75 research outputs found

    PREDON Scientific Data Preservation 2014

    Get PDF
    LPSC14037Scientific data collected with modern sensors or dedicated detectors exceed very often the perimeter of the initial scientific design. These data are obtained more and more frequently with large material and human efforts. A large class of scientific experiments are in fact unique because of their large scale, with very small chances to be repeated and to superseded by new experiments in the same domain: for instance high energy physics and astrophysics experiments involve multi-annual developments and a simple duplication of efforts in order to reproduce old data is simply not affordable. Other scientific experiments are in fact unique by nature: earth science, medical sciences etc. since the collected data is "time-stamped" and thereby non-reproducible by new experiments or observations. In addition, scientific data collection increased dramatically in the recent years, participating to the so-called "data deluge" and inviting for common reflection in the context of "big data" investigations. The new knowledge obtained using these data should be preserved long term such that the access and the re-use are made possible and lead to an enhancement of the initial investment. Data observatories, based on open access policies and coupled with multi-disciplinary techniques for indexing and mining may lead to truly new paradigms in science. It is therefore of outmost importance to pursue a coherent and vigorous approach to preserve the scientific data at long term. The preservation remains nevertheless a challenge due to the complexity of the data structure, the fragility of the custom-made software environments as well as the lack of rigorous approaches in workflows and algorithms. To address this challenge, the PREDON project has been initiated in France in 2012 within the MASTODONS program: a Big Data scientific challenge, initiated and supported by the Interdisciplinary Mission of the National Centre for Scientific Research (CNRS). PREDON is a study group formed by researchers from different disciplines and institutes. Several meetings and workshops lead to a rich exchange in ideas, paradigms and methods. The present document includes contributions of the participants to the PREDON Study Group, as well as invited papers, related to the scientific case, methodology and technology. This document should be read as a "facts finding" resource pointing to a concrete and significant scientific interest for long term research data preservation, as well as to cutting edge methods and technologies to achieve this goal. A sustained, coherent and long term action in the area of scientific data preservation would be highly beneficial

    Rapid response to the M_w 4.9 earthquake of November 11, 2019 in Le Teil, Lower RhĂŽne Valley, France

    Get PDF
    On November 11, 2019, a Mw 4.9 earthquake hit the region close to Montelimar (lower RhĂŽne Valley, France), on the eastern margin of the Massif Central close to the external part of the Alps. Occuring in a moderate seismicity area, this earthquake is remarkable for its very shallow focal depth (between 1 and 3 km), its magnitude, and the moderate to large damages it produced in several villages. InSAR interferograms indicated a shallow rupture about 4 km long reaching the surface and the reactivation of the ancient NE-SW La Rouviere normal fault in reverse faulting in agreement with the present-day E-W compressional tectonics. The peculiarity of this earthquake together with a poor coverage of the epicentral region by permanent seismological and geodetic stations triggered the mobilisation of the French post-seismic unit and the broad French scientific community from various institutions, with the deployment of geophysical instruments (seismological and geodesic stations), geological field surveys, and field evaluation of the intensity of the earthquake. Within 7 days after the mainshock, 47 seismological stations were deployed in the epicentral area to improve the Le Teil aftershocks locations relative to the French permanent seismological network (RESIF), monitor the temporal and spatial evolution of microearthquakes close to the fault plane and temporal evolution of the seismic response of 3 damaged historical buildings, and to study suspected site effects and their influence in the distribution of seismic damage. This seismological dataset, completed by data owned by different institutions, was integrated in a homogeneous archive and distributed through FDSN web services by the RESIF data center. This dataset, together with observations of surface rupture evidences, geologic, geodetic and satellite data, will help to unravel the causes and rupture mechanism of this earthquake, and contribute to account in seismic hazard assessment for earthquakes along the major regional CĂ©venne fault system in a context of present-day compressional tectonics

