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New geomorphic data on the active Taiwan orogen: A multisource approachA multisource and multiscale approach of Taiwan morphotectonics combines different complementary geomorphic analyses based on a new elevation model (DEM), side-looking airborne radar (SLAR), and satellite (SPOT) imagery, aerial photographs, and control from independent field data. This analysis enables us not only to present an integrated geomorphic description of the Taiwan orogen but also to highlight some new geodynamic aspects. Well-known, major geological structures such as the Longitudinal Valley, Lishan, Pingtung, and the Foothills fault zones are of course clearly recognized, but numerous, previously unrecognized structures appear distributed within different regions of Taiwan. For instance, transfer fault zones within the Western Foothills and the Central Range are identified based on analyses of lineaments and general morphology. In many cases, the existence of geomorphic features identified in general images is supported by the results of geological field analyses carried out independently. In turn, the field analyses of structures and mechanisms at some sites provide a key for interpreting similar geomorphic featues in other areas. Examples are the conjugate pattern of strike-slip faults within the Central Range and the oblique fold-and-thrust pattern of the Coastal Range. Furthermore, neotectonic and morphological analyses (drainage and erosional surfaces) has been combined in order to obtain a more comprehensive description and interpretation of neotectonic features in Taiwan, such as for the Longitudinal Valley Fault. Next, at a more general scale, numerical processing of digital elevation models, resulting in average topography, summit level or base level maps, allows identification of major features related to the dynamics of uplift and erosion and estimates of erosion balance. Finally, a preliminary morphotectonic sketch map of Taiwan, combining information from all the sources listed above, is presented.
Document ID
19950054989
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Deffontaines, B.
(Univ. Pierre et Marie Curie Paris, France)
Lee, J.-C.
(Univ. Pierre et Marie Curie Paris, France)
Angelier, J.
(Univ. Pierre et Marie Curie Paris, France)
Carvalho, J.
(Univ. Pierre et Marie Curie Paris, France)
Rudant, J.-P.
(Univ. Pierre et Marie Curie Paris, France)
Date Acquired
August 16, 2013
Publication Date
October 10, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: B10
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A86588
Distribution Limits
Public
Copyright
Other

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