The preliminary interpretation of deep seismic sounding in western Yunnan

Lin, Zhong-Yang; Hu, Hong-Xiang; Zhang, Wenbin; Zhang, Huifen; He, Zheng-Qin; Lin, Zhen-Ming; Qiu, Tao-Xing

doi:10.1007/bf02651822

Cited by 25 publications

(22 citation statements)

References 1 publication

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“…6a and 7a, respectively). The depth 17-25 km given here for the upper crust/middle crust boundary is very close to that (17-25.5 km) reported by Lin et al (1993) for the same boundary along the SM-ZD profile. Except for the SM-ZD profile, we find that the middle/lower crust discontinuity lies generally at a depth of 23-32 km.…”

Section: Fig 8 Layered P-wave Velocity Models Beneath the Menglian-supporting

confidence: 88%

“…2). The analysis of this phase reveals that the P-wave velocity varies rapidly in the deepest part of the crust (Yan et al, 1985;Hu et al, 1986;Kan et al, 1986;Lin et al, 1993). Vp changes rapidly to 7.8 km/s and even to a value of 8.0 km/s and exceptionally 8.2 km/s in the top of the mantle at some locations.…”

Section: Reflection/refraction Events and Velocity Model Buildingmentioning

confidence: 99%

“…Layered P-wave velocity models beneath the Simao-Zhongdian profile (SM-ZD). Same legend as Fig.6, although the velocity model represented in the top is due to Lin et al (1993).…”

Section: Fig 8 Layered P-wave Velocity Models Beneath the Menglian-mentioning

confidence: 99%

“…Previous interpretations based on a homogeneous-layering assumption produced some onedimensional (1-D) crustal velocity models (Yan et al, 1985;Hu et al, 1986;Kan et al, 1986;Lin et al, 1993). The average P-wave velocity of the crust is about 6.2 km/s and its thickness varies between approximately 58 km under the northern part of Yunnan and 32 km beneath its southern border.…”

Section: Introductionmentioning

confidence: 99%

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Crustal and upper mantle velocity structure in Yunnan, Southwest China

Zhang

Wang

2009

Tectonophysics

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Four wide-angle seismic profiles acquired in analogue form in the 1980's from Yunnan, Southwest China, are re-digitized and re-interpreted for a detailed P-wave velocity structure of the crust and lithospheric mantle. The results reveal that the crust can be divided roughly into upper, middle and lower crusts with bottom depths of 17-25, 26-33, and 33-56 km, respectively. The Moho depth varies from 56 km in the north of Yunnan to about 33 km in the southern part, and from 38-40 km in the west of Yunnan to 42 km in the eastern zone. The velocity anisotropy in the lower crust is of 4.4 %, in contrast with the very low values estimated for the upper-middle crust, which are close to 1.6%. This suggests that the surface deformation in the Yunnan area is decoupled from the lower crustal flow. The seismic velocity discrepancy along different azimuths in the lower crust and upper mantle beneath the profiling cross points leads to a flow regime in the north-south direction that agrees with contemporary tectonic deformation, and also provides evidence for the rotation of the lower crust-upper mantle medium around the east Himalayan foreland. High-velocity anomalies in the lower crust might be explained as intrusions of mantle material or remaining patches of ancient oceanic crust.

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Section: Fig 8 Layered P-wave Velocity Models Beneath the Menglian-supporting

confidence: 88%

Section: Reflection/refraction Events and Velocity Model Buildingmentioning

confidence: 99%

“…Layered P-wave velocity models beneath the Simao-Zhongdian profile (SM-ZD). Same legend as Fig.6, although the velocity model represented in the top is due to Lin et al (1993).…”

Section: Fig 8 Layered P-wave Velocity Models Beneath the Menglian-mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crustal and upper mantle velocity structure in Yunnan, Southwest China

Zhang

Wang

2009

Tectonophysics

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“…We determine the ray parameter from the 151 event depth and epicentral distance and use average crustal P-wave velocities of 6.2 and 152 6.4 km/s (Lin et al, 1993;Li and Mooney, 1998;Wang et al, 2003). At each station, 153…”

Section: For Definitions): P H S Ppp H S and Pps H S (Or Psp H S)mentioning

confidence: 99%

Structure of the crust beneath the southeastern Tibetan Plateau from teleseismic receiver functions

Rondenay

Hilst

2007

Physics of the Earth and Planetary Interiors

244

205

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S Wave Velocity Structure Beneath Digital Seismic Stations of Yunnan Province Inferred from Teleseismic Receiver Function Modeling

Wu¹,

Ming²,

Wang³

2001

Chinese J of Geophysics

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The S wave velocity structure within the depth of 0-100 km beneath digital seismic stations of Yunnan Province was obtained from teleseismic receiver function modeling. The results show that the crustal thickness changes greatly in Yunnan, reaching about 62 km in Zhongdian and Lijiang, and decreasing to 32-34 km in Jinghong, Simao and Changyuan in south. The thick crust extends from northwest to southeast, decreases in thickness and range, and is about 42 km thick around Tonghai. Its shape and range consist with Chuandian diamond block bounded by Xiaojiang and Yuanjiang faults. In the eastern and southern region, the crust is relatively thin, and the velocity contrast across Moho is obvious. In the areas with great variation of crustal thickness or thick crust area, the Moho is characterized by transition zone with high velocity gradient. In Yunnan region, S wave velocity structures show strong horizontal heterogeneity. Above the depth of 10 km, the S wave velocity in north area is obviously lower than that in south area, while within the depth of 10-20 km, the S wave velocity in north is higher than that in south. The velocity interface within crust is discontinuous, and the depth and range of lower velocity zones change with different seismic stations. There is no obvious crustal low velocity zone beneath nearly half of the stations. Influenced by the upper mantle in south area, within the depth of 40-50 km, S wave velocity in south area is higher than that in north, high velocity area extends to north, and the shape of low velocity zone tends to consist with Chuandian diamond block. The upper mantle velocity distribution within the depth of 70-80 km seems to be correlated to the distribution of strong earthquakes.

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The preliminary interpretation of deep seismic sounding in western Yunnan

Cited by 25 publications

References 1 publication

Crustal and upper mantle velocity structure in Yunnan, Southwest China

Crustal and upper mantle velocity structure in Yunnan, Southwest China

Structure of the crust beneath the southeastern Tibetan Plateau from teleseismic receiver functions

S Wave Velocity Structure Beneath Digital Seismic Stations of Yunnan Province Inferred from Teleseismic Receiver Function Modeling

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