    Séisme du Teil. 11 novembre 2019. Le Teil. Endommage d'une entrée de cave

    No full text
    This photo was taken during a Macroseismic Response Group mission that took place from November 18 to 22, 2019, following the November 11, 2019, magnitude 5.2 Mlv earthquake. Damage to an entrance to a cellar can be seen in the commune of Le Teil, rue Jean Vernet. This is the most affected commune, with collapsed buildings. From the point of view of intensity, the earthquake on this town reached an intensity of VII (on a scale from I to XII). The very shallow depth of the focus of the earthquake (about 2 km), as well as the propagation of the rupture to the surface, imply a much greater intensity of shaking in the epicentral area (up to about 15 km from the epicenter) than for more conventional events of the same magnitude (depth around 10 km). The significant damage to the town of Le Teil is an illustration. This earthquake is the largest in mainland France in terms of impact (extent of intensity VI and above, and damage to the most vulnerable buildings) for 52 years (since the earthquake of Arette in 1967). The macro-seismic intervention group intervenes on the sites of earthquakes to evaluate the intensity of the tremor, from the effects of the earthquake on structures, buildings, individual houses. These field observations complement the testimonies provided by citizens on the france-seisme website. They are one of the elements that participate in the establishment of the state of natural disaster by the authorities. The macro-seismic survey also completes the other analyses carried out by scientists within the French seismological and geodesic network RĂ©sif, in particular within the framework of its Transverse Action Seismicity. RĂ©sif is a national research infrastructure dedicated to the observation and understanding of the Earth's internal structure and dynamics. RĂ©sif is based on high technology observation networks, composed of seismological, geodesic and gravimetric instruments deployed in a dense way on the whole French territory. The data collected allow to study with a high spatio-temporal resolution the ground deformation, the superficial and deep structures, the seismicity at the local and global scale and the natural hazards, and more particularly the seismic ones, on the French territory. RĂ©sif is part of the European (EPOS - European Plate Observing System) and global systems of instruments allowing to image the interior of the Earth in its entirety and to study many natural phenomena.Cette photo a Ă©tĂ© prise lors d'une mission du Groupe d'intervention macrosismique qui s'est dĂ©roulĂ©e du 18 au 22 novembre 2019, suite au sĂ©isme du 11 novembre 2019 de magnitude 5.2 Mlv. On peut voir un endommagement d’une entrĂ©e Ă  une cave sur la commune du Teil, rue Jean Vernet. Il s'agit de la commune la plus touchée, avec des effondrements de bâtiments. Du point de vue des intensitĂ©s, le sĂ©isme sur cette commune a atteint une intensitĂ© de VII (sur une Ă©chelle allant de I Ă  XII). La très faible profondeur du foyer du séisme (environ 2 km), ainsi que la propagation de la rupture jusqu’en surface, impliquent une intensité des secousses bien plus importante dans la zone épicentrale (jusqu’à environ 15 km de l’épicentre) que pour les évènements plus classiques de même magnitude (profondeur autour de 10 km). Les dommages importants sur la commune du Teil en sont une illustration. Ce séisme est le plus important en métropole en termes d’impact (étendue des intensités VI et plus, et des dégâts sur les bâtiments les plus vulnérables) depuis 52 ans (depuis le séisme d’Arette de 1967). Le groupe d'intervention macrosismique intervient sur les lieux des tremblements de terre pour Ă©valuer l'intensitĂ© de la secousse, Ă  partir des effets du sĂ©isme sur les structures, bĂątiments, maisons individuelles. Ces observations de terrain complĂštent les tĂ©moignages fournis par les citoyens sur le site france-seisme. Elles sont l'un des Ă©lĂ©ments qui participent Ă  l'Ă©tablissement de l'Ă©tat de catastrophe naturelle par les autoritĂ©s. L'enquĂȘte macrosismique complĂšte Ă©galement les autres analyses rĂ©alisĂ©es les scientifiques au sein de la communautĂ© du RĂ©seau sismologique et gĂ©odĂ©sique français RĂ©sif, notamment dans le cadre de son Action transverse sismicitĂ©. RĂ©sif est une infrastructure de recherche nationale dĂ©diĂ©e Ă  l’observation et la comprĂ©hension de la structure et de la dynamique Terre interne. RĂ©sif se base sur des rĂ©seaux d’observation de haut niveau technologique, composĂ©s d’instruments sismologiques, gĂ©odĂ©siques et gravimĂ©triques dĂ©ployĂ©s de maniĂšre dense sur tout le territoire français. Les donnĂ©es recueillies permettent d’étudier avec une haute rĂ©solution spatio-temporelle la dĂ©formation du sol, les structures superficielles et profondes, la sismicitĂ© Ă  l’échelle locale et globale et les alĂ©as naturels, et plus particuliĂšrement sismiques, sur le territoire français. RĂ©sif s’intĂšgre aux dispositifs europĂ©ens (EPOS - European Plate Observing System) et mondiaux d’instruments permettant d’imager l’intĂ©rieur de la Terre dans sa globalitĂ© et d’étudier de nombreux phĂ©nomĂšnes naturels

