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Deep mass redistribution prior to the 2010 Mw 8.8 Maule (Chile) Earthquake revealed by GRACE satellite gravity / Marie Bouih in Earth and planetary science letters, vol 584 (15 April 2022)  

Public [article]  inEarth and planetary science letters > vol 584 (15 April 2022) . - n° 117465 Titre : Deep mass redistribution prior to the 2010 Mw 8.8 Maule (Chile) Earthquake revealed by GRACE satellite gravity Type de document : Article/Communication Auteurs : Marie Bouih , Auteur ; Isabelle Panet , Auteur ; Dominique Remy, Auteur ; Laurent Longuevergne, Auteur ; Sylvain Bonvalot, Auteur Année de publication : 2022 Projets : Université de Paris / Clerici, Christine Article en page(s) : n° 117465 Note générale : bibliographie This study contributes to the IdEx Université de Paris ANR-18-IDEX-0001. Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] champ de pesanteur terrestre [Termes IGN] Chili [Termes IGN] déformation de la croute terrestre [Termes IGN] données GRACE [Termes IGN] gradient de gravitation [Termes IGN] jeu de données [Termes IGN] levé gravimétrique [Termes IGN] prévention des risques [Termes IGN] risque naturel [Termes IGN] séisme [Termes IGN] signal [Termes IGN] subduction [Termes IGN] tectonique des plaques Résumé : (auteur) Subduction zones megathrust faults constitute a considerable hazard as they produce most of the world's largest earthquakes. However, the role in megathrust earthquake generation exerted by deeper subduction processes remains poorly understood. Here, we analyze the 2003 – 2014 space-time variations of the Earth's gravity gradients derived from three datasets of GRACE geoid models over a large region surrounding the rupture zone of the Mw 8.8 Maule earthquake. In all these datasets, our analysis reveals a large-amplitude gravity gradient signal, progressively increasing in the three months before the earthquake, North of the epicentral area. We show that such signals are equivalent to a water storage decrease over 2 months and cannot be explained by hydrological sources nor artefacts, but rather find origin from mass redistributions within the solid Earth on the continental side of the subduction zone. These gravity gradient variations could be explained by an extensional deformation of the slab around 150-km depth along the Nazca Plate subduction direction, associated with large-scale fluid release. Furthermore, the lateral migration of the gravity signal towards the surface from a low coupling segment around North to the high coupling one in the South suggests that the Mw 8.8 earthquake may have originated from the propagation up to the trench of this deeper slab deformation. Our results highlight the importance of observations of the Earth's time-varying gravity field from satellites in order to probe slow mass redistributions in-depth major plate boundaries and provide new information on dynamic processes in the subduction system, essential to better understand the seismic cycle as a whole. Numéro de notice : A2022-280 Affiliation des auteurs : UMR IPGP-Géod+Ext (2020- ) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.epsl.2022.117465 En ligne : https://doi.org/10.1016/j.epsl.2022.117465 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100288 [article]

Topoclimatic zoning of continental Chile / Donna Cortez in Journal of maps, vol 17 n° 2 (February 2021)  

Public [article]  inJournal of maps > vol 17 n° 2 (February 2021) . - *pp 114 - 124 Titre : Topoclimatic zoning of continental Chile Type de document : Article/Communication Auteurs : Donna Cortez, Auteur ; Sebastián Herrera, Auteur ; Daniela Araya-Osses, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : *pp 114 - 124 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse de groupement [Termes IGN] analyse en composantes principales [Termes IGN] carte climatique [Termes IGN] Chili [Termes IGN] climat continental [Termes IGN] climat de montagne [Termes IGN] climatologie [Termes IGN] littoral [Termes IGN] partition d'image [Termes IGN] topographie locale Résumé : (article) In this study, the topoclimates of continental Chile are mapped. The mapping involves the identification of homogeneous zones based on the relationships between the climatic variables that characterize a location and the topography that influences the spatial behavior of these variables. The climatic and topographical zoning of the study area is conducted using a statistical methodology based on a combination of principal component analysis and cluster analysis. The climate, topography, and topoclimatic zoning yield 20, 8, and 96 clusters, respectively. Maximum topoclimatic variability is identified in sectors with mountain ranges and intermediate depression (especially in valley areas), and minimum variability is detected in the coastal sector. Furthermore, only one of the topoclimatic units has an area larger than 50,000 km2, whereas 46.8% of the units have surface areas below 2,000 km2. Numéro de notice : A2021-410 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/17445647.2021.1886188 Date de publication en ligne : 10/03/2021 En ligne : https://doi.org/10.1080/17445647.2021.1886188 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97732 [article]

