National Taiwan Ocean University Institutional Repository:Item 987654321/40679
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题名: Crustal resistivity anomalies beneath central Taiwan imaged by a broadband magnetotelluric transect
作者: Edward Bertrand
Chow-Son Chen
Chien-Chih Chen
Chih-Wen Chiang
Hun-Lun Shu
Wei-Hsuan Chiu
Martyn J. Unsworth
贡献者: 國立臺灣海洋大學:應用地球科學研究所
关键词: Constrained inversion
Magnetotelluric method
Crustal electrical conductor
Crustal fluid
Taiwan orogeny
日期: 2007-03
上传时间: 2017-02-06T03:37:18Z
出版者: Terrestrial, Atmospheric and Oceanic Sciences
摘要: Abstract: The Taiwan orogeny is young and presently very active. To improve understanding of the tectonics of Taiwan, especially the present of fluid of interconnected fluids such as water and partial melts in the Earth°Ps crust, transect across the central island of Taiwan by using broadband magneto-telluric (MT) soundings was made from 1995 - 2006. More than 80 MT stations were surveyed around this transect and a profile almost perpendicular to the regional strike of Taiwan was obtained. A 2-D constrained inversion was implemented and included static shift, topography and the ocean effect. This resistivity model is characterized by three main conductive anomalies located beneath the Coastal Plains, Central Range and Longitudinal Valley. Correlation of the conductors to the seismicity, the heat flow and surface geology of Taiwan suggest that the Coastal Plain conductor represents fluids, the Central Range conductor reflects both fluids and the effect of enhanced temperature, and the Longitudinal Valley conductor depicts the suture zone of the plates°P boundary, respectively. These lo resistivity zones could represent zones of reduced viscosity that may control the deformation of this active orogen. The GPS observations of a general motion in Taiwan area support this tectonic implication.
關聯: 18(1)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40679
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