    Un membre du groupe d'intervention Macrosismique dans le village du Teil lors de la mission relative au séisme de 5.2 Mlv prÚs de Montélimar le 11 novembre 2019

    No full text
    On November 11, 2019 at 10:52 a 5.2 MLv earthquake occurred near MontĂ©limar. Between Monday 18 and Friday 22 November, a team from the Macroseismic Response Group (BCSF), divided into pairs or groups of three, inspected more than 20 municipalities, met with elected officials and sometimes with the fire brigade. In most cases, they observe cracks, but in the most affected areas of the Teil, some old buildings are largely collapsed.This photo shows a member of the Macroseismic Response Group in the village of Le Teil during the 5.2 Mlv earthquake mission near MontĂ©limar on November 11, 2019.The macroseismic response group intervenes at earthquake sites to assess the intensity of the earthquake, based on the effects of the earthquake on structures, buildings and individual houses. These field observations complement the testimonies provided by citizens on the france-seisme site. They are one of the elements that contribute to the establishment of the state of natural disaster by the authorities.The macroseismic survey also complements the other analyses carried out by scientists within the community of the French seismological and geodetic network RĂ©sif, in particular within the framework of its Transversal Seismicity Action.RĂ©sif is a national research infrastructure dedicated to the observation and understanding of the structure and dynamics of the Inner Earth. RĂ©sif is based on high-tech observation networks, composed of seismological, geodetic and gravimetric instruments deployed in a dense manner throughout France. The data collected make it possible to study with high spatial and temporal resolution the deformation of the ground, surface and deep structures, seismicity on a local and global scale and natural hazards, and more particularly seismic events, on French territory. RĂ©sif is integrated into European (EPOS - European Plate Observing System) and global systems of instruments for imaging the Earth's interior as a whole and studying many natural phenomena.Le 11 novembre 2019 Ă  10h52 un sĂ©isme d'une magnitude 5,2 MLv se produit Ă  proximitĂ© de MontĂ©limar. Entre le lundi 18 et le vendredi 22 novembre, une Ă©quipe du groupe d'intervention macrosismique (BCSF) rĂ©partie en binĂŽmes ou groupes de trois a inspectĂ© plus de 20 communes, rencontrĂ© les Ă©lus et parfois les pompiers. Dans la majoritĂ© des cas, ils observent des fissures, mais sur les zones les plus sinistrĂ©es du Teil, certains bĂątiments anciens sont en grande partie effondrĂ©s.Cette photo montre un membre du groupe d'intervention Macrosismique dans le village du Teil lors de la mission relative au sĂ©isme de 5.2 Mlv prĂšs de MontĂ©limar le 11 novembre 2019.Le groupe d'intervention macrosismique intervient sur les lieux des tremblements de terre pour Ă©valuer l'intensitĂ© de la secousse, Ă  partir des effets du sĂ©isme sur les structures, bĂątiments, maisons individuelles. Ces observations de terrain complĂštent les tĂ©moignages fournis par les citoyens sur le site france-seisme. Elles sont l'un des Ă©lĂ©ments qui participent Ă  l'Ă©tablissement de l'Ă©tat de catastrophe naturelle par les autoritĂ©s.L'enquĂȘte macrosismique complĂšte Ă©galement les autres analyses rĂ©alisĂ©es les scientifiques au sein de la communautĂ© du RĂ©seau sismologique et gĂ©odĂ©sique français RĂ©sif, notamment dans le cadre de son Action transverse sismicitĂ©.RĂ©sif est une infrastructure de recherche nationale dĂ©diĂ©e Ă  l’observation et la comprĂ©hension de la structure et de la dynamique Terre interne. RĂ©sif se base sur des rĂ©seaux d’observation de haut niveau technologique, composĂ©s d’instruments sismologiques, gĂ©odĂ©siques et gravimĂ©triques dĂ©ployĂ©s de maniĂšre dense sur tout le territoire français. Les donnĂ©es recueillies permettent d’étudier avec une haute rĂ©solution spatio-temporelle la dĂ©formation du sol, les structures superficielles et profondes, la sismicitĂ© Ă  l’échelle locale et globale et les alĂ©as naturels, et plus particuliĂšrement sismiques, sur le territoire français. RĂ©sif s’intĂšgre aux dispositifs europĂ©ens (EPOS - European Plate Observing System) et mondiaux d’instruments permettant d’imager l’intĂ©rieur de la Terre dans sa globalitĂ© et d’étudier de nombreux phĂ©nomĂšnes naturels

