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| Titel |
The Moho structure beneath the tension area of the central Tibet by teleseismic P wave receiver functions |
| VerfasserIn |
Yaohui Duan, Xiaobo Tian, Xiaofeng Liang, Tao Xu, Zhiming Bai, Yun Chen, Xi Zhang, Zhen Liu, Gaohua Zhu, Chenglong Wu, Zhenbo Wu, Wei Li, Minling Wang, Xi Guo, Minghui Zhang, Beibei Zhou, Shitan Nie, Xiaopeng Zhou, Zhi Wei, Jiwen Teng |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250105745
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| Publikation (Nr.) |
 EGU/EGU2015-5298.pdf |
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| Zusammenfassung |
| The Tibetan Plateau, with a crustal thickness twice of the normal thickness and an average
elevation of 5km, is generated by the continental-continental collision between the India and
Eurasian plates as well as the subsequent convergence. The central Tibet filled
with a large quantity of normal faults and eastward escaped conjugated strike-slip
faults which represent the tension function is thought to be a deformation crush
zone between the colliding plates. In order to understand the relationship between
the deep structure of the plateau and the surface texture evolution and to build the
connection of the subduction of the India plate and shallow surface response, we
build 53 broadband seismic stations around the Bangong-Nujiang Suture (named
SANDWICH). In this paper, we calculate 3851 high signal-to-noise receiver functions of
teleseismic P wave from the SANDWICH broad-band waveforms, and obtain the
images of Moho structure of 7 profiles using the common conversion points time to
depth migration. Our results show that the average crustal thickness of the central
Tibet is 60-70km and crustal thickness of the south of the Bangong-Nujiang Suture
is thicker than that of the north. Besides, this part of the plateau is divided into
several blocks with different crustal thickness by the normal faults, eastward escaped
conjugated strike-slip faults and the Bangong-Nujiang Suture despite the surface
is flat which implying that there are some relationships between the deep offset
and the shallow faults .We also find the negative amplitude in the depth of 20km
around, which probably be the interface of the brittle upper crust and the ductile
middle crust. Based on the result, we are willing to investigate how the surface
faults tension and the deep tension are connected through the ductile middle crust. |
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