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Publication details

Document type
Journal articles

Document subtype
Full paper

Title
Morphotectonics in a low tectonic rate area: Analysis of the southern Portuguese Atlantic coastal region

Participants in the publication
Paula M. Figueiredo (Author)
Thomas K. Rockwell (Author)
João Cabral (Author)
Dep. Geologia
IDL - Instituto Dom Luiz
Cristina Ponte Lira (Author)
Dep. Geologia
IDL - Instituto Dom Luiz

Scope
International

Refereeing
Yes

Summary
South Portugal is characterized by low tectonic rates (<0.3 mm/a), with infrequent large seismicity. Recent studies indicate a coastal region in southwest Portugal uplifting at higher rates (0.11 ± 0.01 mm/a) than the remaining southern portion of Portugal (~0.04 mm/a); however, the mechanisms that drive this uplift are poorly understood. With the purpose of investigating the regional Quaternary deformation and its patterns, as well as the difference in the uplift rate, 77 exorheic drainage basins along 460 km of the southern Portuguese coastline were analysed through the application of geomorphic indices. In this study we applied stream channel sinuosity S, basin relief ratio Rh, elongation Re, basin shape ratio Bs, valley height-width ratio V f , basin asymmetry factor AF, hypsometry HI and, the stream-length gradient index SL, and we propose the terminal basin shape index TBS. This study aims to (1) identify Quaternary deformation along presumed tectonic structures; (2) recognize uplift or subsidence along the coastline; and (3) test the application of geomorphic indices in low deformation rate environments. The cross-correlation of results led to the recognition of the São Teotónio-Aljezur-Sinceira fault system and the São Marcos-Quarteira Fault as major regional Quaternary faults, as well as to the interpretation of Quaternary activity for other structures. Spatial differences in uplift rates are identified through basin shape indices and valley height-width ratios, even for low vertical motion rates, whereas other indices were found to be not as sensitive to variations in uplift rate.

Date of Submisson/Request
2017-07-03
Date of Acceptance
2018-02-14
Date of Publication
2019-02

Institution
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Where published
Geomorphology

Publication Identifiers
ISSN - 0169-555X

Publisher
Elsevier BV

Volume
326

Number of pages
19
Starting page
132
Last page
151

Document Identifiers
DOI - https://doi.org/10.1016/j.geomorph.2018.02.019
URL - http://dx.doi.org/10.1016/j.geomorph.2018.02.019

Keywords
Portugal Uplift Morphotectonic analysis Low tectonic rate


Export

APA
Paula M. Figueiredo, Thomas K. Rockwell, João Cabral, Cristina Ponte Lira, (2019). Morphotectonics in a low tectonic rate area: Analysis of the southern Portuguese Atlantic coastal region. Geomorphology, 326, 132-151. ISSN 0169-555X. eISSN . http://dx.doi.org/10.1016/j.geomorph.2018.02.019

IEEE
Paula M. Figueiredo, Thomas K. Rockwell, João Cabral, Cristina Ponte Lira, "Morphotectonics in a low tectonic rate area: Analysis of the southern Portuguese Atlantic coastal region" in Geomorphology, vol. 326, pp. 132-151, 2019. 10.1016/j.geomorph.2018.02.019

BIBTEX
@article{44243, author = {Paula M. Figueiredo and Thomas K. Rockwell and João Cabral and Cristina Ponte Lira}, title = {Morphotectonics in a low tectonic rate area: Analysis of the southern Portuguese Atlantic coastal region}, journal = {Geomorphology}, year = 2019, pages = {132-151}, volume = 326 }