    SĂ©isme du Teil. 11 novembre 2019. Le Teil. Fissure sur une maison

    No full text
    This photo was taken during a Macroseismic Response Group mission that took place from November 18 to 22, 2019, following the November 11, 2019 earthquake of magnitude 5.2 Mlv. An example of a crack can be seen in the commune of Le Teil, rue Jean Vernet. This is the most affected commune, with building collapses. From the point of view of intensity, the earthquake on this town reached an intensity of VII (on a scale from I to XII). The very shallow depth of the focus of the earthquake (about 2 km), as well as the propagation of the rupture to the surface, imply a much greater intensity of shaking in the epicentral area (up to about 15 km from the epicenter) than for more conventional events of the same magnitude (depth around 10 km). The significant damage to the town of Le Teil is an illustration. This earthquake is the largest in mainland France in terms of impact (extent of intensity VI and above, and damage to the most vulnerable buildings) for 52 years (since the earthquake of Arette in 1967). The macro-seismic intervention group intervenes on the sites of earthquakes to evaluate the intensity of the tremor, from the effects of the earthquake on structures, buildings, individual houses. These field observations complement the testimonies provided by citizens on the france-seisme website. They are one of the elements that participate in the establishment of the state of natural disaster by the authorities. The macro-seismic survey also completes the other analyses carried out by scientists within the French seismological and geodesic network RĂ©sif, in particular within the framework of its Transverse Action Seismicity. RĂ©sif is a national research infrastructure dedicated to the observation and understanding of the Earth's internal structure and dynamics. RĂ©sif is based on high technology observation networks, composed of seismological, geodesic and gravimetric instruments deployed in a dense way on the whole French territory. The data collected allow to study with a high spatio-temporal resolution the ground deformation, the superficial and deep structures, the seismicity at the local and global scale and the natural hazards, and more particularly the seismic ones, on the French territory. RĂ©sif is part of the European (EPOS - European Plate Observing System) and global systems of instruments allowing to image the interior of the Earth in its entirety and to study many natural phenomena.Cette photo a Ă©tĂ© prise lors d'une mission du Groupe d'intervention macrosismique qui s'est dĂ©roulĂ©e du 18 au 22 novembre 2019, suite au sĂ©isme du 11 novembre 2019 de magnitude 5.2 Mlv. On peut voir un exemple de fissure sur la commune du Teil, rue Jean Vernet. Il s'agit de la commune la plus touchée, avec des effondrements de bâtiments. Du point de vue des intensitĂ©s, le sĂ©isme sur cette commune a atteint une intensitĂ© de VII (sur une Ă©chelle allant de I Ă  XII). La très faible profondeur du foyer du séisme (environ 2 km), ainsi que la propagation de la rupture jusqu’en surface, impliquent une intensité des secousses bien plus importante dans la zone épicentrale (jusqu’à environ 15 km de l’épicentre) que pour les évènements plus classiques de même magnitude (profondeur autour de 10 km). Les dommages importants sur la commune du Teil en sont une illustration. Ce séisme est le plus important en métropole en termes d’impact (étendue des intensités VI et plus, et des dégâts sur les bâtiments les plus vulnérables) depuis 52 ans (depuis le séisme d’Arette de 1967). Le groupe d'intervention macrosismique intervient sur les lieux des tremblements de terre pour Ă©valuer l'intensitĂ© de la secousse, Ă  partir des effets du sĂ©isme sur les structures, bĂątiments, maisons individuelles. Ces observations de terrain complĂštent les tĂ©moignages fournis par les citoyens sur le site france-seisme. Elles sont l'un des Ă©lĂ©ments qui participent Ă  l'Ă©tablissement de l'Ă©tat de catastrophe naturelle par les autoritĂ©s. L'enquĂȘte macrosismique complĂšte Ă©galement les autres analyses rĂ©alisĂ©es les scientifiques au sein de la communautĂ© du RĂ©seau sismologique et gĂ©odĂ©sique français RĂ©sif, notamment dans le cadre de son Action transverse sismicitĂ©. RĂ©sif est une infrastructure de recherche nationale dĂ©diĂ©e Ă  l’observation et la comprĂ©hension de la structure et de la dynamique Terre interne. RĂ©sif se base sur des rĂ©seaux d’observation de haut niveau technologique, composĂ©s d’instruments sismologiques, gĂ©odĂ©siques et gravimĂ©triques dĂ©ployĂ©s de maniĂšre dense sur tout le territoire français. Les donnĂ©es recueillies permettent d’étudier avec une haute rĂ©solution spatio-temporelle la dĂ©formation du sol, les structures superficielles et profondes, la sismicitĂ© Ă  l’échelle locale et globale et les alĂ©as naturels, et plus particuliĂšrement sismiques, sur le territoire français. RĂ©sif s’intĂšgre aux dispositifs europĂ©ens (EPOS - European Plate Observing System) et mondiaux d’instruments permettant d’imager l’intĂ©rieur de la Terre dans sa globalitĂ© et d’étudier de nombreux phĂ©nomĂšnes naturels

