Three-dimensional P velocity structures of the lithosphere beneath Taiwan from the analysis of TAIGER and related seismic data sets

Hao Kuo-Chen, Francis T. Wu, Steven W. Roecker

研究成果: 雜誌貢獻期刊論文同行評審

125 引文 斯高帕斯(Scopus)

摘要

The convergence of the Philippine Sea and the Eurasian plates in the Taiwan region led to the formation of a young collisional mountain between two subduction zones of nearly orthogonal polarities. The geological processes underlying the collision and its relation to subduction are the primary targets of TAIGER (Taiwan Integrated Geodynamic Research) project. Newly acquired passive and active sources data on land, supplemented by ocean bottom as well as permanent seismic network data, are used to derive a new 3-D tomographic velocity model. Using the 7.5km/sec contour as a marker for crustal deformation, two trend-parallel "roots," one under the Central Range with a maximum depth of 55km and the other under the Coastal Range at 40km, are found to extend from southern to central (∼24N) Taiwan. Between the two roots and lying approximately beneath the Longitudinal Valley, the 7.5km/sec contour rises to 25km depth. In the upper mantle, a high velocity zone, east-dipping and its upper surface coinciding with a Wadati-Benioff zone in the south (∼22.8N), becomes near vertical and ill-defined in the north (∼23.9N). The crustal deformation as defined by the "roots" and the along-trend variations of the upper mantle structures under Taiwan provide key information for the orogeny. With the thickening of crust to 55km or more processes such as eclogitization and delamination may come into play.

原文???core.languages.en_GB???
文章編號B06306
期刊Journal of Geophysical Research: Solid Earth
117
發行號6
DOIs
出版狀態已出版 - 1 6月 2012

指紋

深入研究「Three-dimensional P velocity structures of the lithosphere beneath Taiwan from the analysis of TAIGER and related seismic data sets」主題。共同形成了獨特的指紋。

引用此