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Termes IGN > sciences naturelles > sciences de la Terre et de l'univers > géosciences > géophysique interne > sismologie > séisme
séismeSynonyme(s)Tremblement de terre |
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Titre : Analysing normal modes of the Earth from high-rate GNSS time series Type de document : Mémoire Auteurs : Zhongyi Chen, Auteur Editeur : Stuttgart : University of Stuttgart Année de publication : 2017 Importance : 78 p. Format : 21 x 30 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] déformation de la croute terrestre
[Termes IGN] oscillation
[Termes IGN] positionnement différentiel
[Termes IGN] positionnement ponctuel précis
[Termes IGN] rapport signal sur bruit
[Termes IGN] séisme
[Termes IGN] série temporelleRésumé : (auteur) Normal modes of the Earth, or Earth’s free oscillations, correspond to a global deformation of the Earth that vibrates at different frequencies, like a bell, after a strong excitation, usually an earthquake of magnitude greater than 6.5. Normal modes of the Earth were first described by Lord Kelvin (Kelvin, 1863) with a computation of the lowest fundamental spheroidal mode 0S2 frequency for a homogeneous Earth model (Lognonné and Clévédé, 2002). With the theory and the deployment of the first long-period sensors in the late 1950s, day-scale Earth’s free oscillation after large earthquakes has been detected by underground instruments such as strainmeters, gravimeters and seismometers (Benioff et al., 1961) (Dziewonski and Gilbert, 1972) (Mendiguren, 1973). In the 1960s, since the U.S. military developed the first satellite navigation system, Transit, the era of Global Navigation Satellite System (GNSS) has arrived. Among all navigation satellite systems, Global Positioning System (GPS), operated by the U.S. Department of Defense (DOD), is currently the world’s most utilized satellite navigation system. With the developments of receiver technology and sampling capability, GPS becomes a powerful tool to study long-period Earth deformations such as plate tectonics and post-glacial rebound, or to monitoring short-period and short-duration motion such as waves generated by earthquakes (Bilich et al., 2008). In recent years, several studies have demonstrated the effective use of GPS in estimating coseismic displacement waveforms induced by an earthquake with accuracies ranging from a few millimeters to a few centimeters. In these studies, two well-known processing strategies, single Precise Point Positioning (PPP) and Different Positioning (DP), have been used to reduce the latency between earthquake occurrence and coseimic displacement waveforms estimation. In this thesis, a new approach named Variometric Approach for Displacements Analysis Standalone Engine (VADASE) is used to detect the normal modes of the Earth. Then the Welch’s PSD estimate is applied to transform the time series into frequency domain. Several simulations have been performed on synthetic time series to investigate the influence of noise level, sampling rate, time series length, window size and overlapping rate of Welch’s method, as well as the influence of stacking. The experiments on real data show the capability of VADASE time series for detecting normal modes of the Earth with the help of the stacking method. Some fundamental modes with small amplitude are not visible because the SNR is not sufficient to lift the signal out of the noise. Note de contenu : 1- Normal modes of the Earth
2- GPS system
3- GPS positioning
4- GPS data processing
5- Spectral analysis
6- Simulations
7- Experiments on real Vadase time seriesNuméro de notice : 17576 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Mémoire masters divers DOI : 10.18419/opus-9317 En ligne : http://dx.doi.org/10.18419/opus-9317 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92281 Crustal deformation caused by the 2016 Kumamoto earthquake revealed by GEONET / Satoshi Kawamoto in Bulletin of the GeoSpatial Information authority of Japan, vol 64 (December 2016)
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Titre : Crustal deformation caused by the 2016 Kumamoto earthquake revealed by GEONET Type de document : Article/Communication Auteurs : Satoshi Kawamoto, Auteur ; Yohei Hiyama, Auteur ; Reiko Kai, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 27 - 33 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] déformation de la croute terrestre
[Termes IGN] faille géologique
[Termes IGN] GeoNet
[Termes IGN] Japon
[Termes IGN] Kyushu (Japon)
[Termes IGN] positionnement par GNSS
[Termes IGN] réseau géodésique local