    Un membre du groupe d'intervention Macrosismique aux cÎtés d'un pompier lors de la mission relative au séisme de 5.2 Mlv prÚs de Montélimar le 11 novembre 2019

    No full text
    On November 11, 2019 at 10:52 a 5.2 MLv earthquake occurred near MontĂ©limar. Between Monday 18 and Friday 22 November, a team from the Macroseismic Response Group (BCSF), divided into pairs or groups of three, inspected more than 20 municipalities, met with elected officials and sometimes with the fire brigade. In most cases, they observe cracks, but in the most affected areas of the Teil, some old buildings are largely collapsed.This photo shows a member of the Macroseismic Response Group with a firefighter during the 5.2 Mlv earthquake mission near MontĂ©limar on November 11, 2019.The macro-seismic response group intervenes at earthquake sites to assess the intensity of the earthquake, based on the effects of the earthquake on structures, buildings and individual houses. These field observations complement the testimonies provided by citizens on the france-seisme site. They are one of the elements that contribute to the establishment of the state of natural disaster by the authorities.The macro-seismic survey also complements the other analyses carried out by scientists within the community of the French seismological and geodetic network RĂ©sif, in particular within the framework of its Transversal Seismicity Action.RĂ©sif is a national research infrastructure dedicated to the observation and understanding of the structure and dynamics of the Inner Earth. RĂ©sif is based on high-tech observation networks, composed of seismological, geodetic and gravimetric instruments deployed in a dense manner throughout France. The data collected make it possible to study with high spatial and temporal resolution the deformation of the ground, surface and deep structures, seismicity on a local and global scale and natural hazards, and more particularly seismic events, on French territory. RĂ©sif is integrated into European (EPOS - European Plate Observing System) and global systems of instruments for imaging the Earth's interior as a whole and studying many natural phenomena.Le 11 novembre 2019 Ă  10h52 un sĂ©isme d'une magnitude 5,2 MLv se produit Ă  proximitĂ© de MontĂ©limar. Entre le lundi 18 et le vendredi 22 novembre, une Ă©quipe du groupe d'intervention macrosismique (BCSF) rĂ©partie en binĂŽmes ou groupes de trois a inspectĂ© plus de 20 communes, rencontrĂ© les Ă©lus et parfois les pompiers. Dans la majoritĂ© des cas, ils observent des fissures, mais sur les zones les plus sinistrĂ©es du Teil, certains bĂątiments anciens sont en grande partie effondrĂ©s.Cette photo montre un membre du groupe d'intervention Macrosismique aux cĂŽtĂ©s d'un pompier lors de la mission relative au sĂ©isme de 5.2 Mlv prĂšs de MontĂ©limar le 11 novembre 2019.Le groupe d'intervention macrosismique intervient sur les lieux des tremblements de terre pour Ă©valuer l'intensitĂ© de la secousse, Ă  partir des effets du sĂ©isme sur les structures, bĂątiments, maisons individuelles. Ces observations de terrain complĂštent les tĂ©moignages fournis par les citoyens sur le site france-seisme. Elles sont l'un des Ă©lĂ©ments qui participent Ă  l'Ă©tablissement de l'Ă©tat de catastrophe naturelle par les autoritĂ©s.L'enquĂȘte macrosismique complĂšte Ă©galement les autres analyses rĂ©alisĂ©es les scientifiques au sein de la communautĂ© du RĂ©seau sismologique et gĂ©odĂ©sique français RĂ©sif, notamment dans le cadre de son Action transverse sismicitĂ©.RĂ©sif est une infrastructure de recherche nationale dĂ©diĂ©e Ă  l’observation et la comprĂ©hension de la structure et de la dynamique Terre interne. RĂ©sif se base sur des rĂ©seaux d’observation de haut niveau technologique, composĂ©s d’instruments sismologiques, gĂ©odĂ©siques et gravimĂ©triques dĂ©ployĂ©s de maniĂšre dense sur tout le territoire français. Les donnĂ©es recueillies permettent d’étudier avec une haute rĂ©solution spatio-temporelle la dĂ©formation du sol, les structures superficielles et profondes, la sismicitĂ© Ă  l’échelle locale et globale et les alĂ©as naturels, et plus particuliĂšrement sismiques, sur le territoire français. RĂ©sif s’intĂšgre aux dispositifs europĂ©ens (EPOS - European Plate Observing System) et mondiaux d’instruments permettant d’imager l’intĂ©rieur de la Terre dans sa globalitĂ© et d’étudier de nombreux phĂ©nomĂšnes naturels

