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Auteur Laurent Bollinger |
Documents disponibles écrits par cet auteur (3)
Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externesSusceptibility of microseismic triggering to small sinusoidal stress perturbations at the laboratory scale / Martin Colledge in Journal of geophysical research : Solid Earth, vol 128 n° 4 (April 2023)
Titre : Susceptibility of microseismic triggering to small sinusoidal stress perturbations at the laboratory scale Type de document : Article/Communication Auteurs : Martin Colledge, Auteur ; Jérôme Aubry, Auteur ; Kristel Chanard Année de publication : 2023 Article en page(s) : n° e2022JB025583 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] onde sismique
[Termes IGN] oscillation
[Termes IGN] risque naturel
[Termes IGN] séisme
[Termes IGN] sismicitéRésumé : (auteur) Small transient stress perturbations are prone to trigger (micro)seismicity. In the Earth's crust, these stress perturbations can be caused by various sources such as the passage of seismic waves, forcing by tides, or hydrological seasonal loads. A better understanding of the dynamic of earthquake triggering by stress perturbations is essential to improve our understanding of earthquake physics and our consideration of seismic hazard. Here, we study an experimental sandstone-gouge-filled fault system undergoing combined far field loading and periodic stress perturbations (of variable amplitude and frequency) at crustal pressure conditions. Microseismicity—in the form of acoustic emissions (AEs)—strains, and stresses, are continuously recorded in order to study the response of microseismicity as a function of loading rate, amplitude, and frequency of a periodic stress perturbation. The observed AE distributions do not follow the predictions of either a Coulomb failure model, taking into account both constant loading and oscillation-induced strain rates, or a rate and state model. A susceptibility of the system's AE response to the amplitude of the confinement pressure perturbation is estimated, which highlights a linear relation between confinement pressure amplitude and the AE response amplitude, observations which agree with recent higher frequency experimental results on dynamic triggering. The magnitude-frequency distribution of AEs is also computed. The Gutenberg-Richter b-value oscillates with stress oscillations. Our experiments may help complement our understanding of the influence of low inertia stress phenomena on the distribution of seismicity, such as observations of dynamic triggering and seismicity modulation by tides or hydrological loading. Numéro de notice : A2023-095 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2022JB025583 Date de publication en ligne : 13/04/2023 En ligne : https://doi.org/10.1029/2022JB025583 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103211
in Journal of geophysical research : Solid Earth > vol 128 n° 4 (April 2023) . - n° e2022JB025583[article]
Titre : Orogenic collapse and stress adjustments revealed by an intense seismic swarm following the 2015 Gorkha earthquake in Nepal Type de document : Article/Communication Auteurs : Lok Bijaya Adhikari, Auteur ; Laurent Bollinger, Auteur ; Jérôme Vergne, Auteur ; Sophie Lambotte, Auteur ; Kristel Chanard Année de publication : 2021 Projets : 1-Pas de projet / Article en page(s) : n° 659937 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géophysique interne
[Termes IGN] effondrement de terrain
[Termes IGN] Himalaya
[Termes IGN] Népal
[Termes IGN] séisme
[Termes IGN] variation saisonnièreRésumé : (auteur) The April 25, 2015 Mw 7.9 Gorkha earthquake in Nepal was characterized by a peak slip of several meters and persisting aftershocks. We report here that, in addition, a dense seismic swarm initiated abruptly in August 2017 at the western edge of the afterslip region, below the high Himalchuli-Manaslu range culminating at 8156 m, a region seismically inactive during the past 35 years. Over 6500 events were recorded by the Nepal National Seismological Network with local magnitude ranging between 1.8 and 3.7 until November 2017. This swarm was reactivated between April and July 2018, with about 10 times less events than in 2017, and in 2019 with only sporadic events. The relocation of swarm earthquakes using proximal temporary stations ascertains a shallow depth of hypocenters between the surface and 20 km depth in the High Himalayan Crystalline slab. This swarm reveals an intriguing localized interplay between orogenic collapse and stress adjustments, involving possibly CO2-rich fluid migration, more likely post-seismic slip and seasonal enhancements. Numéro de notice : A2021-788 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3389/feart.2021.659937 Date de publication en ligne : 22/07/2021 En ligne : https://doi.org/10.3389/feart.2021.659937 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98985
in Frontiers in Earth Science > vol 9 (2021) . - n° 659937[article]
Titre : Plate Motion of India and Interseismic Strain in the Nepal Himalaya from GPS and DORIS Measurements Type de document : Article/Communication Auteurs : Pierre Bettinelli, Auteur ; Jean-Philippe Avouac, Auteur ; Mireille Flouzat, Auteur ; F. Jouanne, Auteur ; Laurent Bollinger, Auteur ; Pascal Willis Année de publication : 2006 Article en page(s) : pp 567 - 589 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données DORIS
[Termes IGN] données GPS
[Termes IGN] Himalaya
[Termes IGN] tectonique des plaquesRésumé : (auteur) We analyse geodetically estimated deformation across the Nepal Himalaya in order to determine the geodetic rate of shortening between Southern Tibet and India, previously proposed to range from 12 to 21 mm yr−1. The dataset includes spirit-levelling data along a road going from the Indian to the Tibetan border across Central Nepal, data from the DORIS station on Everest, which has been analysed since 1993, GPS campaign measurements from surveys carried on between 1995 and 2001, as well as data from continuous GPS stations along a transect at the logitude of Kathmandu operated continuously since 1997. The GPS data were processed in International Terrestrial Reference Frame 2000 (ITRF2000), together with the data from 20 International GNSS Service (IGS) stations and then combined using quasi- observation combination analysis (QOCA). Finally, spatially complementary velocities at stations in Southern Tibet, initially determined in ITRF97, were expressed in ITRF2000. After analysing previous studies by different authors, we determined the pole of rotation of the Indian tectonic plate to be located in ITRF2000 at 51.409±1.560° N and −10.915±5.556°E, with an angular velocity of 0.483±0.015°. Myr−1. Internal deformation of India is found to be small, corresponding to less than about 2 mm yr−1 of baseline change between Southern India and the Himalayan piedmont. Based on an elastic dislocation model of interseismic strain and taking into account the uncertainty on India plate motion, the mean convergence rate across Central and Eastern Nepal is estimated to 19±2.5 mm yr−1, (at the 67% confidence level). The main himalayan thrust (MHT) fault was found to be locked from the surface to a depth of about 20 km over a width of about 115 km. In these regions, the model parameters are well constrained, thanks to the long and continuous time-series from the permanent GPS as well as DORIS data. Further west, a convergence rate of 13.4±5 mm yr−1, as well as a fault zone, locked over 150 km, are proposed. The slight discrepancy between the geologically estimated deformation rate of 21±1.5 mm yr−1 and the 19±2.5 mm yr−1 geodetic rate in Central and Eastern Nepal, as well as the lower geodetic rate in Western Nepal compared to Eastern Nepal, places bounds on possible temporal variations of the pattern and rate of strain in the period between large earthquakes in this region. Numéro de notice : A2006-673 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0030-3 Date de publication en ligne : 08/03/2006 En ligne : https://doi.org/10.1007/s00190-006-0030-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102742
in Journal of geodesy > vol 80 n° 8-11 (November 2006) . - pp 567 - 589[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 266-06102 RAB Revue Centre de documentation En réserve L003 Disponible 266-06101 RAB Revue Centre de documentation En réserve L003 Disponible
