2‐D Crustal Structures Along Wuqing‐Beijing‐Chicheng Deep Seismic Sounding Profile

Wang, Shuaijun; Zhang, Xian‐Kang; Zhang, Chengke; Wang, Fuyun; Zhao, Jun‐Hong; Zhang, Jian-shi; Liu, Baofeng; Pan, Suli; Gai, Yu-Jie

doi:10.1002/cjg2.1172

Cited by 16 publications

(18 citation statements)

References 6 publications

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“…This layer consists of two velocity discontinuities and a group of gradient layers: the top-layer of upper-crust with velocity of 2.00∼3.00 km/s is a strong gradient layer and velocity variation is low in south, high in north; from the earth's surface to crystalline basement interior is also a strong gradient layer with velocity of 3.00∼4.50 km/s; the crystalline basement has large fluctuation. The covering layer is relatively thick to the south of stake number 170 km and the thickness is about 6.5 km near Bohai bay, which is basically in accordance with the results of Tianjin-Beijing-Chicheng profile [21] . The covering layer gradually thins to 2.0 km to the north of stake number 170 km.…”

Section: The Characteristics Of Crustal Velocity Structuresupporting

confidence: 86%

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Crustal Structure and Its Features in Northwest Margin of Bohai Bay and Its Adjacent Areas

Wang

Zhang

Fang

et al. 2008

Chinese J of Geophysics

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In this paper wide‐angle reflection and refraction data is used along Tanggu‐Yutian profile and other five profiles intersecting with this profile, and the seismic sounding data was processed and interpreted comprehensively along Tanggu‐Yutian profile. The purpose is to find out the basic features of 2‐D velocity structure, spacial distribution of faults, geological structure condition of shallow and deep crust in the northwest margin of Bohai bay and its adjacent area. The result shows that obvious layered structure appears along the profile, the crustal thickness increases gradually from south to north, and the crustal velocity structures in different regions have obvious inhomogeneity in the lateral and vertical directions. The Moho is a slope between Tanggu and Ninghe near Bohai bay. The crustal depth deepens gradually towards north from 28 km in Tanggu to 31 km in Ninghe.

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Section: The Characteristics Of Crustal Velocity Structuresupporting

confidence: 86%

“…In combination with the result of previous seismic sounding profiles passing through the survey area [6∼11, 21] , h is depth, t is reduced travel-time, X is distance. a 2-D velocity structure of crust has been obtained along this profile (Fig.…”

Section: The Characteristics Of Crustal Velocity Structurementioning

confidence: 99%

Crustal Structure and Its Features in Northwest Margin of Bohai Bay and Its Adjacent Areas

Wang

Zhang

Fang

et al. 2008

Chinese J of Geophysics

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“…During data processing, it was found that the velocity spectrum of reflective waves from middle and lower crust are highly discrete so that stacking velocity cannot be determined by the conventional method. To improve the stack effect of deep reflection waves, we have used velocities from the deep seismic wide-angle reflection/refraction profile [13] , that nearly coincides with the profile of this work, at corresponding depths.…”

Section: Data Acquisition and Processingmentioning

confidence: 99%

Probing Fine Crustal Structure in the Beijing Region Using a Deep Seismic Reflection Profile

Liu

Meng

et al. 2009

Chinese J of Geophysics

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The fine crustal structure and tectonics of the Beijing region are explored by using a 100 km long, NW-trending deep seismic reflection profile. This profile passed through the Sanhe-Pinggu earthquake (M 8.0) area and main faults in the Beijing region. The results show that the crust beneath the investigated area is divided into upper and lower crust by a strong reflective zone at about 6∼7 s TWT. The thickness of the upper and lower crust is about 18∼21 km and 13∼15 km, respectively. There are rich reflective layers and clear structural patterns above 3∼4 s TWT as well as obviously different structural features along the profile. In the west of the Sanhe-Pinggu earthquake area, the stacked deep seismic reflection section shows 2∼3 groups of strong reflective layers and a series of basement faults. In the east of the Sanhe-Pinggu earthquake area, there is a set of dense, west-dipping, reflective strata with relatively strong energy, which have the typical characteristics of a sedimentary basin. The largest depth of the sedimentary basin is about 8∼9 km. The deep fault in crust revealed by the deep seismic reflection profile has a steep plane, and it cuts and disturbs the lower crust and crust-mantle transitional zone. This deep fault extends upwards into the upper crust, and joins the crustal deep structure to the shallow fault. The profile reveals that the deep-shallow fault system represents the major deep-shallow tectonic feature in the study region.

