2024-03-29T14:52:31Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1630712018-07-25T09:45:38Zcom_10261_82com_10261_8col_10261_461
Along-strike changes in the structure, seismicity, and topography of the south-central Taiwan fold-and-thrust belt inherited from the Eurasian margin
Brown, Dennis
Alvarez-Marrón, Joaquina
Biete, Cristina
Kuo-Chen, Hao
Camanni, Giovanni
Ho, Chun-Wei
Taiwan
eurasian margin
seismology
Studies of mountain belts worldwide show that along-strike changes are common in their foreland fold-and-thrust
belts. These are typically caused by processes related to fault reactivation and/or fault focusing along changes in
sedimentary sequences. The study of active orogens, like Taiwan, can also provide insights into how these processes
influence transient features such as seismicity and topography. In this paper, we trace regional-scale features from
the Eurasian continental margin in the Taiwan Strait into the south-central Taiwan fold-and-thrust belt. We then
present newly mapped surface geology, P-wave velocity maps and sections, seismicity, and topography to test the
hypothesis of whether or not these regional-scale features of the margin are contributing to along-strike changes
in structural style, seismicity, and topography in this part of the Taiwan fold-and-thrust belt. These data show that
the most important along-strike change takes place at the eastward prolongation of the upper part of the margins
necking zone, where there is a causal link between fault reactivation, involvement of basement in the thrusting,
concentration of seismicity, and the formation of high topography. On the area correlated with the necking zone,
the strike-slip reactivation of east-northeast striking extensional faults is causing sigmoidal offset of structures and
topography along two main zones. Here, basement is not involvement in the thrusting, there is weak focusing of
seismicity, and localized development of topography.We also show that there are important differences in structure,
seismicity, and topography between the margins shelf and its necking zone.
Peer Reviewed
2018-04-03T09:46:54Z
2018-04-03T09:46:54Z
2017-04-23
2018-04-03T09:46:54Z
póster de congreso
http://purl.org/coar/resource_type/c_6670
issn: 1029-7006
Geophysical Research Abstracts, 19: EGU2017-6079 (2017)
http://hdl.handle.net/10261/163071
Publisher's version
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open
European Geosciences Union