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Apports de l'interférométrie radar différentielle à la tectonique active de Taiwan

Abstract : Taiwan island results from the ongoing collision between the Philippine Sea plate and the Eurasian plate. With the aim of investigating the present-day tectonics of the growing Taiwan mountain belt, we use differential SAR interferometry technique (D- INSAR) in complement of other existing methods. This technique can provide deformation map of the ground with a spatial resolution of a few tens of meters and a precision of a few millimeters, spanning periods of one day to several years. After a comprehensive review of principles and limits of the method and an estimation of its potential in Taiwan, D-INSAR is applied, with ERS data, on two case examples of horizontal shortening in this convergent orogen. (1) The Mw=7.6, 1999 Chi-Chi earthquake reactivated the Chelungpu fault, a major thrust of the Taiwan Western Foothills. The map of the coseismic displacement field generated by D-INSAR and calibrated by GPS allows us a precise spatial analysis of the footwall deformation showing small deformations on nearby faults triggered by the earthquake (Changhua and Tuntzuchiao faults). Comparison with predicted displacements from published models of slip distribution of the earthquake highlights inadequacies of these models. (2) D-INSAR approach reveals a regular uplift of the Tainan anticline (1.5 cm/year during the period 1993-2000), which belongs to the coastal plain of southwestern Taiwan. This actively growing anticline, with N-S axis, corresponds to the deformation front which is propagating westward on the Chinese continental margin. A structural model combining a "pop-up" structure with an E-W lateral ramp accounts for deformation and morphology of the anticline.
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Contributor : Erwan Pathier <>
Submitted on : Friday, November 19, 2004 - 6:39:43 PM
Last modification on : Wednesday, December 9, 2020 - 3:04:57 PM


  • HAL Id : tel-00007464, version 1


Erwan Pathier. Apports de l'interférométrie radar différentielle à la tectonique active de Taiwan. Géologie appliquée. Université de Marne la Vallée, 2003. Français. ⟨tel-00007464⟩



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