Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling

Wang, Haiyan; Gao, Rui; Zeng, Lingsen; Zhao-yang, Kuang; Aimin, Xue; Li, Wenhui; Xiong, Xuejian; Huang, Weixin

doi:10.1016/j.tecto.2014.08.010

Cited by 25 publications

(20 citation statements)

References 51 publications

(63 reference statements)

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“…Black stars indicate earthquakes with magnitude ( M s ) ≥ 8.0. (b) Comparison of crustal thickness determined from the H ‐ κ stacking method [ H. Wang et al ., ; W. Wang et al ., ] with from the joint inversion method. Black lines indicate ±3 km deviation.…”

Section: Resultsmentioning

confidence: 91%

“…The estimated crustal thicknesses were further interpolated into meshed 0.2° × 0.2° grids of the study area (Figure a). The crustal thickness varies from ∼65 km in the NETP to ∼40 km in the western NCC (Figure ), which is consistent with previous estimates from the H ‐ κ stacking method [e.g., Li et al ., , , ; Pan and Niu , ; Tian and Zhang , ; H. Wang et al ., ; Wang et al ., ; X. Wang et al ., ; W. Wang et al ., ; Xu et al ., ; Zheng et al ., ] and active‐source seismic profiles [e.g., Jia et al ., ; Liu et al ., ; Teng et al ., ; C. Y. Wang et al ., ; S. J. Wang et al ., ]. A difference in the Moho depth is observed from the QLT to Alxa block by as much as 10 km across the HF and NQF (Figure ).…”

Section: Resultsmentioning

confidence: 96%

“…(b) Major tectonic units in the study region. White and gray dots represent the locations of 673 broadband seismic stations of ChinArray (Phase II) and 51 temporary stations [ H. Wang et al ., ]. Two stations (15585 and 15596) are highlighted by black dots.…”

Section: Introductionmentioning

confidence: 99%

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Three‐dimensional lithospheric S wave velocity model of the NE Tibetan Plateau and western North China Craton

Xingchen

Ding

et al. 2017

JGR Solid Earth

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We present a new 3‐D lithospheric Vs model for the NE Tibetan Plateau (NETP) and the western North China Craton (NCC). First, high‐frequency receiver functions (RFs) were inverted using the neighborhood algorithm to estimate the sedimentary structure beneath each station. Then a 3D Vs model with unprecedented resolution was constructed by jointly inverting RFs and Rayleigh wave dispersions. A low‐velocity sedimentary layer with thicknesses varying from 2 to 10 km is present in the Yinchuan‐Hetao graben, Ordos block, and western Alxa block. Velocities from the middle‐lower crust to the uppermost mantle are generally high in the Ordos block and low in the Alxa block, indicating that the Alxa block is not part of the NCC. The thickened crust in southwestern Ordos block and western Alxa block suggests that they have been modified. Two crustal low‐velocity zones (LVZs) were detected beneath the Kunlun Fault (KF) zone and western Qilian Terrane (QLT). The origin of the LVZ beneath the KF zone may be the combined effect of shear heating, localized asthenosphere upwelling, and crustal radioactivity. The LVZ in the western QLT, representing an early stage of the LVZ that has developed in the KF zone, acts as a decollement to decouple the deformation between the upper and lower crust and plays a key role in seismogenesis. We propose that the crustal deformation beneath the NETP is accommodated by a combination of shear motion, thickening of the upper‐middle crust, and removal of lower crust.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 96%

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Three‐dimensional lithospheric S wave velocity model of the NE Tibetan Plateau and western North China Craton

Xingchen

Ding

et al. 2017

JGR Solid Earth

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“…The Haiyuan fault is an active northwest trending left‐lateral strike‐slip fault on the northeastern margin of the Tibetan Plateau (Figure ). This fault zone dips southwestward at 60°–80° near the surface down to ~10–15 km depth and then gradually flattens to ~30° at greater depth (Guo et al, ; Wang, Gao, et al, ). High slip rates (>10 mm/yr) have been suggested by some researchers (Lasserre et al, ; Tapponnier et al, ), but recent geological and geodetic studies all show ~3–6 mm/yr slip rates on this fault (e.g., Gan et al, ; Zheng et al, ).…”