    SĂ©isme du Teil. 11 novembre 2019. La RouviĂšre. Fissure sur une maison

    No full text
    This photo was taken during a mission of the Macroseismic Response Group that took place from November 18 to 22, 2019, following the November 11, 2019 earthquake of magnitude 5.2 Mlv. An example of a crack can be seen in the commune of Le Teil, more precisely the neighborhood of La RouviĂšre. It is the most affected area because it is very close to the fault. From the point of view of intensity, the earthquake on this town reached an intensity of VIII (on a scale from I to XII). The very shallow depth of the focus of the earthquake (about 2 km), as well as the propagation of the rupture to the surface, imply a much greater intensity of shaking in the epicentral zone (up to about 15 km from the epicenter) than for more conventional events of the same magnitude (depth around 10 km). The significant damage to the town of Le Teil is an illustration. This earthquake is the largest in mainland France in terms of impact (extent of intensity VI and above, and damage to the most vulnerable buildings) for 52 years (since the earthquake of Arette in 1967). The macro-seismic intervention group intervenes on the sites of earthquakes to evaluate the intensity of the tremor, from the effects of the earthquake on structures, buildings, individual houses. These field observations complement the testimonies provided by citizens on the france-seisme website. They are one of the elements that participate in the establishment of the state of natural disaster by the authorities. The macro-seismic survey also completes the other analyses carried out by scientists within the French seismological and geodesic network RĂ©sif, in particular within the framework of its Transverse Action Seismicity. RĂ©sif is a national research infrastructure dedicated to the observation and understanding of the Earth's internal structure and dynamics. RĂ©sif is based on high technology observation networks, composed of seismological, geodesic and gravimetric instruments deployed in a dense way on the whole French territory. The data collected allow to study with a high spatio-temporal resolution the ground deformation, the superficial and deep structures, the seismicity at the local and global scale and the natural hazards, and more particularly the seismic ones, on the French territory. RĂ©sif is part of the European (EPOS - European Plate Observing System) and global systems of instruments allowing to image the interior of the Earth in its entirety and to study many natural phenomena.Cette photo a Ă©tĂ© prise lors d'une mission du Groupe