青藏高原板内地震震源深度分布规律及其成因

罗文行; 李德威; 汪校锋

Volume 33 Issue 5

Sep. 2008

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LUO Wen-xing, LI De-wei, WANG Xiao-feng, 2008. Focal Depth and Mechanism of Intraplate Earthquakes in the Qinghai-Tibet Plateau. Earth Science, 33(5): 618-626.

Citation:

LUO Wen-xing, LI De-wei, WANG Xiao-feng, 2008. Focal Depth and Mechanism of Intraplate Earthquakes in the Qinghai-Tibet Plateau. Earth Science, 33(5): 618-626.

LUO Wen-xing, LI De-wei, WANG Xiao-feng, 2008. Focal Depth and Mechanism of Intraplate Earthquakes in the Qinghai-Tibet Plateau. Earth Science, 33(5): 618-626.

Citation:

LUO Wen-xing, LI De-wei, WANG Xiao-feng, 2008. Focal Depth and Mechanism of Intraplate Earthquakes in the Qinghai-Tibet Plateau. Earth Science, 33(5): 618-626.

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Focal Depth and Mechanism of Intraplate Earthquakes in the Qinghai-Tibet Plateau

LUO Wen-xing^{1, 2
,},
LI De-wei^{1, 2
,
,},
WANG Xiao-feng²

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Research Center of Tibetan Plateau, China University of Geosciences, Wuhan 430074, China

Received Date: 2008-01-27
Publish Date: 2008-09-25

Abstract

Abstract

The Qinghai-Tibet plateau intraplate earthquakes are mainly shallow earthquakes, and basically no earthquakes happens in the lower crust. Earthquakes mostly distribute in the range of 15-40 km in depth, basically within the middle crust and concentrate at the depth of 30-33 km as an advantage layer related to the crustal stratification. On the South and North of the plateau, the focal surfaces slightly dip to the center. Some earthquakes concentrate within the range of 70-100 km depth, which may be associated with the detachment between crust and mantle. The intraplate earthquakes in the central Qinghai-Tibet are closely related to the normal faults which are dominant earthquake faults. In short, the Qinghai-Tibet plateau seismic activity distributes along the brittle-ductile transition zone between the brittle upper crust layer and the ductile lower crust. Intraplate seismic activity is a continental dynamic process, irrelevant to plate collision and subduction. The seismogenic layers from shallow to deep are separately the result of ductile-brittle transition, detachment and decoupling between basement and cover; ductile lower crust and brittle upper crust, and ductile lower crust and brittle upper mantle.
- the Qinghai-Tibet plateau,
- intraplate earthquake,
- focal depth,
- seismogenic layer

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References(42)

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Focal Depth and Mechanism of Intraplate Earthquakes in the Qinghai-Tibet Plateau

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