[Termes IGN] séismeRésumé : (auteur) GNSS observation over the area of the 2016 Kumamoto Earthquake (April 14-16, 2016) reveals coseismic deformations of over 10 centimeters caused by the two large foreshocks and of ~ 1 meter caused by the mainshock as well as a postseismic deformation of up to a few centimeters. Large displacements are concentrated around Futagawa-Hinagu fault zone which is a known active fault in Kyushu Island. Kinematic positioning results imply the two large foreshocks initiated a rupture on the northern part of the Hinagu fault segment, then a rupture neighboring the southern part of the segment. The postseismic deformations that followed seem to be similar to the pattern of coseismic deformation, however, they are widely distributed. The sequence of earthquakes caused significant distortion in the Japanese geodetic datum around the focal area, but GEONET observation enabled a rapid response. Furthermore, it is believed the observation data provided by GEONET will make a significant contribution to understand the fault property along the active fault zone. Numéro de notice : A2016--077 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000150876.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84506
in Bulletin of the GeoSpatial Information authority of Japan > vol 64 (December 2016) . - pp 27 - 33[article]Detection of ground surface deformation caused by the 2016 Kumamoto earthquake by InSAR using ALOS-2 data / Basara Miyahara in Bulletin of the GeoSpatial Information authority of Japan, vol 64 (December 2016)
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Titre : Detection of ground surface deformation caused by the 2016 Kumamoto earthquake by InSAR using ALOS-2 data Type de document : Article/Communication Auteurs : Basara Miyahara, Auteur ; Yuji Miura, Auteur ; Yasuaki Kakiage, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 21 - 26 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] bande L
[Termes IGN] déformation de la croute terrestre
[Termes IGN] faille géologique
[Termes IGN] image ALOS
[Termes IGN] image radar moirée
[Termes IGN] interferométrie différentielle
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] Japon
[Termes IGN] Kyushu (Japon)
[Termes IGN] réseau géodésique local
[Termes IGN] séismeRésumé : (auteur) SAR interferometry (InSAR) analysis of operational L-band SAR satellite of Japan, ALOS-2, reveals a series of coseismic crustal deformations caused by the 2016 Kumamoto Earthquake (April 14-16, 2016). Large coseismic deformation of over 10 centimeters due to the two large foreshocks and over 2 meters due to the mainshock can be clearly identified on the SAR interferograms as well as postseismic deformation up to a few centimeters. These displacements are concentrated around Futagawa-Hinagu fault zone which is a known active fault in Kyushu Island. 2.5-D displacements, more specifically quasi-east-west and quasi-vertical displacements due to the mainshock are also estimated from two interferograms observed from both east and west directions. The estimated displacements are consistent with those of ground GNSS observations. The sequence of the earthquakes causes significant distortion in the geodetic datum of Japan around the focal area, and thus positions of geodetic control points, which are fundamental infrastructure for implementing the datum needed to be revised as soon as possible. The area of the deformation could be promptly identified from the interferograms, and the control points which needed to be revised were quickly determined from the interferograms without any additional ground observation. Numéro de notice : A2016--076 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000150877.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84505
in Bulletin of the GeoSpatial Information authority of Japan > vol 64 (December 2016) . - pp 21 - 26[article]Geological structures control on earthquake ruptures: The Mw7.7, 2013, Balochistan earthquake, Pakistan / A. Vallage in Geophysical research letters, vol 43 n° 19 (15 October 2016)
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Titre : Geological structures control on earthquake ruptures: The Mw7.7, 2013, Balochistan earthquake, Pakistan Type de document : Article/Communication Auteurs : A. Vallage, Auteur ; Yann Klinger, Auteur ; R. Lacassin, Auteur ; Arthur Delorme, Auteur ; Marc Pierrot-Deseilligny , Auteur Année de publication : 2016 Article en page(s) : pp 10155 - 10163 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] Pakistan
[Termes IGN] séisme
[Termes IGN] structure géologique
[Termes IGN] subductionRésumé : (auteur) The 2013 Mw7.7 Balochistan earthquake, Pakistan, ruptured the Hoshab fault. Left‐lateral motion dominated the deformation pattern, although significant vertical motion is found along the southern part of the rupture. Correlation of high‐resolution (2.5 m) optical satellite images provided horizontal displacement along the entire rupture. In parallel, we mapped the ground rupture geometry at 1:500 scale. We show that the azimuth of the ground rupture distributes mainly between two directions, N216° and N259°. The direction N216° matches the direction of preexisting geologic structures resulting from penetrative deformation caused by the nearby Makran subduction. Hence, during a significant part of its rupture, the 2013 Balochistan rupture kept switching between a long‐term fault front and secondary branches, in which existence and direction are related to the compressional context. It shows unambiguous direct interactions between different preexisting geologic structures, regional stress, and dynamic‐rupture stress, which controlled earthquake propagation path. Numéro de notice : A2016--179 Affiliation des auteurs : LASTIG MATIS+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1002/2016GL070418 Date de publication en ligne : 09/10/2016 En ligne : https://doi.org/10.1002/2016GL070418 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91807
