The North Maladeta Fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: Recent activity revealed by geomorphological and geophysical research

Ortuño, María; Queralt, Pilar; Martí, Anna; Ledo, Juanjo; Masana, Eulàlia; Perea, Héctor; Santanach, P.

doi:10.1016/j.tecto.2007.06.016

Cited by 50 publications

(40 citation statements)

References 49 publications

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“…A greater tilt is observed in the Prüedo section (6 -7º) than in the Porèra section (3 -4º). In both cases, the tilting is greater than the observed in the larger distance profiles obtained by Ortuño et al (2008) through the geomorphological analysis. This fact is in agreement with the development of a half graben geometry by the secondary faulting of the part of the hanging wall located next to the fault plane.…”

Section: Geometry Of the Prüedo Neogene Basinmentioning

confidence: 56%

“…3), parallel to the section previously studied by Ortuño et al (2008) at the Prüedo peneplain (profile Prüedo, Fig. 3; Fig.…”

Section: Geophysical Surveymentioning

confidence: 81%

“…More recently, Ortuño (2008) and Ortuño et al (2008) have provided new data supporting that the Prüedo sediments are the infill of a tectonic basin (the Prüedo basin) developed by the activity of the NMF. The activity of this normal fault after the main Alpine orogenic phase has been constrained by the combination of geomorphological, geological and geophysical methods, which have allowed the determination of the extension and depth of the Prüedo sedimentary basin in a S-N section across the Prüedo peneplain (Fig.…”

Section: Origin Of the Basinmentioning

confidence: 99%

“…1). The Gavarnie thrust, one of the main Alpine structures on the Axial zone of the Pyrenees, was inverted in the post-orogenic period as a normal fault, and has been referred in the literature (Kleinsmiede, 1960;Bordonau and Vilaplana, 1986;Ortuño et al, 2008;Ortuño, 2008) as the North Maladeta fault (NMF). The relationship between the recent activity of this fault and the Prüedo sediments will be retaken up later on this work.…”

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

“…2 and 3). They are part of a group of high plains that have been interpreted as the remnants of a regional peneplain formed prior to the Quaternary glacial-river incision (Kleinsmiede, 1960;Zandvliet 1960;Ortuño, 2008;Ortuño et al 2008). The S-N trending rivers incised in these plains are tributary headwaters rivers of the Garona river, which flows today into the Atlantic ocean.…”

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

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Palaeoenvironments of the Late Miocene Prüedo Basin: implications for the uplift of the Central Pyrenees

Ortuño

Martí

Martı́n-Closas

et al. 2013

JGS

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The definitive version is available at: La versione definitiva è disponibile alla Ortuño et al. AbstractThe remnants of a palaeo-basin sedimentary infill outcropping at the Aran valley (Central Axial Pyrenees) have been mapped and studied combining stratigraphical and biostratigraphycal analysis with an audiomagnetotelluric surveying. The basin was developed on top of a preexisting peneplain and was formed by its offset as a half-graben related to the North Maladeta fault activity. The basin had an elongated E-W lensoidal shape and was infilled by an, at least, ~100 m thick sequence of fluvio-palustrine deposits derived from a palaeo-Garona river. The detritic sequence is composed by three major facies assemblages: a basal member dominated by conglomerates; a medium member mainly composed of sandstones and siltstones; and an upper member characterized by a rhythmic sequence of sandstones-siltstones and lignite layers. The results derived from the palynological and carpological analyses have allowed to constrain the age of the basin infill as Late Miocene, and very likely Vallesian; to characterize the vegetation of the belt surrounding the basin as a mainly temperate to warm-temperate assemblage and to estimate the palaeoaltitude of the site between 900 and 1000 m.a.s.l. Specimens of the taxon Hippuris cf. parvicarpa Nikitin have been identified for the first time in a European palaeoflora. The palaeontological dating of the basin infill allows estimating a minimum Upper Miocene age for the peneplains preserved in the area. The significance of the origin, preservation, and uplift of these landforms in the core of the Pyrenean orogen is discussed in the lights of the results of this work.

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Section: Geometry Of the Prüedo Neogene Basinmentioning

confidence: 56%

“…3), parallel to the section previously studied by Ortuño et al (2008) at the Prüedo peneplain (profile Prüedo, Fig. 3; Fig.…”

Section: Geophysical Surveymentioning

confidence: 81%

Section: Origin Of the Basinmentioning

confidence: 99%

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

See 3 more Smart Citations

Palaeoenvironments of the Late Miocene Prüedo Basin: implications for the uplift of the Central Pyrenees

Ortuño

Martí

Martı́n-Closas

et al. 2013

JGS

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Normal Faulting in the 1923 Berdún Earthquake and Postorogenic Extension in the Pyrenees

Stich

Martín

Batlló

et al. 2018

Geophysical Research Letters

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The 10 July 1923 earthquake near Berdún (Spain) is the largest instrumentally recorded event in the Pyrenees. We recover old analog seismograms and use 20 hand‐digitized waveforms for regional moment tensor inversion. We estimate moment magnitude Mw 5.4, centroid depth of 8 km, and a pure normal faulting source with strike parallel to the mountain chain (N292°E), dip of 66° and rake of −88°. The new mechanism fits into the general predominance of normal faulting in the Pyrenees and extension inferred from Global Positioning System data. The unique location of the 1923 earthquake, near the south Pyrenean thrust front, shows that the extensional regime is not confined to the axial zone where high topography and the crustal root are located. Together with seismicity near the northern mountain front, this indicates that gravitational potential energy in the western Pyrenees is not extracted locally but induces a wide distribution of postorogenic deformation.

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Active Faults in Iberia

Galdeano¹,

Azañón²,

Ruano³

et al. 2019

Regional Geology Reviews

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The North Maladeta Fault (Spanish Central Pyrenees) as the Vielha 1923 earthquake seismic source: Recent activity revealed by geomorphological and geophysical research

Cited by 50 publications

References 49 publications

Palaeoenvironments of the Late Miocene Prüedo Basin: implications for the uplift of the Central Pyrenees

Palaeoenvironments of the Late Miocene Prüedo Basin: implications for the uplift of the Central Pyrenees

Normal Faulting in the 1923 Berdún Earthquake and Postorogenic Extension in the Pyrenees

Active Faults in Iberia

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