A. Anglade

Centre National de la Recherche Scientifique

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Yann Hello

Géoazur

Philippe Charvis

Géoazur

B. Yates

The University of Texas at Austin

N. Béthoux

Centre National de la Recherche Scientifique

B. Philibosian

United States Geological Survey

Jennifer Weil-Accardo

Centre National de la Recherche Scientifique

Nathalie Feuillet

Institut de physique du globe de Paris

Alcinoe Calahorrano

Institut de Ciències del Mar

Valentı́ Sallarès

Institut de Ciències del Mar

Audrey Gailler

CEA DAM Île-de-France

Cooperative Institutions

Centre National de la Recherche Scientifique

Institut de Recherche pour le Développement

Institut de physique du globe de Paris

Géoazur

Sorbonne Université

Université Paris Cité

Université Côte d'Azur

Observatoire de la Côte d’Azur

Sorbonne Paris Cité

Institut des Sciences de la Terre de Paris

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Significant technical advances in broadband seismic stations in the Lesser Antilles

Advances in geosciences (2015)

A. Anglade Arnaud Lemarchand Jean‐Marie Saurel Valérie Clouard Marie‐Paule Bouin

Abstract. In the last few years, French West Indies observatories from the Institut de Physique du Globe de Paris (IPGP), in collaboration with The UWI Seismic Research Centre (SRC, University of West Indies), have modernized the Lesser Antilles Arc seismic and deformation monitoring network. 15 new, permanent stations have been installed that strengthen and expand its detection capabilities. The global network of the IPGP-SRC consortium is now composed of 20 modernized stations, all equipped with broadband seismometers, strong motion sensors, Global Positioning System (GPS) sensors and satellite communication for real-time data transfer. To enhance the sensitivity and reduce ambient noise, special efforts were made to improve the design of the seismic vault and the original Stuttgart shielding of the broadband seismometers (240 and 120s corner period). Tests were conducted for several months, involving different types of countermeasures, to achieve the highest performance level of the seismometers. GPS data, realtime and validated seismic data (only broadband) are now available from the IPGP data centre (http://centrededonnees.ipgp.fr/index.php?&lang=EN). This upgraded network feeds the Caribbean Tsunami Warning System supported by UNESCO and establishes a monitoring tool that produces high quality data for studying subduction and volcanic processes in the Lesser Antilles arc.

Seismometer

10.5194/adgeo-40-43-2015

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Geoazur's contribution in instrumentation to monitor seismic activity of the Earth

AGU Fall Meeting Abstracts (2011)

B. Yates Yann Hello A. Anglade O. Desprez A. Ogé

Instrumentation

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The onshore-offshore ENCENS project: Imaging the stretching of the continental lithosphere and inception of oceanic spreading in the eastern Gulf of Aden

AGU Fall Meeting Abstracts (2006)

S. Leroy C. Ebinger E. D'Acremont G. W. Stuart A. Al-Lazki

Continental Margin

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Citations (8)

The Grosmarin experiment

Stefano Solarino Jean‐Xavier Dessa N. Béthoux Marie‐Odile Beslier Yann Hello

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3D tomographic structure of the north andean subduction zone at the Colombia-Ecuador border

AGU Fall Meeting Abstracts (2007)

Lina Constanza García Cano A. Galvé Gema de la Torre Philippe Charvis B. Pontoise

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Interaction Between Climate and Tectonics in the Northern Lesser Antilles Inferred From the Last Interglacial Shoreline on Barbuda Island

Geochemistry Geophysics Geosystems (2022)