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“…The azimuthal anisotropy of the surface wave group velocity, Pms anisotropy, and S-wave azimuthal anisotropy (Figure 9B) also show almost the same characteristics (Lu et al, 2014;Cai et al, 2016;Liu et al, 2019). The RRF zone, as a critical plate boundary cutting the Moho surface (Wang et al, 2014), did not cause the FPD of the anisotropy in the crust to be parallel to the strike of the fault. The tectonic stress field obtained from the focal mechanism (Xu, 2001;Wu et al, 2004;Xu et al, 2016) and the GPS velocity field (Jin et al, 2019) show that the maximum principal stress in the vicinity of the middle RRF zone is in the near N-S direction, which is consistent with the FPD of azimuthal anisotropy (Figure 9A).…”

Section: Crustal Deformation Mechanism Of Simao Block and Its Surroun...mentioning

confidence: 74%

Characteristics of azimuthal anisotropy in SE Tibetan plateau and its relationship with the background of block structure

Liu

Fang

et al. 2023

Front. Earth Sci.

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The southeastern Tibetan Plateau, which includes the Tibetan Plateau, Yangtze Block, and Cathaysia Block, is geotectonically situated in the compound part of the Tethys-Himalayan tectonic domain and the Peninsular Pacific tectonic domain. It is one of the critical regions for studying the scientific problems of plateau material lateral escape, lithosphere deformation, geotectonic properties of blocks, and deep dynamics. In this study, we use ambient noise data recorded by 401 broadband stations to obtain high-resolution short-period (T = 4–32 s) Rayleigh wave azimuthally anisotropic phase velocity maps. These could provide fresh clues for an in-depth understanding of the crust-mantle velocity structure, deformation mechanism, and geotectonic evolution in the southeastern Tibetan Plateau. Within the Simao block, the strikes of the faults and the orientations of the principal compressive stress of the stress field both generally coincide with the fast-wave polarization direction (FPD). The FPD near the Lancangjiang fault zone in the west is in the NE-SW direction, near the Wuliangshan fault zone in the center is near the NS direction, and near the Red River fault zone in the east is the NW-SE direction. We estimate that the compressive stress in the southwest direction of the Tibetan Plateau material has a controlling effect on the crustal deformation of the Simao block, which is likewise blocked by the Lincang granite belt, resulting in strong tectonic deformation. The FPD of the crust in the middle Red River fault zone is NS direction, significantly different from the fault strike. Combining with the seismic activity and GPS results, the depth of 8 km below the surface of the middle Red River fault is completely locked, and we conclude that the anisotropy of the upper crust of the middle part of the Red River fault zone is related to the action of the regional tectonic stress field. Taking into account geochemical and thermochemical results, we speculate that the complex tectonic stress at the junction of the blocks leads to prominent regional characteristics of the FPDs of azimuthal anisotropy in the crust, suggesting that the Shizong-Mile fault zone may be the western boundary between the Yangtze block and the Cathaysia block.

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2‐D Crustal Structures Along Wuqing‐Beijing‐Chicheng Deep Seismic Sounding Profile

Cited by 16 publications

References 6 publications

Crustal Structure and Its Features in Northwest Margin of Bohai Bay and Its Adjacent Areas

Crustal Structure and Its Features in Northwest Margin of Bohai Bay and Its Adjacent Areas

Probing Fine Crustal Structure in the Beijing Region Using a Deep Seismic Reflection Profile

Characteristics of azimuthal anisotropy in SE Tibetan plateau and its relationship with the background of block structure

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