Crustal thickness map of the Chinese mainland from teleseismic receiver functions

Li, Yonghua; Gao, Mengtan; Wu, Qingju

doi:10.1016/j.tecto.2013.11.019

Cited by 197 publications

(143 citation statements)

References 69 publications

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“…Pamir was pieced together from a series of tectonic blocks during the Paleozoic and Mesozoic periods [12,13]. The Cenozoic strong shortening and thickening of Pamir is considered to be a response to the continuous collision and compression between the Indian and Eurasian plates [12][13][14], with a maximum crustal thickness of approximately 70 km [10,15], which approaches the average crustal thickness of Tibet Plateau estimated from seismic wave data [16,17]. The kinematic venation of Pamir is dominated by~N-S shortening and orogen-parallel extrusion flow of material [8,9].…”

Section: Tectonic Settingmentioning

confidence: 99%

Slip Model for the 25 November 2016 Mw 6.6 Aketao Earthquake, Western China, Revealed by Sentinel-1 and ALOS-2 Observations

Wang

Wen

et al. 2017

Remote Sensing

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Abstract:On 25 November 2016 (UTC 14:24:30), an Mw 6.6 dextral strike-slip earthquake ruptured Aketao county in the northwestern portion of the Kongur Shan extensional system, western China. We extracted surface deformation maps and investigated the distribution of the coseismic slip of the 2016 Aketao earthquake by exploiting the Interferometric Synthetic Aperture Radar data imaged by the Sentinel-1 satellites of the European Space Agency and the ALOS-2 satellite of the Japanese Aerospace Exploration Agency. Assuming the crust of the earth is an elastic half-space homogeneous medium, the best fitting slip model suggests a dip angle of 78 • for the seismogenic fault. The rupture of the 2016 Aketao earthquake may have consisted of two sub-events that occurred in rapid succession within a few seconds, resulting in two large discrete asperities with maximum slip of~0.85 m, which were separated by a~6 km-wide small slip gap. The maximum slip for the sub-event near the epicenter was mainly concentrated at a depth of~10 km and that of the other at a depth of~5 km. The estimated total seismic moment from the optimal slip model is 1.58 × 10 19 N·m, corresponding to an event with a moment magnitude of 6.74. More than 65% of the aftershocks occurred in the areas of increased Coulomb failure stress, in which the stress was estimated to have been increased by at least 0.1 bar. Matching the potential barrier on the fault with the depth distribution of aftershocks implies that friction on the causative fault was heterogeneous, which may play a primary role in controlling the active behavior of the Muji fault.

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Section: Tectonic Settingmentioning

confidence: 99%

Slip Model for the 25 November 2016 Mw 6.6 Aketao Earthquake, Western China, Revealed by Sentinel-1 and ALOS-2 Observations

Wang

Wen

et al. 2017

Remote Sensing

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“…The collision initiated at ~59 ± 1 Ma (Hu et al, ), with the continuing northward motion of India since has created a region of deformed lithosphere that reaches from the Himalayan front to the Mongolia Steppe. Active deformation resulting from the convergence is readily observable, for example, in surface topography (Fielding et al, ), crustal thickness (Li et al, ), lithospheric thickness (McKenzie & Priestley, ), seismicity (Priestley et al, ), and geodetic strain rates (Kreemer et al, ).…”

Section: Introductionmentioning

confidence: 99%

Crustal Deformation in the India‐Eurasia Collision Zone From 25 Years of GPS Measurements

et al. 2017

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The India‐Eurasia collision zone is the largest deforming region on the planet; direct measurements of present‐day deformation from Global Positioning System (GPS) have the potential to discriminate between competing models of continental tectonics. But the increasing spatial resolution and accuracy of observations have only led to increasingly complex realizations of competing models. Here we present the most complete, accurate, and up‐to‐date velocity field for India‐Eurasia available, comprising 2576 velocities measured during 1991–2015. The core of our velocity field is from the Crustal Movement Observation Network of China‐I/II: 27 continuous stations observed since 1999; 56 campaign stations observed annually during 1998–2007; 1000 campaign stations observed in 1999, 2001, 2004, and 2007; 260 continuous stations operating since late 2010; and 2000 campaign stations observed in 2009, 2011, 2013, and 2015. We process these data and combine the solutions in a consistent reference frame with stations from the Global Strain Rate Model compilation, then invert for continuous velocity and strain rate fields. We update geodetic slip rates for the major faults (some vary along strike), and find that those along the major Tibetan strike‐slip faults are in good agreement with recent geological estimates. The velocity field shows several large undeforming areas, strain focused around some major faults, areas of diffuse strain, and dilation of the high plateau. We suggest that a new generation of dynamic models incorporating strength variations and strain‐weakening mechanisms is required to explain the key observations. Seismic hazard in much of the region is elevated, not just near the major faults.

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“…(a) Topography and deep seismic profiles used to constrain NCcrust (Black lines: geological boundary; blue lines: profiles 1–10 in Table ; pink lines: profiles 11–14 in Table ; yellow lines: profiles 15–48 in Table ; white dots: Receiver function interpretations for the Moho depth). (b) Coverage of the China continent by models of the Moho depth (deep seismic sounding: [ Li and Mooney , ; Li et al , ; Teng et al , ]; receiver functions: [ Y. H. Li et al , ; He et al , ; Wei et al , ]; tomography: [ Sun et al , , ; Gravity: Guo et al , ]; and crustal structure [ Gao et al , ; Li et al , ; Duan et al , ].…”

Section: Introductionmentioning

confidence: 99%

Seismic crustal structure of the North China Craton and surrounding area: Synthesis and analysis

2017

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We present a new digital model (NCcrust) of the seismic crustal structure of the Neoarchean North China Craton (NCC) and its surrounding Paleozoic‐Mesozoic orogenic belts (30°–45°N, 100°–130°E). All available seismic profiles, complemented by receiver function interpretations of crustal thickness, are used to constrain a new comprehensive crustal model NCcrust. The model, presented on a 0.25° × 0.25°grid, includes the Moho depth and the internal structure (thickness and velocity) of the crust specified for four layers (the sedimentary cover, upper, middle, and lower crust) and the Pn velocity in the uppermost mantle. The crust is thin (30–32 km) in the east, while the Moho depth in the western part of the NCC is 38–44 km. The Moho depth of the Sulu‐Dabie‐Qinling‐Qilian orogenic belt ranges from 31 km to 51 km, with a general westward increase in crustal thickness. The sedimentary cover is 2–5 km thick in most of the region, and typical thicknesses of the upper crust, middle crust, and lower crust are 16–24 km, 6–24 km, and 0–6 km, respectively. We document a general trend of westward increase in the thickness of all crustal layers of the crystalline basement and as a consequence, the depth of the Moho. There is no systematic regional pattern in the average crustal Vp velocity and the Pn velocity. We examine correlation between the Moho depth and topography for seven tectonic provinces in the North China Craton and speculate on mechanisms of isostatic compensation.

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Crustal thickness map of the Chinese mainland from teleseismic receiver functions

Cited by 197 publications

References 69 publications

Slip Model for the 25 November 2016 Mw 6.6 Aketao Earthquake, Western China, Revealed by Sentinel-1 and ALOS-2 Observations

Slip Model for the 25 November 2016 Mw 6.6 Aketao Earthquake, Western China, Revealed by Sentinel-1 and ALOS-2 Observations

Crustal Deformation in the India‐Eurasia Collision Zone From 25 Years of GPS Measurements

Seismic crustal structure of the North China Craton and surrounding area: Synthesis and analysis

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