A study of the influence of the historical snow accumulation and wind effects on the extended Chajnantor plateau / Juliette Ortet (2018) 

Public Titre : A study of the influence of the historical snow accumulation and wind effects on the extended Chajnantor plateau Type de document : Mémoire Auteurs : Juliette Ortet, Auteur Editeur : Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG Année de publication : 2018 Importance : 48 p. Format : 21 x 30 cm Note générale : bibliographie Rapport de projet pluridisciplinaire, cycle Ingénieur 2e année Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Chili [Termes IGN] dynamique des fluides [Termes IGN] image Sentinel-MSI [Termes IGN] manteau neigeux [Termes IGN] modèle numérique de surface [Termes IGN] observatoire astronomique [Termes IGN] réseau routier [Termes IGN] vent Index. décimale : PROJET Mémoires : Rapports de projet - stage des ingénieurs de 2e année Résumé : (auteur) L’European Southern Observatory (ESO) possède plusieurs observatoires astronomiques au Nord du Chili. La situation de chaque observatoire est soigneusement choisie. Les conditions environnantes jouent un rôle majeur dans cette décision. Cette étude a pour but d’aider une telle décision par le biais d’outils d’analyse de la couverture neigeuse et des effets du vents sur le plateau de Chajnantor. L’enneigement peut être détecté grâce à la télédétection. L’analyse spatial peut mener à mieux connaître les effets de la neige sur le réseau routier menant aux télescopes. La dynamique des fluides numérique permet l’établissement de modèles de vent locaux dont la précision repose avant tout sur la topographie locale et les propriétés physiques du fluide considéré. Pour fournir ces résultats, une automatisation des processus est mise en oeuvre. Note de contenu : Introduction 1- A study of the historical snow accumulation 2- A study of the influence of wind Conclusion Numéro de notice : 21807 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Mémoire de projet pluridisciplinaire Organisme de stage : European Southern Observatory Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91296

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Determining forest degradation, ecosystem state and resilience using a standard stand stocking measurement diagram: theory into practice / Carlos Bahamondez in Forestry, an international journal of forest research, vol 89 n° 3 (July 2016)  

Public [article]  inForestry, an international journal of forest research > vol 89 n° 3 (July 2016) . - pp 290 - 300 Titre : Determining forest degradation, ecosystem state and resilience using a standard stand stocking measurement diagram: theory into practice Type de document : Article/Communication Auteurs : Carlos Bahamondez, Auteur ; Ian D. Thompson, Auteur Année de publication : 2016 Article en page(s) : pp 290 - 300 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Chili [Termes IGN] dégradation de la flore [Termes IGN] écosystème forestier [Termes IGN] forêt de production [Termes IGN] Nothofagus (genre) [Termes IGN] productivité [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Forest degradation is a major issue for policy-makers that is exacerbated by no clear and globally accepted definition of the term. For forest managers, a loss of forest productive capacity is one form of forest degradation. We present a quantitative method to assess forest degradation from a productivity perspective. Our method uses a standard stocking chart and calculation methods based on standard forest inventory data, to derive a clear threshold value for stocking, below which a forest should be considered degraded. The method is illustrated using the example of a self-regenerating Nothofagus production forest type from Chile. For that forest type, we determined that harvesting trees to below a specific basal area relative to site type, resulted in a loss of resilience, an unpredictable shift in ecosystem state, and a degraded condition. Our method illustrates how over-harvesting can degrade the long-term productivity of a stand and forest resilience. Nevertheless, it is important to consider that forests can also be degraded from other perspectives, such as loss of biodiversity, carbon, or protective functions as a result of excessive disturbances. Ecosystem management requires that managers consider degradation from a range of perspectives. We see the quantified approach used here as a way to provide practitioners with, in part, a transition from sustained yield to ecosystem management with an ultimate objective of providing a pathway towards adaptive management of complex systems and avoiding degradation. Numéro de notice : A2016--136 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article En ligne : https://doi.org/10.1093/forestry/cpv052 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85779 [article]

Investigating the possible impact of atmospheric CO2 increase on Araucaria araucana wood density / Paulina E. Pinto in European Journal of Forest Research, vol 135 n° 2 (April 2016)  