Jennifer Weil-Accardo Nathalie Feuillet B. Philibosian Abel Guihou E. Jacques

Abstract In the context of increasing evidence of plate interface coupling variability in subduction zones, there is a need to extend the short time window given by instrumental data and to gather data over multiple time and spatial scales. We hence investigated the long‐term topography on Barbuda island, located in the northern part of the Lesser Antilles, west of the Caribbean subduction zone. Following pioneering work using a set of marine terraces on the eastern side of the island, we performed the first U‐Th dating on 10 corals in growth position from the lowest terrace, for which the highest relative sea‐level (RSL) indicator is found at 9 ± 1 m above the mean sea level. We find that this terrace corresponds to the Last Interglacial (LIG) (ages between 122.8 ± 0.3 ka and 128.1 ± 0.3 ka) and we estimate a paleo RSL of 7 ± 2 m above the current mean sea level. The present elevation of the LIG shoreline on Barbuda might imply tectonics as an additional mechanism to eustatic sea level, mantle dynamic topography and glacial isostatic adjustment. East‐west morphological asymmetry of Barbuda and difference in LIG shoreline elevation between Barbuda and Antigua suggest a regional tectonic process. As with the proposed westward tilting from the forearc to the volcanic arc of the Guadeloupe archipelago, vertical deformation on Barbuda could be related to plate‐scale subduction processes. Long‐term uplift of Barbuda might be related to the accumulation of residual coseismic deformation not fully recovered by interseismic subsidence and the corresponding seismogenic segment would extend below the Moho.

Forearc

Tectonic uplift

10.1029/2021gc010045

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Wide-angle Seismic and Bathymetric Survey of The Carnegie Ridge and Ecuador Margin: The French-german Salieri Cruise (r/v Sonne, 22-08/16-09 2001)

EGS General Assembly Conference Abstracts (2002)

Philippe Charvis Ernst R. Flüh François Michaud Julien Collot Audrey Gailler

Sonne

Margin (machine learning)

Bathymetric chart

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Towards full waveform simulation using SPECFEM3D for earthquakes in the Lesser Antilles subduction zone

AGU Fall Meeting Abstracts (2016)

Lidong Bie T. Garth Andreas Rietbrock J. Collier Saskia Goes

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The ESMERALDAS experiment offshore-onshore North Ecuador-South Colombia: investigations on margin segmentation and earthquake generation

B. Pontoise Philippe Charvis Nicole Béthoux Yann Hello Yvonne Font

Margin (machine learning)

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20th-century strain accumulation on the Lesser Antilles megathrust based on coral microatolls

Earth and Planetary Science Letters (2022)

B. Philibosian Nathalie Feuillet Jennifer Weil-Accardo E. Jacques Abel Guihou

The seismic potential of the Lesser Antilles megathrust remains poorly known, despite the potential hazard it poses to numerous island populations and its proximity to the Americas. As it has not produced any large earthquakes in the instrumental era, the megathrust is often assumed to be aseismic. However, historical records of great earthquakes in the 19th century and earlier, which were most likely megathrust ruptures, demonstrate that the subduction is not entirely aseismic. Recent occurrences of giant earthquakes in areas where such events were previously thought to be improbable have illustrated the importance of critically evaluating the seismic potential of other "low-hazard" subduction zones, such as the Lesser Antilles. Using the method of coral microatoll paleogeodesy developed in Sumatra, we examine 20th-century vertical deformation on the forearc islands of the Lesser Antilles and model the underlying strain accumulation on the megathrust. Our data indicate that the eastern coasts of the forearc islands have been subsiding by up to ∼8 mm/yr relative to sites closer to the arc, suggesting that on the time scale of the 20th century, a portion of the megathrust just east of the forearc islands has been locked. Our findings are in contrast to recent models based on satellite geodesy that suggest little or no strain accumulation anywhere along the Lesser Antilles megathrust. This discrepancy is potentially explained by the different time scales of measurement, as recent studies elsewhere have indicated that interseismic coupling patterns may vary on decadal time scales and that century-scale or longer records are required to fully assess seismic potential. The accumulated strain we have detected will likely be released in future megathrust earthquakes, uplifting previously subsiding areas and potentially causing widespread damage from strong ground motion and tsunami waves.

Forearc

10.1016/j.epsl.2021.117343

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Citations (19)