhao, Lingqiang; Chen, Xiaobin; Sun, Jianbao; Li, Chenxia; Cui, Tengfa; Han, Jin

doi:10.1016/j.jseaes.2019.103910

Cited by 28 publications

(13 citation statements)

References 47 publications

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“…Tikhonov (1950) and Cagniard (1953) introduced the principles underlying the MT method, which, by inverting MT soundings, enables researchers to resolve resistivity structures up to several tens of kilometers below the earth's surface. Thus the MT method is commonly used for probing deep geological structures to shed light on tectonic settings (e.g., Chen and Chen 1998;Ryang et al 1999;Fuji-ta et al 2002;Han et al 2009;Choi et al 2013;Ikeda et al 2013;Sun et al 2019;Abdallah et al 2020;Gao et al 2020;Liang et al 2020a, b;Ye et al 2020;Zhang et al 2020). The audio-frequency MT (AMT) method, working on natural or artificial EM signals with frequencies higher than 1 Hz, provides good sounding resolution for resistivity structures at depths of a few kilometers.…”

Section: The Development and Application Of Em Methods In East Asiamentioning

confidence: 99%

“…Also notable in East Asia are advances in researchers' ability to interpret measurements. Frequency-and time-domain three-dimensional (3-D) inversions in relation to TEM and MT data have become popular in recent studies owing to their clarification of 3D structures (e.g., Ryang et al 1999;Han et al 2009;Choi et al 2013;Noh et al 2014;Sasaki et al 2014Sasaki et al , 2015Sun et al 2019;Zhang et al 2020). Noisereduction technologies provide effective tools for filtering out environmental or artificial EM noises in various regions (e.g., Feng and Wang 2011;Key and Constable 2011;Wang and Liu 2017;Wang et al 2017;Li et al 2020b, c).…”

Section: Recent Advances In Geophysical Em Studiesmentioning

confidence: 99%

See 1 more Smart Citation

A review of electromagnetic exploration Techniques and their applications in East Asia

Chang¹,

Goto²,

Hu³

et al. 2020

Terr. Atmos. Ocean. Sci.

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Electromagnetic (EM) exploration techniques, as powerful and important geophysical tools, have been extensively used in researches ranging from tectonics and resource exploration to environmental and engineering studies. These tools have also proven their applicability to such emerging fields as ocean and airborne surveys. In this article, we quantitatively and qualitatively review advances and applications of EM-exploration studies in East Asia during the past 20 years. During these last two decades, the field of electromagnetic exploration has grown fast, as shown in the increase in the number of related published articles. These studies focus mostly on the development of system platforms (space, aerial, marine) and on data-processing technologies (inversion algorithms, noise reduction). However, most EM applications have been limited to professional geophysics activities. Along with advances in electronics and sensor technologies, EM-exploration instruments are likely to evolve into a modularized open-access system that will become available to more and more scientists at lower and lower costs.

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Section: The Development and Application Of Em Methods In East Asiamentioning

confidence: 99%

Section: Recent Advances In Geophysical Em Studiesmentioning

confidence: 99%

A review of electromagnetic exploration Techniques and their applications in East Asia

Chang¹,

Goto²,

Hu³

et al. 2020

Terr. Atmos. Ocean. Sci.

View full text Add to dashboard Cite

show abstract

“…There are several published crustal models in our study region. These models are constructed either from wide-angle deep reflection, P-wave receiver functions earthquake, surface wave tomography or ambient noise tomography [ 8 , 9 , 10 , 11 , 12 , 23 , 24 , 25 ]. The study of the P-wave receiver functions of tele-seismic data shows that multiple low-speed, low-density belts exist in the upper and middle crust below the plateau from the Bayan Har block to the central-southern Longmenshan region at depths of approximately 10~15 km and 24–45 km [ 23 , 24 , 25 ], which is consistent with the results of Aba-Wuqi deep seismic reflection profile (from project report of the geophysical exploration center, China earthquake administration).…”

Section: Crustal Model and Density Structurementioning

confidence: 99%

“…There is little difference in the Moho interface compared with the average thickness of the Bayan Har block, approximately 60–62 km. The initial model is constructed based on the seismic velocity results in this area [ 8 , 9 , 10 , 11 , 12 , 23 , 24 , 25 , 26 ]. Based on the above geophysical observations and velocity/density conversion [ 27 ], an initial model of the crustal structure is obtained and shown in Table 2 .…”

Section: Crustal Model and Density Structurementioning

confidence: 99%

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Crustal Density Structure of the Jiuzhaigou Ms7.0 Earthquake Area Revealed by the Barkam–Jiuzhaigou–Wuqi Gravity Profile

Yang

Shen

Tan

et al. 2021

Sensors

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The Barkam–Jiuzhaigou–Wuqi gravity profile extends across the Jiuzhaigou Ms7.0 earthquake (in 2017) zone and passes through several historical big earthquakes’ zones. We have obtained Bouguer gravity anomalies along the profile composed of 365 gravity observation stations with Global Positioning System (GPS) coordinates, analyzed the observed data and inverted subsurface density structure. The results show that the Moho depth has a big lateral variation from southwest to northeast, which shallows from 57 km to 43 km with maximum variation up to 14 km within 800 km. The most acute depth change of the Moho is in the boundary region between the Bayan Har block and West Qinling–Qilian block. According to our analysis, it is related to the eastward movement of the Bayan Har block. There are three main pieces of evidence that support it: (1) Density is higher in the east of the Bayan Har block and smaller in the west, which is the same as seismic activity; (2) Two thin low-density layers exist in the upper and middle crust of the Bayan Har block, which may promote inter-layer slip and the Jiuzhaigou Ms7.0 earthquake occurred in the boundary area of the two low-density layers, where the crustal density and Moho surface fluctuate sharply; (3) the GPS velocity field in the southwestern part gravity profile is significantly larger than that of the northeastern part, which is consistent with the density structure. Our studies also suggest that the large undulation of the Moho prevents the movement of the Bayan Har block, and strain is prone to accumulate here. The dynamic background analysis of the crust in this area indicates that the Moho surface uplifts in the West Qinling–Qilian block, which decelerates the eastern migration of material on the Qinghai–Tibet Plateau, and leads to the weak tectonic activity of the north part of the Bayan Har block.

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Characteristics of the three-dimensional deep electrical structure in the Helan Mountains-Yinchuan Basin and its geodynamic implications

Zhao

Sun

Zhan

et al. 2023

Sci. China Earth Sci.

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Electrical structure of the Kunlun–Qinling fault system, northeastern Tibetan Plateau, inferred from 3-D inversion of magnetotelluric data

Cited by 28 publications

References 47 publications

A review of electromagnetic exploration Techniques and their applications in East Asia

A review of electromagnetic exploration Techniques and their applications in East Asia

Crustal Density Structure of the Jiuzhaigou Ms7.0 Earthquake Area Revealed by the Barkam–Jiuzhaigou–Wuqi Gravity Profile

Characteristics of the three-dimensional deep electrical structure in the Helan Mountains-Yinchuan Basin and its geodynamic implications

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