François Beauducel

Institut de physique du globe de Paris

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Aline Peltier

Institut de physique du globe de Paris

Nathalie Feuillet

Institut de physique du globe de Paris

Jean‐Marie Saurel

Institut de physique du globe de Paris

Agus Santoso

ARC Centre of Excellence for Climate System Science

Christine Deplus

Centre National de la Recherche Scientifique

E. Jacques

Institut de physique du globe de Paris

Arnaud Lemarchand

Institut de physique du globe de Paris

Marie‐Paule Bouin

Institut de physique du globe de Paris

Sara Bazin

Université de Bretagne Occidentale

Jean‐Christophe Komorowski

Institut de physique du globe de Paris

Cooperative Institutions

Centre National de la Recherche Scientifique

234

Institut de physique du globe de Paris

172

Université Paris Cité

134

Sorbonne Paris Cité

Institut de Recherche pour le Développement

Institut des Sciences de la Terre

Sorbonne Université

Université Gustave Eiffel

Istituto Nazionale di Geofisica e Vulcanologia

Meteorological, Climatological, And Geophysical Agency

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The MU-RAY project: Summary of the round-table discussions

Earth Planets and Space (2010)

François Beauducel A. Bross S. Buontempo Luca D’Auria Y. Déclais

Summit

Table (database)

Baseline (sea)

10.5047/eps.2009.03.004

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Citations (7)

Constraints on magma flux from displacements data at Merapi volcano, Java, Indonesia

Journal of Geophysical Research Atmospheres (2000)

François Beauducel François Cornet Edi Suhanto T. Duquesnoy Michel Kasser

The displacement field has been monitored in the vicinity of the crater rim at Mount Merapi (Indonesia) from 1993 to 1997. During this period the volcanic activity has been quasicontinuous with dome growth, explosions, and pyroclastic flows. We measured a nine‐point network every year with the Global Positioning System static method. Interpretation of results is conducted with a three‐dimensional elastostatic boundary elements code that takes into account topography, fractures, and complex magma source geometry. The inversion technique yields an estimate of the variation with time of the boundary conditions at the magma duct interface together with the probability associated with the best model. The Young's modulus of the equivalent continuum is found to be very low (of the order of 1 GPa), a feature which suggests that a viscoelastic behavior may be more appropriate for this rock mass, given the observed seismic velocities for the domain of interest. A striking compatibility is outlined between observed deformations and the rate of occurrence of multiphase seismic events, once the main fractures of the structure have been taken into consideration. This suggests that the summit elastic (or viscoelastic) deformation field is controlled by the magma flux within the duct rather than by magma pressure variations. In addition, a nonelastic displacement has been identified at the westernmost point of the network. This was considered critical for the stability of the summit structure, a concern whose validity has been verified a posteriori by the July 1998 explosion.

Magma chamber

10.1029/1999jb900368

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Citations (56)

Birth of a large volcanic edifice offshore Mayotte via lithosphere-scale dike intrusion

HAL (Le Centre pour la Communication Scientifique Directe) (2021)

Nathalie Feuillet Stéphan Jorry Wayne C. Crawford Christine Deplus Isabelle Thinon

Dike

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L’Observatoire Volcanologique et Sismologique de Guadeloupe (IPGP) : Missions, réseaux et bilan de l’activité sismique régionale

Ivan Vlastelić François Beauducel Arnaud Burtin Jordane Corbeau Jean‐Bernard de Chabalier

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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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Citations (9)

Global coseismic deformations, GNSS time series analysis, and earthquake scaling laws

Journal of Geophysical Research Solid Earth (2014)

Laurent Métivier Xavier Collilieux Daphné Lercier Z. Altamimi François Beauducel

Abstract We investigate how two decades of coseismic deformations affect time series of GPS station coordinates (Global Navigation Satellite System) and what constraints geodetic observations give on earthquake scaling laws. We developed a simple but rapid model for coseismic deformations, assuming different earthquake scaling relations, that we systematically applied on earthquakes with magnitude larger than 4. We found that coseismic displacements accumulated during the last two decades can be larger than 10 m locally and that the cumulative displacement is not only due to large earthquakes but also to the accumulation of many small motions induced by smaller earthquakes. Then, investigating a global network of GPS stations, we demonstrate that a systematic global modeling of coseismic deformations helps greatly to detect discontinuities in GPS coordinate time series, which are still today one of the major sources of error in terrestrial reference frame construction (e.g., the International Terrestrial Reference Frame). We show that numerous discontinuities induced by earthquakes are too small to be visually detected because of seasonal variations and GPS noise that disturb their identification. However, not taking these discontinuities into account has a large impact on the station velocity estimation, considering today's precision requirements. Finally, six groups of earthquake scaling laws were tested. Comparisons with our GPS time series analysis on dedicated earthquakes give insights on the consistency of these scaling laws with geodetic observations and Okada coseismic approach.

Classification of discontinuities

Coordinate time

10.1002/2014jb011280

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Citations (32)

Two hundred thirty years of relative sea level changes due to climate and megathrust tectonics recorded in coral microatolls of Martinique (French West Indies)

Journal of Geophysical Research Solid Earth (2016)

Jennifer Weil‐Accardo Nathalie Feuillet E. Jacques Pierre Deschamps François Beauducel

Abstract We sampled six coral microatolls that recorded the relative sea level changes over the last 230 years east of Martinique, on fringing reefs in protected bays. The microatolls are cup‐shaped, which is characteristic of corals that have been experiencing submergence. X‐ray analysis of coral slices and reconstructions of the highest level of survival (HLS) curves show that they have submerged at rates of a few millimeters per year. Their morphology reveals changes in submergence rate around 1829 ± 11, 1895, and 1950. Tide gauges available in the region indicate a regional sea level rise at a constant mean rate of 1.1 ± 0.8 mm/yr, which contrasts with our coral record, implying additional tectonic subsidence. Comparing our coral morphology with that of synthetic corals generated with Matlab by using the Key West tide gauge record (Florida), we show that their growth was controlled by tectonics and that a sudden relative sea level increase drowned them around 1950. Simple elastic models show that this sudden submergence probably occurred during the 21 May 1946 earthquake, which ruptured the plate interface in front of Martinique, in the mantle wedge, in an area of sustained seismic activity. The 1839 M 8+ earthquake probably occurred in the same area. Long‐term subsidence of microatolls indicates that this deep portion of the megathrust is probably locked down to 60 km depth during the interseismic period. Our oldest coral recorded a long‐lasting period (50 years) of stable relative sea level after the 1839 earthquake, indicating that transient interseismic strain rate variations may occur in the Lesser Antilles.

Martinique

Tide gauge

10.1002/2015jb012406

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Citations (28)

Growth and collapse of the 2018–2019 lava dome of Merapi volcano

Bulletin of Volcanology (2021)

Karim Kelfoun Agus Santoso Thierry Latchimy Martial Bontemps Ilham Nurdien

Lava dome

Dome (geology)

Volcanic cone

Stratovolcano