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4. Erratum: The GEOSCOPE Program: Progress and Challenges during the Past 30 Years

Author

Roult, Geneviève, Montagner, Jean-Paul, Romanowicz, Barbara, Cara, Michel, Rouland, Daniel, Pillet, Robert, Karczewski, J.-F., Rivera, Luis, Stutzmann, Eléonore, Maggi, Alessia, Institut de Physique du Globe de Paris (IPGP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Seismological Laboratory [Berkeley], Chaire Physique de l'intérieur de la Terre, Collège de France (CdF (institution)), Sismologie (IPGS) (IPGS-Sismologie), Institut de physique du globe de Strasbourg (IPGS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Géoazur (GEOAZUR 6526), Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Collège de France - Chaire Physique de l'intérieur de la Terre, Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], [SDE.MCG]Environmental Sciences/Global Changes, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2013

10. Détection automatique des séismes de la station sismologique de Dzumac

Author

Lebellegard, Pierre, Baldassari, Catherine, Pillet, Robert, and Régnier, Marc

Subjects
STATION DE MESURE, TRAITEMENT DE DONNEES, ACQUISITION DE DONNEES, TRANSMISSION DE DONNEES, SEISME, SURVEILLANCE, RESEAU INFORMATIQUE, AUTOMATISATION, LOGICIEL D'APPLICATION
Published
2002

12. Interseismic and coseismic motions in GPS series related to the Ms 7.3. July 13, 1994, Malekula earthquake, central New Hebrides subduction zone

Author

Calmant, Stéphane, Pelletier, Bernard, Pillet, Robert, Régnier, Marc, Lebellegard, Pierre, Maillard, D., Taylor, F., Bevis, M., and Recy, Jacques

Subjects
EPICENTRE, COMPRESSION TECTONIQUE, SUBDUCTION, SEISME, GPS, MARGE CONTINENTALE, CONTRAINTE
Abstract

On July 13, 1994, an earthquake Ms = 7.3 occurred at Malekula, in the New Hebrides archipelago. The GPS data collected across the New Hebrides trench between 1990 and 1996 were processed in order to separate the interseismic and coseismic motions from the drifts related to the convergence with the Australian plate. The GPS-derived coseismic displacements at the GPS site in Malekula are 49 = 15 mm southward, 230 = 30 mm westward and 170 = 37 mm downward, when the CMT-derived displacements are 50 mm southward, 210 mm westward and 150 mm downward. Taking into account the interseismic strain accumulation (25 mm/yr at the source established from historical seismicity, 7.5 mm/yr at the GPS site), the strain-free convergence rate at Malekula is 49 = 3 mm/yr. Other GPS-derived convergence rates are 95 = 1 mm/yr at Efate and 37 = 2 mm/yr at Santo. These rates imply a regional right-lateral motion between the Efate and the Santo-Malekula segments. In contrast, the focal mechanism of the earthquake mostly indicates a lift-lateral motion. Therefore, we hypothesize that the earthquake is related to variations in the interplate coupling along the converging boundary of the Santo-Malekula segment. (Résumé d'auteur)

Published
1997

19. Interpretation of Broadband Ocean-Bottom Seismometer Horizontal Data Seismic Background Noise.

Author

Pillet, Robert, Deschamps, Anne, Legrand, Denis, Virieux, Jean, Béthoux, Nicole, and Yates, Ben

Subjects
SEISMOMETERS, ROTATIONAL motion, MICROSEISMS, DEFORMATIONS (Mechanics), EARTHQUAKE prediction
Abstract

The seismic background noise observed on the OBS (ocean-bottom seismometer) recordings is well known to be strong. With the recent appearance of broadband OBS, the background noise in the extended frequency range is even more significant. By taking into account the various degrees of freedom of the seismic sensors, it has been shown that the seismometers are not only translational sensors but also rotational ones with a sensitivity that depends on the installation. The strong similarity of the background noise recorded on the two horizontal traces of the broadband Hippocampe OBS data deployed during the Rosmarin program is interpreted as a rotational motion around the vertical axis. This torsion motion is so important that it dominates the other noise seismic contributions like translations and tilt (rotational motion around a horizontal axis) and represents more than 90% of the background noise signal at the periods between 5 and 50 sec. Use of the difference between the two horizontal traces makes it possible to reduce the background noise made up primarily of this torsion motion and thus to enhance the displacement signal but also strongly modify it. An effort should be made to better control the installation of the sensors on the seafloor. A better solution would be to simultaneously record rotations at the same position as that of the seismometer. Such data will permit the correction of the seismic traces of the OBS data and strongly reduce the background noise. [ABSTRACT FROM AUTHOR]

Published
2009
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20. The GEOSCOPE program: Present status and perspectives

Author

Romanowicz, Barbara, primary, Karczewski, Jean François, additional, Cara, Michel, additional, Bernard, Pascal, additional, Borsenberger, Jean, additional, Cantin, Jean-Michel, additional, Dole, Bernard, additional, Fouassier, Danielle, additional, Koenig, Jean-Claude, additional, Morand, Michel, additional, Pillet, Robert, additional, Pyrolley, Annick, additional, and Rouland, Daniel, additional

Published
1991
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