The deep structure of the Ecuador subduction zone and adjacent Carnegie Ridge (CR) was investigated using onshore offshore wide-angle seimics. A crustal model obtained by 2-D inversion of traveltimes reveals the overthickened (14 km) oceanic crust of the CR that underthrusts the high velocity (>6 km/s) basement of the upper plate margin wedge,...
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2004 (v1)Journal articleUploaded on: December 4, 2022
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2003 (v1)Journal article
Journal of Geophysical Research, v. 108, n. B10, p. 2484, 2003. http://dx.doi.org/10.1029/2002JB001823
Uploaded on: December 4, 2022 -
2004 (v1)Journal article
Tectonophysics, v. 391, n. 1-4, p. 97-108, 2004. http://dx.doi.org/10.1016/j.tecto.2004.07.010
Uploaded on: December 4, 2022 -
December 10, 2018 (v1)Conference paper
International audience
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August 26, 2013 (v1)Journal article
[1] The origin of the Algerian margin remains one of the key questions still discussed in the Western Mediterranean sea, due to the imprecise nature and kinematics of the associated basin during the Neogene. For the first time, the deep structure of the Maghrebian margin was explored during the SPIRAL seismic survey. In this work, we present a...
Uploaded on: October 11, 2023 -
February 12, 2013 (v1)Journal article
The Lesser Antilles subduction zone has produced no recent strong thrust earthquakes, making it difficult to quantify the seismic hazard from such events. The Lesser Antilles arc has a low subduction rate and an accretionary wedge that is very wide at its southern end. To investigate the effect of the wedge on seismogenesis, numerical models of...
Uploaded on: December 2, 2022 -
August 26, 2013 (v1)Journal article
[1] The origin of the Algerian margin remains one of the key questions still discussed in the Western Mediterranean sea, due to the imprecise nature and kinematics of the associated basin during the Neogene. For the first time, the deep structure of the Maghrebian margin was explored during the SPIRAL seismic survey. In this work, we present a...
Uploaded on: December 2, 2022 -
April 7, 2019 (v1)Publication
International audience
Uploaded on: December 4, 2022 -
December 9, 2019 (v1)Conference paper
Along the convex Northern Lesser Antilles margin, plate convergence obliquity increases northward resulting in subduction normal to the trench to the west of Guadeloupe and highly oblique (>75°) to the North of Virgin Island. In this context, tectonic structures related to strain partitioning has long been debated, but are still poorly imaged....
Uploaded on: December 4, 2022 -
November 1, 2021 (v1)Conference paper
International audience
Uploaded on: December 3, 2022 -
December 9, 2019 (v1)Conference paper
Since Cretaceous, the Lesser Antilles subduction zone has undergone a multiphase tectonic history resulting in its present-day complex architecture. One peculiar aspect for this subduction is the trench / arc convexity from Martinique, in the South, where the subduction is frontal, to Anguilla, to the North, where the convergence obliquity is...
Uploaded on: December 3, 2022 -
2004 (v1)Journal article
Journal of Geophysical Research, v. 109, p. B11103, 2004. http://dx.doi.org/10.1029/2004JB003060
Uploaded on: December 4, 2022 -
December 9, 2019 (v1)Publication
Forearc sedimentary basins record changes in tectonic regime and are thus key area to investigate the tectonic history of a subduction zone through time.Since Cretaceous, The Lesser Antilles subduction zone has undergone a multiphase tectonic history resulting in its present-day complex architecture. One peculiar aspect for this subduction is...
Uploaded on: December 4, 2022 -
June 23, 2009 (v1)Journal article
We describe for the first time a set of large active thrusts and folds near the foot of the easternmost Algerian margin, Western Mediterranean, from swath bathymetry and high-resolution seismic data acquired in 2005 during the Maradja2/Samra cruise. This active system resumes a previous passive margin and creates growth strata deposition on the...
Uploaded on: December 4, 2022 -
May 2017 (v1)Journal article
Whether subducted oceanic reliefs such as seamounts promote seismic rupture or aseismic slip remains controversial. Here we use swath bathymetry, prestack depth-migrated multichannel seismic reflection lines, and wide-angle seismic data collected across the central Ecuador subduction segment to reveal a broad ~55 km × 50 km, ~1.5–2.0 km high,...
Uploaded on: December 4, 2022 -
October 21, 2019 (v1)Publication
International audience
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2009 (v1)Journal article
Forearc tectonics at accretionary convergent margins has variously been studied using analogue and numerical modelling techniques. Numerous geophysical investigations have targeted the subsurface structure of active forearc settings at convergent margins. However, several critical details of the structure, mode of tectonic evolution and the...
Uploaded on: December 4, 2022 -
May 15, 2005 (v1)Journal article
Offshore Ecuador, the Carnegie Ridge is a volcanic ridge with a carbonate sediment drape. During the SALIERI Cruise, multibeam bathymetry was collected across Carnegie Ridge with the Simrad EM120 of the R/V SONNE. The most conspicuous features discovered on the Carnegie Ridge are fields of circular closed depressions widely distributed along...
Uploaded on: March 25, 2023 -
January 27, 2010 (v1)Journal article
The 26 December 2004 Sumatra earthquake (Mw = 9.1) initiated around 30 km depth and ruptured 1300 km of the Indo‐Australian–Sunda plate boundary. During the Sumatra‐OBS (ocean bottom seismometer) survey, a wide‐angle seismic profile was acquired across the epicentral region. A seismic velocity model was obtained from combined travel time...
Uploaded on: December 3, 2022 -
December 9, 2019 (v1)Conference paper
International audience
Uploaded on: December 4, 2022 -
December 10, 2018 (v1)Conference paper
International audience
Uploaded on: December 4, 2022 -
2021 (v1)Journal article
Oceanic crust formed at slow-spreading ridges is currently subducted in only a few places on Earth and the tectonic and seismogenic imprint of the slow-spreading process is poorly understood. Here we present seismic and bathymetric data from the Northeastern Lesser Antilles Subduction Zone where thick sediments enable seismic imaging to greater...
Uploaded on: December 4, 2022 -
December 10, 2018 (v1)Publication
International audience
Uploaded on: December 4, 2022 -
July 15, 2009 (v1)Journal article
Current models predict that the seismogenic zone along subduction thrusts, where the largest earthquakes nucleate and propagate, does not extend to the forearc mantle below the crust of the upper plate. Stable sliding conditions have been shown to prevail there, particularly along several circum-Pacific margins that underwent great megathrust...
Uploaded on: December 3, 2022 -
December 10, 2018 (v1)Publication
International audience
Uploaded on: February 22, 2023