Section: Faults and Seismicity In Eastern Tibetan Plateaumentioning

confidence: 99%

“…(1) Wen et al (), (2) Papadimitriou et al (), (3) Allen et al (), (4) Zhang et al (), (5) Fu et al (), (6) Wang, Gao, et al (), (7) Guo et al (), (8) Kirby et al (), (9) Chen et al (), (10) USGS (), (11) Zhang et al (), (12) Zhang et al (), (13) Burchfiel et al (), (14) Lin et al (), (15) Jia et al (), (16) Zhang et al ().…”

Section: Introductionunclassified

Stressing Rates and Seismicity on the Major Faults in Eastern Tibetan Plateau

Luo

Liu

2018

JGR Solid Earth

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Intensive studies following the 2008 Wenchuan and 2013 Lushan earthquakes have shown that these two events have changed stresses on major faults in eastern Tibetan Plateau. However, these stress changes are small perturbations to total stresses on these faults. To evaluate full stress evolution on faults and the associated earthquake hazard, we need to consider the effects of all regional large earthquakes and tectonic stressing on faults. Here we use a three‐dimensional viscoelastoplastic finite element model to investigate stress evolution and long‐term temporal patterns of seismicity on major faults in eastern Tibet. We first simulate stress changes due to coseismic slips and postseismic viscoelastic stress relaxation by regional 28 big earthquakes since 1327 and find that nine events, including the Wenchuan earthquake, occurred where Coulomb stress was decreased by the preceding events. We then evaluate interseismic stressing rates using the geodynamic model and GPS data and find the highest rate on Xianshuihe fault (~1,000–4,950 Pa/yr) and the lowest rate on Longmenshan fault (~150–1,133 Pa/yr). Including interseismic stressing in stress evolution shows that the Wenchuan earthquake ruptured where Coulomb stress had increased since 1327 and stresses on southern Xianshuihe and central Anninghe faults would have reached prerupture stress levels of their preceding ruptures. Finally, we analyze synthetic seismicity on faults and find that earthquakes on each fault tend to occur in clusters, separated by quiescent periods whose lengths are inversely related with fault slip rates. The time spans of earthquake clusters are affected by fault slip rates, fault configuration, and rheology.

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Geomorphic expression of the Lenglong Ling area, eastern Qilian Shan, and its coupling relationship with the deep structures

Hong³

et al. 2021

Geological Journal

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Located at the outer edge of the northeastern Tibetan Plateau, the Qilian Shan has long been considered to be the key area to address the issue of how the Tibetan Plateau generates its high topography. However, in spite of the fruitful achievements on the growth pattern and subtle crustal structures of the Qilian Shan, what we know about the regional topography evolution and its relationship with the deep structures are still lacking. In this study, the landscape features of the eastern Qilian Shan and the probable drainage evolution history of the Lenglong Ling, located within the central part of the eastern Qilian Shan, are investigated, based on the multiple geomorphic analyses (i.e., HI and steepness distributions, and the Gilbert and χ metrics). The topographic results show that high HI and steepness values distribute mainly in areas controlled by active faults (i.e., the mountain areas). In addition, the Gilbert and χ metrics suggest that the main Lenglong Ling divide is stable. According to the drainage divide stability criteria, we suggest that the presence of the uplift rate gradient in the eastern Qilian Shan (i.e., with higher uplift in the Lenglong Ling area), which is suggested by the topographic results, has driven the main divide to migrate southward and is now “holding” the divide in place. Taking the previously published magnetotelluric imaging into account, we reveal the coupling relationship between the deep structures and the regional geomorphic features, and further suggest that the Lenglong Ling Fault, or the Qilian‐Haiyuan Fault, makes a difference in regional strain transferring and relief generation.

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Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling

Cited by 25 publications

References 51 publications

Three‐dimensional lithospheric S wave velocity model of the NE Tibetan Plateau and western North China Craton

Three‐dimensional lithospheric S wave velocity model of the NE Tibetan Plateau and western North China Craton

Stressing Rates and Seismicity on the Major Faults in Eastern Tibetan Plateau

Geomorphic expression of the Lenglong Ling area, eastern Qilian Shan, and its coupling relationship with the deep structures

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