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The influence of inherited continental margin structures on the stress and strain fields of the south-central Taiwan fold-and-thrust belt
CSIC, ICTJA, Inst Earth Sci, Lluis Sole i Sabaris S-N, E-08028 Barcelona, Spain;Univ Barcelona, Dept Dinam Terra & Ocea, Barcelona 02028, Spain.
CSIC, ICTJA, Inst Earth Sci, Lluis Sole i Sabaris S-N, E-08028 Barcelona, Spain;Natl Cent Univ, Dept Earth Sci, Taoyuan 32001, Taiwan.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.ORCID iD: 0000-0002-0789-5949
CSIC, ICTJA, Inst Earth Sci, Lluis Sole i Sabaris S-N, E-08028 Barcelona, Spain.
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2019 (English)In: Geophysical Journal International, ISSN 0956-540X, E-ISSN 1365-246X, Vol. 219, no 1, p. 430-448Article in journal (Refereed) Published
Abstract [en]

In this paper we test whether or not structural and morphological features inherited from the Eurasian continental margin are affecting the contemporary stress and strain fields in south-central Taiwan. Principal stress directions (sigma(1), sigma(2) and sigma(3)) are estimated from the inversion of clustered earthquake focal mechanisms and the direction of the maximum compressive horizontal stress (S-H) is calculated throughout the study area. From these data the most likely fault plane orientations and their kinematics are inferred. The results of the stress inversion are then discussed together with the directions of displacement, compressional strain rate and maximum shear strain rate derived from GPS data. These data show that there is a marked contrast in the direction of SH from north to south across the study area, with the direction of SH remaining roughly subparallel to the relative plate motion vector in the north, whereas in the south it rotates nearly 45 degrees counter-clockwise. The direction of the horizontal maximum compression strain rate (epsilon(H)) and associated maximum shear planes, together with the displacement field display an overall similar pattern between them, although undergoing a less marked rotation. We interpret the southward change in the SH, eH and the dextral maximum shear plane directions, together with that of the horizontal displacement field to be related to the reactivation of east-northeast striking faults inherited from the rifted Eurasian margin and to the shelf/slope break. Inherited faults in the basement are typically reactivated as strike-slip faults, whereas newly formed faults in the fold-and-thrust belt are commonly thrusts or oblique thrusts. Eastwards, the stress inversions and strain data show that the western flank of the Central Range is undergoing extension in the upper crust. SH in the Central Range is roughly parallel to the relative plate convergence vector, but in southwestern Taiwan it undergoes a marked counter-clockwise rotation westwards across the Chaochou fault. Farther north, however, there is no significant change across the Lishan fault. This north to south difference is likely due to different margin structures, although local topographic effects may also play a role.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2019. Vol. 219, no 1, p. 430-448
Keywords [en]
Asia, Seismicity and tectonics, Crustal structure, Dynamics: seismotectonics, Dynamics and mechanics of faulting
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-394186DOI: 10.1093/gji/ggz296ISI: 000484124800025OAI: oai:DiVA.org:uu-394186DiVA, id: diva2:1359468
Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-09Bibliographically approved

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