The depth of Moho in the mainland of China

Zeng, Ruifeng; Sun, Weiguo; Mao, Tong-En; Lin, Zhong-Yang; Hu, Hong-Xiang; Chen, Guang‐Ying

doi:10.1007/bf02650567

Cited by 17 publications

(17 citation statements)

References 3 publications

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“…In the East China Sea and South China Sea (including the Hainan Island) the crustal thickness is 26±28 km. More recent crustal thickness studies (LI and MOONEY, 1997) in general con®rm previous results (ZENG et al, 1995). The new studies also reveal an intermediate ma®c lower crust with P-wave velocities of 6.9±7.0 km/sec.…”

Section: Major Geophysical Features In the Scbsupporting

confidence: 69%

“…The Yangtze platform is one of the three oldest stable platforms in the China continent (the other two are the Sino±Korea platform and the Tarim Basin) (ZENG et al, 1995). The Sino±Korean platform solidi®ed in the early middle Proterozoic (1700 Ma), whereas the Yangtze and Tarim platforms solidi®ed in the late Proterozoic (700 Ma).…”

Section: Tectonics Within the Scbmentioning

confidence: 99%

“…Mainland China can be divided into eight blocks, based on the crustal thickness expressed by Moho depth variations. The Moho depth within any one block is relatively uniform; however, it changes abruptly from one block to another (ZENG et al, 1995). The southeastern China fold belt consists of exotic terrains that attached to the Yangtze platform during the Craton (460 Ma in Ordovician) and the Variscan (320 Ma in Carboniferous) orogenies.…”

Section: Major Geophysical Features In the Scbmentioning

confidence: 99%

“…The SCB can be divided into 4 regions with dierent crustal thickness. From west to east, they are: (1) the Upper Yangtze platform, 40±46 km; (2) the Xuefeng Mountain transition belt in N±S direction, 34±38 km; (3) the Lower Yangtze platform, 32±34 km; and (4) the Southeast China coast, 30±32 km (ZENG et al, 1995). The Lower Yangtze platform, combined with part of the southeastern China fold belt, dominates the SCB with an averaged crustal thickness of 33 km (Fig.…”

Section: Major Geophysical Features In the Scbmentioning

confidence: 99%

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Stable Continental Region Earthquakes in South China

Liu

2001

Pure appl. geophys.

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Ð This paper reviews some remarkable characteristics of earthquakes in a Stable Continental Region (SCR) of the South China Block (SCB). The kernel of the SCB is the Yangtze platform solidi®ed in late Proterozoic time, with continental growth to the southeast by a series of fold belts in Paleozoic time. The facts that the deviatoric stress is low, the orientations of the major tectonic features in the SCB are substantially normal to the maximum horizontal principal stress, and a relatively uniform crust, seem to be the major reasons for lack of signi®cant seismicity in most regions of the SCB. Earthquakes in this region are mainly associated with three seismic zones: (1) the Southeast China Coast seismic zone related to Guangdong-Fujian coastal folding belt (associated with Eurasia-Philippine Sea plate collision); (2) the Southern Yellow Sea seismic zone associated with continental shelf rifts and basins; and (3) the Downstream Yangtze River seismic zone spatially coinciding with Tertiary rifts and basin development. All three seismic zones are close to one or two major economic and population centers in the SCB so that they pose signi®cant seismic hazards. Earthquake focal mechanisms in the SCB are consistent with strikeslip to normal faulting stress regimes. Because of the global and national economic signi®cance of the SCB and its dense population, the seismic hazard of the region is of outstanding importance. Comparing the SCB with another less developed region, a pending earthquake with the same size and tectonic setting would cause substantially more severe social and economic losses in the SCB. This paper also compiles an inventory of historic moderate to great earthquakes in the SCB; most of the data are not widely available in English literature.

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Section: Major Geophysical Features In the Scbsupporting

confidence: 69%

Section: Tectonics Within the Scbmentioning

confidence: 99%

Section: Major Geophysical Features In the Scbmentioning

confidence: 99%

Section: Major Geophysical Features In the Scbmentioning

confidence: 99%

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Stable Continental Region Earthquakes in South China

Liu

2001

Pure appl. geophys.