in Geophysical research letters > vol 43 n° 19 (15 October 2016) . - pp 10155 - 10163[article]Disaster debris estimation using high-resolution polarimetric stereo-SAR / Christian N. Koyama in ISPRS Journal of photogrammetry and remote sensing, vol 120 (october 2016)
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Titre : Disaster debris estimation using high-resolution polarimetric stereo-SAR Type de document : Article/Communication Auteurs : Christian N. Koyama, Auteur ; Hideomi Gokon, Auteur ; Masaru Jimbo, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 84 - 98 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] catastrophe naturelle
[Termes IGN] déchet
[Termes IGN] estimation statistique
[Termes IGN] hauteur (coordonnée)
[Termes IGN] image radar moirée
[Termes IGN] Japon
[Termes IGN] modèle stéréoscopique
[Termes IGN] séisme
[Termes IGN] volume (grandeur)Résumé : (Auteur) This paper addresses the problem of debris estimation which is one of the most important initial challenges in the wake of a disaster like the Great East Japan Earthquake and Tsunami. Reasonable estimates of the debris have to be made available to decision makers as quickly as possible. Current approaches to obtain this information are far from being optimal as they usually rely on manual interpretation of optical imagery. We have developed a novel approach for the estimation of tsunami debris pile heights and volumes for improved emergency response. The method is based on a stereo-synthetic aperture radar (stereo-SAR) approach for very high-resolution polarimetric SAR. An advanced gradient-based optical-flow estimation technique is applied for optimal image coregistration of the low-coherence non-interferometric data resulting from the illumination from opposite directions and in different polarizations. By applying model based decomposition of the coherency matrix, only the odd bounce scattering contributions are used to optimize echo time computation. The method exclusively considers the relative height differences from the top of the piles to their base to achieve a very fine resolution in height estimation. To define the base, a reference point on non-debris-covered ground surface is located adjacent to the debris pile targets by exploiting the polarimetric scattering information. The proposed technique is validated using in situ data of real tsunami debris taken on a temporary debris management site in the tsunami affected area near Sendai city, Japan. The estimated height error is smaller than 0.6 m RMSE. The good quality of derived pile heights allows for a voxel-based estimation of debris volumes with a RMSE of 1099 m3. Advantages of the proposed method are fast computation time, and robust height and volume estimation of debris piles without the need for pre-event data or auxiliary information like DEM, topographic maps or GCPs. Numéro de notice : A2016-796 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2016.08.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2016.08.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82530
in ISPRS Journal of photogrammetry and remote sensing > vol 120 (october 2016) . - pp 84 - 98[article]Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf / Denis Lombardi in Geophysical journal international, vol 206 n° 2 (August 2016)PermalinkA new computerized ionosphere tomography model using the mapping function and an application to the study of seismic-ionosphere disturbance / Jian Kong in Journal of geodesy, vol 90 n° 8 (August 2016)PermalinkSource model from ALOS-2 ScanSAR of the 2015 Nepal earthquakes / Youtian Liu in Journal of applied geodesy, vol 10 n° 2 (June 2016)PermalinkMonitoring recovery after earthquakes through the integration of remote sensing, GIS, and ground observations: the case of L’Aquila (Italy) / Diana Contreras in Cartography and Geographic Information Science, Vol 43 n° 2 (April - May 2016)PermalinkLe GPS dévoile les liens entre les grands séismes de subduction au Chili / Emilie Klein in XYZ, n° 146 (mars - mai 2016)PermalinkSynchrosqueezing S-transform and its application in seismic spectral decomposition / Zhong-lai Huang in IEEE Transactions on geoscience and remote sensing, vol 54 n° 2 (February 2016)PermalinkApport de la géodésie française fond de mer à l'évaluation de l'aléa sismique côtier : distancemétrie en mer de Marmara et simulation de GNSS/A aux Antilles / Pierre Sakic-Kieffer (2016)PermalinkDéveloppement d’applications Android en réalité augmentée pour atténuer les risques liés aux séismes / Hugo Baltz (2016)PermalinkEffectiveness of observation-domain sidereal filtering for GPS precise point positioning / Christopher Atkins in GPS solutions, vol 20 n° 1 (January 2016)PermalinkThe future of disaster response management / Krista Montgomery in GEO: Geoconnexion international, vol 15 n° 1 (January 2016)Permalink