Public [article]  inEuropean Journal of Forest Research > vol 135 n° 2 (April 2016) . - pp 389 - 401 Titre : Investigating the possible impact of atmospheric CO2 increase on Araucaria araucana wood density Type de document : Article/Communication Auteurs : Paulina E. Pinto, Auteur ; Jean-Daniel Bontemps , Auteur ; Jean-Claude Pierrat, Auteur ; Tony Franceschini, Auteur ; Pierre Gelhaye, Auteur ; Jean-Claude Gégout, Auteur ; Jean-Michel Leban , Auteur Année de publication : 2016 Article en page(s) : pp 389 - 401 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Environnement [Termes IGN] Araucaria araucana [Termes IGN] Chili [Termes IGN] Cordillère des Andes [Termes IGN] dendrométrie [Termes IGN] densité du bois [Termes IGN] forêt tempérée [Termes IGN] puits de carbone Résumé : (auteur) Our aim was to investigate the possible enhancing role of long-term atmospheric CO2 increase on wood density as an essential component of biomass sequestration. We therefore assessed the long-term evolution of wood density over pre-industrial and contemporary periods, in a regional context free of management practices, atmospheric deposition and with restricted climatic change. Dominant trees of Araucaria araucana were sampled in 37 stands distributed throughout its natural distribution over temperate forests of the Chilean Andes Cordillera. Mean ring density (MRD) at 1.30 m was measured by X-ray micro-densitometry. A third-century MRD chronology was built after MRD standardisation by the effects of cambial age and radial growth, simultaneously estimated from a statistical model from rings of the pre-industrial period (1700–1850) to avoid any temporal bias. The age-alone standardised MRD chronology showed restricted fluctuations ranging between 2.0 and 3.2 % over the last three centuries. Multi-decennial fluctuations between ring width and MRD were found qualitatively synchronous and opposed. Accordingly, MRD fluctuations were removed with the age and growth standardisation, highlighting the absence of a historical wood density trend at constant ring size over the whole period. Over the most recent decades however, a slight increase in density was identified, with loss of synchronisation to radial growth. The absence of a long-term signal in wood density of A. araucana, in a context of restricted anthropogenic influence, differs markedly from reports of significant decreases in the Northern Hemisphere. We conclude as part of the analysis done that until now, increasing atmospheric CO2 unlikely would have an impact in wood density. Numéro de notice : A2016--085 Affiliation des auteurs : LIF+Ext (2012-2019) Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10342-016-0942-2 Date de publication en ligne : 03/03/2016 En ligne : http://doi.org/10.1007/s10342-016-0942-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84570 [article]

Le GPS dévoile les liens entre les grands séismes de subduction au Chili / Emilie Klein in XYZ, n° 146 (mars - mai 2016) 

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Spatial data infrastructure in Chile is mature and expanding / Alvaro Monett Hernandéz in GIM international [en ligne], vol 30 n° 2 (February 2016)

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Monitoring of chronological stages of deforestation-afforestation: the case of Southern Chile / Nicolas Maestripieri in Photo interpretation, European journal of applied remote sensing, vol 51 n° 3 (septembre 2015)

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A first in-flight absolute calibration of the Chilean Earth Observation Satellite / C. Mattar in ISPRS Journal of photogrammetry and remote sensing, vol 92 (June 2014)  

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Automatisation des calculs GPS des stations permanentes chiliennes / Pierre Cruchandeau (2014) 

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Processing and calibration of submillimeter Fourier transform radiometer spectra from the RHUBC-II campaign / Scott N. Paine in IEEE Transactions on geoscience and remote sensing, vol 51 n° 12 (December 2013)  

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Photogrammetric techniques for the determination of spatio-temporal velocity fields at glaciar San Rafael, Chile / Hans-Gerd Maas in Photogrammetric Engineering & Remote Sensing, PERS, vol 79 n° 3 (March 2013)  

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Mapping dreams/Dreaming maps: Bridging indigenous and western geographical knowledge / I. Hirt in Cartographica, vol 47 n° 2 (June 2012)  

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L'image dans la ville : l'affichage mural et ses contextes à Santiago du Chili / P. Velasquez in Le monde des cartes, n° 204 (juin 2010)

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Méditerranéité au Chili : climat, flore et végétation / Henry-Noël Le Houerou in Forêt méditerranéenne, vol 30 n° 1 (mars 2009)

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