d'intervention macrosismique qui s'est dĂ©roulĂ©e du 18 au 22 novembre 2019, suite au sĂ©isme du 11 novembre 2019 de magnitude 5.2 Mlv. On peut voir un exemple de fissure sur la commune du Teil, plus prĂ©cisĂ©ment le quartier de La RouviĂšre. C'est le quartier le plus touchĂ© car trĂšs proche de la faille. Du point de vue des intensitĂ©s, le sĂ©isme sur cette commune a atteint une intensitĂ© de VIII (sur une Ă©chelle allant de I Ă  XII). La très faible profondeur du foyer du séisme (environ 2 km), ainsi que la propagation de la rupture jusqu’en surface, impliquent une intensité des secousses bien plus importante dans la zone épicentrale (jusqu’à environ 15 km de l’épicentre) que pour les évènements plus classiques de même magnitude (profondeur autour de 10 km). Les dommages importants sur la commune du Teil en sont une illustration. Ce séisme est le plus important en métropole en termes d’impact (étendue des intensités VI et plus, et des dégâts sur les bâtiments les plus vulnérables) depuis 52 ans (depuis le séisme d’Arette de 1967). Le groupe d'intervention macrosismique intervient sur les lieux des tremblements de terre pour Ă©valuer l'intensitĂ© de la secousse, Ă  partir des effets du sĂ©isme sur les structures, bĂątiments, maisons individuelles. Ces observations de terrain complĂštent les tĂ©moignages fournis par les citoyens sur le site france-seisme. Elles sont l'un des Ă©lĂ©ments qui participent Ă  l'Ă©tablissement de l'Ă©tat de catastrophe naturelle par les autoritĂ©s. L'enquĂȘte macrosismique complĂšte Ă©galement les autres analyses rĂ©alisĂ©es les scientifiques au sein de la communautĂ© du RĂ©seau sismologique et gĂ©odĂ©sique français RĂ©sif, notamment dans le cadre de son Action transverse sismicitĂ©. RĂ©sif est une infrastructure de recherche nationale dĂ©diĂ©e Ă  l’observation et la comprĂ©hension de la structure et de la dynamique Terre interne. RĂ©sif se base sur des rĂ©seaux d’observation de haut niveau technologique, composĂ©s d’instruments sismologiques, gĂ©odĂ©siques et gravimĂ©triques dĂ©ployĂ©s de maniĂšre dense sur tout le territoire français. Les donnĂ©es recueillies permettent d’étudier avec une haute rĂ©solution spatio-temporelle la dĂ©formation du sol, les structures superficielles et profondes, la sismicitĂ© Ă  l’échelle locale et globale et les alĂ©as naturels, et plus particuliĂšrement sismiques, sur le territoire français. RĂ©sif s’intĂšgre aux dispositifs europĂ©ens (EPOS - European Plate Observing System) et mondiaux d’instruments permettant d’imager l’intĂ©rieur de la Terre dans sa globalitĂ© et d’étudier de nombreux phĂ©nomĂšnes naturels
    • 

    corecore