scholarly journals Crustal structure of the northeastern Tibetan plateau, the Ordos block and the Sichuan basin from ambient noise tomography

2010 ◽  
Vol 23 (5) ◽  
pp. 465-476 ◽  
Author(s):  
Yong Zheng ◽  
Yingjie Yang ◽  
Michael H. Ritzwoller ◽  
Xiufen Zheng ◽  
Xiong Xiong ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Crustal Structure ◽  
Sichuan Basin ◽  
Ambient Noise ◽  
Ambient Noise Tomography ◽  
Ordos Block ◽  
Northeastern Tibetan Plateau ◽  
The Sichuan Basin

Crustal Structure of the Northeastern Tibetan Plateau from the Southern Tarim Basin to the Sichuan Basin, China

2013 ◽  
Vol 584 ◽  
pp. 191-208 ◽  
Author(s):  
Youxue Wang ◽  
Walter D. Mooney ◽  
Xuecheng Yuan ◽  
Nihal Okaya
Keyword(s):  
Tibetan Plateau ◽  
Crustal Structure ◽  
Tarim Basin ◽  
Sichuan Basin ◽  
Northeastern Tibetan Plateau ◽  
The Sichuan Basin

Sedimentary structure of the Sichuan Basin derived from seismic ambient noise tomography

2020 ◽  
Author(s):  
Xin Xia ◽  
Zhiwei Li ◽  
Feng Bao ◽  
Jun Xie ◽  
Yutao Shi ◽  
...  
Keyword(s):  
Wave Velocity ◽  
Sichuan Basin ◽  
Ambient Noise ◽  
Large Scale ◽  
Velocity Model ◽  
S Wave ◽  
Ambient Noise Tomography ◽  
Ground Acceleration ◽  
The Sichuan Basin ◽  
Sedimentary Layer

Summary Determining a detailed 3-D velocity model with high resolution for the sedimentary layer in the Sichuan Basin is potentially beneficial both to the industrial oil/gas exploration and earthquake hazards mitigation. In this study, we apply the ambient noise tomography method to construct a 3-D S-wave velocity model. This model focuses on the sedimentary layer of the Sichuan Basin, with a 0.3° × 0.3° grid precision. Dispersion curves of both group and phase velocities of Rayleigh wave at 4 to 40 s periods are utilized, which are extracted from 87 broadband stations in the Sichuan Basin and the surrounding areas. The 3-D model reveals a thick sedimentary layer of the Sichuan Basin with S-wave velocity ranging from ∼2.0 km/s to 3.4 km/s. The sediment thickness in the margins of the Sichuan Basin is generally greater than the typical values of 6–10 km in the central areas due to surrounding orogenic activities, with a maximum depth of ∼13 km in the northwestern margin. Moreover, a prominent low S-wave velocity anomaly in the margins may be caused by the sediment accumulations from large-scale landslides and pronounced denudation of the surrounding orogenic belts. Major geologic units in the sedimentary layer are delineated in this study. The S-wave velocity values within each geologic unit and their bottom interfaces are obtained. Based on our model, we calculate synthetic ground motions for the 2013 Lushan earthquake and obtain the distribution of the peak ground acceleration from the earthquake epicenter to the western Sichuan Basin. The result clearly illustrates the basin amplification effect on the seismic waves.

Radial anisotropy in the crust beneath the northeastern Tibetan Plateau from ambient noise tomography

2015 ◽  
Vol 26 (6) ◽  
pp. 864-871 ◽  
Author(s):  
Jing Tan ◽  
Hongyi Li ◽  
Xinfu Li ◽  
Ming Zhou ◽  
Longbin Ouyang ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Ambient Noise ◽  
Ambient Noise Tomography ◽  
Northeastern Tibetan Plateau ◽  
Radial Anisotropy
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