Abstract:
Using three different approaches (fault plane fitting, 3D crater rim palinspatic restorations and fault scarps morphometric analysis) we investigate the geometry and degradation history of Martian normal faults in two distinct areas. The three independent methods produce similar results, indicating that the average dip angle of the normal faults on these two locations is probably below the value that is usually assumed for Mars (~60°). Our best estimate for this average dip angle is 46.8 ± 9.8°, which is a value comparable with the mean dip angle inferred on Earth for seismically active normal faults. This lower average dip angle implies that all the rift strain estimates performed until now might be underestimated. From the comparative analysis of the two faulted regions (Phlegethon Catena and Claritas Fossae), we show that local and regional dip variabilities may exist on Mars. This reinforces the idea that the amount of extension associated with Martian rifts must be reconsidered. We also demonstrate the advantages of performing a comparative morphometric analysis of fault scarps. This approach enables the reconstruction of the faults scarps degradation history and can be used to evaluate how environmental conditions changed through time. After modeling the degradation of the fault scarps at the two sites we conclude that the observed morphometric variations are mainly due to the different faulting ages in an environment characterized by low scarp degradation rates (4 × 10 -3 m2/kyr) over the last 3 Ga. © 2014 Elsevier B.V.
Registro:
| Documento: |
Artículo
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| Título: | Morphometric and geometric characterization of normal faults on Mars |
| Autor: | Vaz, D.A.; Spagnuolo, M.G.; Silvestro, S. |
| Filiación: | Centre for Geophysics of the University of Coimbra, Observatório Astronómico da Universidade de Coimbra, Almas de Freire, 3040-004 Coimbra, Portugal CERENA-Centre for Natural Resources and the Environment, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal IDEAN, UBA-CONICET, Ciudad de Bs. As., Argentina Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, Napoli, 80131, Italy Carl Sagan Center, SETI Institute, 189 North Bernardo Avenue, Suite 100, Mountain View, CA 94043, United States
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| Palabras clave: | Dip angle; Mars; Normal faults; Scarp degradation; Degradation; Comparative analysis; Dip angle; Environmental conditions; Geometric characterization; Mars; Morphometric analysis; Morphometric variation; Normal faults; Geometry; degradation; dip; fault geometry; fault scarp; Mars; morphometry; normal fault |
| Año: | 2014
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| Volumen: | 401
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| Página de inicio: | 83
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| Página de fin: | 94
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| DOI: |
http://dx.doi.org/10.1016/j.epsl.2014.05.022 |
| Título revista: | Earth and Planetary Science Letters
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| Título revista abreviado: | Earth Plan. Sci. Lett.
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| ISSN: | 0012821X
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| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0012821X_v401_n_p83_Vaz |
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Citas:
---------- APA ----------
Vaz, D.A., Spagnuolo, M.G. & Silvestro, S.
(2014)
. Morphometric and geometric characterization of normal faults on Mars. Earth and Planetary Science Letters, 401, 83-94.
http://dx.doi.org/10.1016/j.epsl.2014.05.022---------- CHICAGO ----------
Vaz, D.A., Spagnuolo, M.G., Silvestro, S.
"Morphometric and geometric characterization of normal faults on Mars"
. Earth and Planetary Science Letters 401
(2014) : 83-94.
http://dx.doi.org/10.1016/j.epsl.2014.05.022---------- MLA ----------
Vaz, D.A., Spagnuolo, M.G., Silvestro, S.
"Morphometric and geometric characterization of normal faults on Mars"
. Earth and Planetary Science Letters, vol. 401, 2014, pp. 83-94.
http://dx.doi.org/10.1016/j.epsl.2014.05.022---------- VANCOUVER ----------
Vaz, D.A., Spagnuolo, M.G., Silvestro, S. Morphometric and geometric characterization of normal faults on Mars. Earth Plan. Sci. Lett. 2014;401:83-94.
http://dx.doi.org/10.1016/j.epsl.2014.05.022