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“…Discontinuity between crust and mantle called moho discontinuity is an important one for geodynamics such as crustal evolution, tectonic activities and so on, in addition to the correcting gravity for the crustal effects, seismic 30 tomography and geothermal modeling. The depth of moho or called crust thickness varies greatly over small length scales and has significant effects on fundamental mode surface waves(Ueli Meier et al,2007).There are several methods to get moho depth, such as deep seismic sounding profile for china continent (Zeng et al,1995), inverting satellite gravity data to get whole global crust and lithophere thickness (Fang et al,1999), inverting Bouguer gravity and topography data to get moho depth for china 35 and its adjants (Huang et al,2008;Guo et al, 2012),inverting receiver function to get moho depth and Possion's ratio for china continent (Chen et al,2010;Zhu,2012 (Laske et al,2013;Stolk, et al, 2013) are based on refraction and reflection seismology as well as receiver function studies. As a consequence, resolution and consistence among different crust models are high in regions with good data coverage and uncomplicated structure but in 40 regions with poor or no data coverage or complicated structure crustal thickness estimates are largely extrapolated.…”

Section: Introductionmentioning

confidence: 99%

Inverting Rayleigh surface wave velocities for eastern Tibet and western Yangtze craton crustal thickness based on deep learning neural networks

Cheng

Liu

2016

Preprint

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Abstract.Crustal thickness is an important factor affecting lithosphere structure and therefore deep geodynamics. In this paper, we propose to apply deep learning neural networks called stacked sparse 10 auto-encoder to obtain crustal thickness for eastern Tibet and western Yangtze craton. Firstly taking phase and group velocities simultaneously as input and theoretical crustal thickness as output, we construct twelve deep neural networks trained by 70,000 and tested by 30,000 theoretical models. We then invert observed phase and group velocities by these twelve neural networks. Based on test errors and misfits with other crustal thickness models, we select the optimized one as crustal thickness for 15 study areas. Compared with other ways detected crustal thickness such as seismic wave reflection and receiver function, we conclude that deep learning neural network is a promising, believable and inexpensive tool for geophysical inversion.

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A Study on the Crust Phases of Deep Seismic Sounding and the Fine Crust Structure in the Northeast Margin of Tibetan Plateau

Jia¹,

Zhang²

2008

Chinese J of Geophysics

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In this paper the fine crust structures of the different tectonic units in the northeastern margin of Tibetan plateau are investigated in detail by means of comprehensive analyses of the crust phases on the recording sections of deep seismic sounding experiments in this region and comparing the observed seismic recording sections with the synthetic seismograms computed by the reflectivity method. The results reveal that the crust structures in the northern and southern parts of this region separated by the western Qinling fold zone are quite different, and the crust structures are characterized respectively by stable Linxia‐Lanzhou Cenozoic basin in the northern part and by strongly rebuilt Songpan‐Garzê tectonic block in the southern part. The results also show that Songpan‐Garzê tectonic block was rebuilt as two types of crust structures, i.e. the type of the shrunken Zoigê upland basin and the type of the folded orogenic zone in the basin margin. It is also revealed that the fractured and relaxed structure widely exists in the mid and low crust in the northeastern margin of Tibetan plateau, which is characterized by alternative low and high velocity structures or low velocity distributions. This structural feature appears especially obvious in the suture zone and the orogenic zone, which implies there are important places of thickening of the crust and rheological slip motion. The crust deformation and geodynamic process are discussed based on the 2D‐velocity structure of the crust and GPS result obtained in this region.

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The depth of Moho in the mainland of China

Cited by 17 publications

References 3 publications

Stable Continental Region Earthquakes in South China

Stable Continental Region Earthquakes in South China

Inverting Rayleigh surface wave velocities for eastern Tibet and western Yangtze craton crustal thickness based on deep learning neural networks

A Study on the Crust Phases of Deep Seismic Sounding and the Fine Crust Structure in the Northeast Margin of Tibetan Plateau

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