NDLI: Fine structure of Pn velocity beneath Sichuan-Yunnan region

Content Provider	Springer Nature Link
Author	Huang, Jinli Song, Xiaodong Wang, Suyun
Copyright Year	2003
Abstract	We use 23298 Pn arrival-time data from Chinese national and provincial earthquake bulletins to invert fine structure of Pn velocity and anisotropy at the top of the mantle beneath the Sichuan-Yunnan and its adjacent region. The results suggest that the Pn velocity in this region shows significant lateral variation; the Pn velocity varies from 7.7 to 8.3 km/s. The Pn-velocity variation correlates well with the tectonic activity and heat flow of the region. Low Pn velocity is observed in southwest Yunnan, Tengchong volcano area, and the Panxi tectonic area. These areas have very active seismicity and tectonic activity with high surface heat flow. On the other hand, high Pn velocity is observed in some stable regions, such as the central region of the Yangtze Platform; the most pronounced high velocity area is located in the Sichuan Basin, south of Chengdu. Pn anisotropy shows a complex pattern of regional deformation. The Pn fast direction shows a prominent clockwise rotation pattern from east of the Tibetan block to the Sichuan-Yunnan diamond block to southwest Yunnan, which may be related to southeastward escape of the Tibetan Plateau material due to the collision of the Indian Plate to the Eurasia Plate. Thus there appears to be strong correlation between the crustal deformation and the upper mantle structure in the region. The delay times of events and stations show that the crust thickness decreases from the Tibetan Plateau to eastern China, which is consistent with the results from deep seismic sounding.
Starting Page	201
Ending Page	209
Page Count	9
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	46
Issue Number	2
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2003-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	Sichuan-Yunnan region Pn velocity Seismic tomography Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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