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A general formula for calculating meridian arc length and its application to coordinate conversion in the Gauss-Krüger projection / K. Kawase in Bulletin of the GeoSpatial Information authority of Japan, vol 59 (December 2011)  

Public [article]  inBulletin of the GeoSpatial Information authority of Japan > vol 59 (December 2011) . - pp 1 - 13 Titre : A general formula for calculating meridian arc length and its application to coordinate conversion in the Gauss-Krüger projection Type de document : Article/Communication Auteurs : K. Kawase, Auteur Année de publication : 2011 Article en page(s) : pp 1 - 13 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] arc de méridien [Termes IGN] Japon [Termes IGN] projection Universal Transverse Mercator [Termes IGN] système de coordonnées [Termes IGN] transformation de coordonnées Résumé : (Auteur) The meridian arc length from the equator to arbitrary latitude is of utmost importance in map projection, particularly in the Gauss-Krüger projection. In Japan, the previously used formula for the meridian arc length was a power series with respect to the first eccentricity squared of the earth ellipsoid, despite the fact that a more concise expansion using the third flattening of the earth ellipsoid has been derived. One of the reasons that this more concise formula has rarely been recognized in Japan is that its derivation is difficult to understand. This paper shows an explicit derivation of a general formula in the form of a power series with respect to the third flattening of the earth ellipsoid. Since the derived formula is suitable for implementation as a computer program, it has been applied to the calculation of coordinate conversion in the Gauss-Krüger projection for trial. Numéro de notice : A2011-550 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000062452.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31444 [article]

The crustal deformation and fault model of the 2011 off the Pacific coast of Tohoku earthquake / T. Imakiire in Bulletin of the GeoSpatial Information authority of Japan, vol 59 (December 2011)  

Public [article]  inBulletin of the GeoSpatial Information authority of Japan > vol 59 (December 2011) . - pp 21 - 30 Titre : The crustal deformation and fault model of the 2011 off the Pacific coast of Tohoku earthquake Type de document : Article/Communication Auteurs : T. Imakiire, Auteur ; T. Kobayashi, Auteur Année de publication : 2011 Article en page(s) : pp 21 - 30 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] déformation de la croute terrestre [Termes IGN] faille géologique [Termes IGN] Geonetwork [Termes IGN] image ALOS-PALSAR [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] séisme [Termes IGN] Tohoku (Japon) Résumé : (Auteur) This paper presents an overview of crustal deformation caused by the 2011 off the Pacific coast of Tohoku Earthquake, detected by GEONET (GPS Earth Observation Network), the GPS continuous observation system operated by the GSI, and by interferometric SAR (InSAR) analysis using ALOS/PALSAR data. We found that a very wide area of the Japanese Islands, from Hokakido to the Kinki district, was remarkably affected by the crustal deformation caused by the mainshock of the Tohoku Earthquake. We estimated the geometry of the seismogenic fault of the earthquake, as well as the slip model for the plate boundary between the Pacific plate and the North American plate, from the crustal deformation data obtained from GEONET. The fault is estimated to be longer than 400 km, stretching from off Iwate Prefecture in the north to off Ibaraki Prefecture in the south. The largest slip estimate for the plate boundary is more than 56 m in the off-Miyagi region near the Japan Trench. Postseismic crustal deformation is also observed by GEONET, indicating that slow postseismic slip is ongoing along the plate boundary around the main fault zone. Additionally, we detected clear coseismic signals associated with induced inland earthquakes in the Fukushima-Hamadori area from InSAR analysis. The InSAR results show obvious displacement discontinuities, suggesting that rather shallow ruptures occurred. In particular, for the Mj 7.0 event on April 11, the observed displacement boundaries correspond to earthquake surface ruptures that appeared just along the Idosawa and Yunotake faults. Numéro de notice : A2011-551 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000065834.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31445 [article]

Revision of survey results of control points after the 2011 off the Pacific coast of Tohoku earthquake / Y. Hiyama in Bulletin of the GeoSpatial Information authority of Japan, vol 59 (December 2011)  

Public [article]  inBulletin of the GeoSpatial Information authority of Japan > vol 59 (December 2011) . - pp 31 - 42 Titre : Revision of survey results of control points after the 2011 off the Pacific coast of Tohoku earthquake Type de document : Article/Communication Auteurs : Y. Hiyama, Auteur ; T. Kawahara, Auteur ; M. Iwata, Auteur Année de publication : 2011 Article en page(s) : pp 31 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] erreur de positionnement [Termes IGN] GeoNet [Termes IGN] Japon [Termes IGN] point d'appui [Termes IGN] positionnement par GPS [Termes IGN] révision des données [Termes IGN] séisme [Termes IGN] station GPS Résumé : (Auteur) Large-scale crustal deformation over a wide area of eastern Japan was detected by GEONET, Japan's dense Global Positioning System (GPS) network, following the 2011 off the Pacific coast of Tohoku Earthquake occurred on March 11, 2011. Since it was assumed that coordinates of the control points for public surveys, such as GEONET stations, triangulation stations and leveling bench marks, in a wide area were greatly changed and could hardly maintain consistency between nearby stations, the Geospatial Information Authority of Japan (GSI) stopped providing ‘Survey Results’ of them, which were the coordinates for survey use, and announced it publicly on March 14, 2011. In order to promote various public restoration programs in the affected area, it was strongly required to revise the Survey Results in an urgent manner. On the other hand, because large postseismic deformation had continued widely after the event, it was concerned that even if the Survey Results were updated immediately, they would become ineffective in a short time. Therefore GSI examined the optimal timing to calculate their new coordinates by predicting the amount of future postseismic movement based on the observation data of GEONET stations. Eventually, the new Survey Results of GEONET stations were published on May 31, 2011 and those of triangulation stations and leveling bench marks on October 31, 2011 respectively. In this paper, we report the revision process of the Survey Results after the 2011 Tohoku Earthquake. Numéro de notice : A2011-552 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000065835.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31446 [article]