A deep seismic crustal transect from the NE Iberian Peninsula to the western Mediterranean

Vidal, N.; Muset, Josep Gallart; Dañobeitia, Juan José

doi:10.1029/98jb00076

Cited by 40 publications

(48 citation statements)

References 37 publications

(1 reference statement)

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“…If this has taken place it reinforces our interpretation that the transparent unit as a soft mud. That the faults are not deep-seated appears to be supported by a multichannel seismic reflection profile recorded in the region (Vidal et al, 1998).…”

Section: Seismic Stratigraphymentioning

confidence: 91%

“…As interpreted by Vidal et al (1998), the profile only images three faults, one on the northwest side of the Mallorca Channel and two within the channel itself. The one on the northwest side extends deep into the section, another displaces Horizon M and the third occurs beneath M. Yet the same profile was interpreted by Sabat et al (1995) as showing extensive faulting beyond the shelf's edge from Horizon M to the Mesozoic cover above basement.…”

Section: Seismic Stratigraphymentioning

confidence: 99%

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Sea floor morphology and Plio-Quaternary sedimentary cover of the Mallorca Channel, Balearic Islands, western Mediterranean

et al. 2004

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A complete multibeam coverage of the sea floor of Mallorca Channel, in the western Mediterranean, was recorded during the Spanish Exclusive Economic Zone surveys in 1995, 1996 and 1997. These data, combined with previous high-resolution seismic reflection profiles, allow an assessment of the geomorphology of the area. The channel seafloor is disrupted by a fault complex and pockmarks. Motion along the faults split the sea floor into a series of undulations separated by narrow V-shaped notches. Faulting may be a consequence of recent seaward gravitational sliding that occurred along a soft surface at the top of a late Messinian -early Pliocene unit and a late Messinian evaporite. These units have been tilted during recent subsidence of the Mallorca Channel at the same time that the insular shelf was uplifted along a fault at the shelf's edge. The set of pockmarks in the channel sequence were probably formed by the expulsion of gas of hydrothermal origin, and expulsion may have been enhanced by the faulting. This gas seepage could be an additional factor leading to sediment instability. D

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Section: Seismic Stratigraphymentioning

confidence: 91%

Section: Seismic Stratigraphymentioning

confidence: 99%

Sea floor morphology and Plio-Quaternary sedimentary cover of the Mallorca Channel, Balearic Islands, western Mediterranean

et al. 2004

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“…Combining all the 1D estimates we obtained a final 3D velocity model for the whole area. (Vidal et al, 1998). Grey lines on the map are the main faults of the region.…”

Section: Development Of a 3d Velocity Modelmentioning

confidence: 99%

“…In this study we used a 1D velocity model to perform a preliminary location. It is based on the 2D velocity model of Vidal et al (1998) who interpreted a deep seismic reflection profile in the Valencia through area. Phase readings were obtained from the National earthquake catalogue of the IGN for the time period September 10 to November 4, 2013.…”

Section: Locations Using a 1d Velocity Modelmentioning

confidence: 99%

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Development of a 3D velocity Model for Improving the Location of Potentially Induced Earthquakes in the Gulf of Valencia

Gaite¹,

Ugalde²,

Villaseñor³

2014

Proceedings

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SUMMARYOn September 2013, unusual seismic activity was detected around an underwater gas storage plant in the gulf of Valencia (Spain). According to the reports by the Spanish National Geographic Institute, more than 550 occurred during two months, the strongest having a magnitude of Mw=4.2, which took place after the gas injection activities halted. The low magnitude of the events (only 17 earthquakes had magnitudes greater than 3), their long event-to-station distance, and the inhomogeneous station distribution, made the location problem to be a great challenge. Here we present a preliminary relocation of this earthquake sequence using absolute and relative methods. We also present a new 3D shear-wave velocity model estimated from inversion of Ambient Noise Tomography data which will serve to obtain more accurate seismic-wave travel times to improve the earthquakes location in this area. The interpretation of the results in terms of the tectonic structure of the region is in progress.

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Extreme Mesozoic Crustal Thinning in the Eastern Iberia Margin: The Example of the Columbrets Basin (Valencia Trough)

et al. 2018

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Eastern Iberia preserves a complex succession of Mesozoic rifts partly or completely inverted during the Late Cretaceous and Cenozoic in relation with Africa‐Eurasia convergence. Notably, the Valencia Trough, classically viewed as part of the Cenozoic West Mediterranean basins, preserves in its southwestern part a thick Mesozoic succession (locally ≈10 km thick) over a highly thinned continental basement (locally only ≈3.5 km thick). This subbasin, referred to as the Columbrets Basin, represents a Late Jurassic‐Early Cretaceous hyperextended rift basin weakly overprinted by subsequent events. Its initial configuration is well preserved allowing us to unravel its 3‐D architecture and tectonostratigraphic evolution in the frame of the Mesozoic evolution of eastern Iberia. The Columbrets Basin benefits from an extensive data set combining high‐resolution seismic reflection profiles, drill holes, seismic refraction data, and expanding spread profiles. The interactions between halokinesis, involving the Upper Triassic salt, and extensional deformation controlled the architecture of the Mesozoic basin. The thick uppermost Triassic to Cretaceous succession displays a large‐scale “syncline” shape, progressively stretched and dismembered toward the basin borders. We propose that the SE border of the basin is characterized by a large extensional detachment fault acting at crustal scale and interacting locally with the Upper Triassic décollement. This extensional structure accommodates the exhumation of the continental basement and part of the crustal thinning. Eventually, our results highlight the complex interaction between extreme crustal thinning and occurrence of a prerift salt level for the deformation style and tectonostratigraphic evolution of hyperextended rift basins.

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A deep seismic crustal transect from the NE Iberian Peninsula to the western Mediterranean

Cited by 40 publications

References 37 publications

Sea floor morphology and Plio-Quaternary sedimentary cover of the Mallorca Channel, Balearic Islands, western Mediterranean

Sea floor morphology and Plio-Quaternary sedimentary cover of the Mallorca Channel, Balearic Islands, western Mediterranean

Development of a 3D velocity Model for Improving the Location of Potentially Induced Earthquakes in the Gulf of Valencia

Extreme Mesozoic Crustal Thinning in the Eastern Iberia Margin: The Example of the Columbrets Basin (Valencia Trough)

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