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Proceedings of the Workshop New challenges for geodesy in volcanoes monitoring / J. Barthelemy (1995)
Titre : Proceedings of the Workshop New challenges for geodesy in volcanoes monitoring Type de document : Actes de congrès Auteurs : J. Barthelemy, Éditeur scientifique ; B. Ducarme, Éditeur scientifique ; Paul Melchior, Éditeur scientifique Editeur : Luxembourg : Conseil de l'Europe Année de publication : 1995 Collection : Cahiers du Centre Européen de Géodynamique et de Séismologie num. 8 Conférence : ECGS 1993, Workshop New challenges for geodesy in volcanoes monitoring 14/09/1993 16/06/1993 Walferdange Grand Duché du Luxembourg Importance : 348 p. Format : 16 x 23 cm ISBN/ISSN/EAN : 978-2-87977-031-4 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] déformation de la croute terrestre
[Termes IGN] Etna (volcan)
[Termes IGN] nivellement
[Termes IGN] positionnement par GPS
[Termes IGN] risque naturel
[Termes IGN] surveillance géologique
[Termes IGN] volcanNuméro de notice : 54106 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=35623 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 54106-01 CG.93 Livre Centre de documentation Congrès Disponible Present-day deformation of the French northwestern Alps/southern Jura mountains: comparison between historical triangulations / F. Jouanne in Geophysical journal international, vol 119 n° 1 (October 1994)
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Titre : Present-day deformation of the French northwestern Alps/southern Jura mountains: comparison between historical triangulations Type de document : Article/Communication Auteurs : F. Jouanne, Auteur ; G. Menard, Auteur ; Dominique Jault, Auteur Année de publication : 1994 Article en page(s) : pp 151 - 165 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] Alpes (France)
[Termes IGN] déformation de la croute terrestre
[Termes IGN] Jura, massif du
[Termes IGN] point géodésique
[Termes IGN] triangulationRésumé : (auteur) The change of the coordinates of 44 geodetic points between two surveys, epochs 1930–36 and 1979–84 are studied. The discussion is supported by strain rate tensors and angular shear rates for different sets of three adjacent points as well as by calculated displacements together with their confidence ellipses. The southern Jura mountains may undergo a relatively homogenous pattern of deformation characterized by a roughly east—west to NE—SW compression and by a significant westward motion (5 mm yr−1) relative to the frontal Jura mountains. This deformation would be compatible with the few focal mechanisms of earthquakes available for this area. A displacement of nearly 2 cm yr−1 affected a geodetic point north of Annecy. Unfortunately, this point is the only one that shows such a movement, we cannot exclude a local displacement of this benchmark. Numéro de notice : A1994-039 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1365-246X.1994.tb00919.x Date de publication en ligne : 01/10/1994 En ligne : https://doi.org/10.1111/j.1365-246X.1994.tb00919.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102893
in Geophysical journal international > vol 119 n° 1 (October 1994) . - pp 151 - 165[article]Detection of creep along the Philippine Fault: First results of geodetic measurements on Leyte Island, central Philippine / Thierry Duquesnoy in Geophysical research letters, vol 21 n° 11 ([01/06/1994])
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Titre : Detection of creep along the Philippine Fault: First results of geodetic measurements on Leyte Island, central Philippine Type de document : Article/Communication Auteurs : Thierry Duquesnoy , Auteur ; E. Barrier, Auteur ; Michel Kasser
, Auteur ; M. Aurelio, Auteur ; R. Gaulon, Auteur ; R.S. Punongbayan, Auteur ; Claude Rangin, Auteur
Année de publication : 1994 Article en page(s) : pp 975 - 978 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] données géodésiques
[Termes IGN] modèle de déformation tectonique
[Termes IGN] Philippines
[Termes IGN] tectonique des plaquesRésumé : (auteur) Geodetic trilateration/GPS measurements were acquired from experiments conducted in 1991 and 1993 in the central part of the Philippine Fault on Leyte island. Displacement vectors deduced from two least squares adjustments indicate a mean slip rate of 26±10 mm/yr at an azimuth of about N130°E. These values are consistent with the tectonic and kinematic data. Our results indicate that the displacements are: (1) almost parallel to the Philippine Fault, and (2) related to creep along the fault, because no moderate seismic events occurred between the two observation epochs. Numéro de notice : A1994-040 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/94GL00640 Date de publication en ligne : 01/06/1994 En ligne : https://doi.org/10.1029/94GL00640 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102935
in Geophysical research letters > vol 21 n° 11 [01/06/1994] . - pp 975 - 978[article]
Titre : Formes et mouvements de la Terre : satellites et géodésie Type de document : Monographie Auteurs : Anny Cazenave, Auteur ; K. Feigl, Auteur Editeur : Paris, Toulouse, ... : Centre national de la recherche scientifique CNRS Année de publication : 1994 Autre Editeur : Paris : Belin Collection : Croisée des sciences, ISSN 1250-6028 Importance : 159 p. Format : 19 x 24 cm ISBN/ISSN/EAN : 978-2-271-05233-9 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] géoïde
[Termes IGN] marée océanique
[Termes IGN] marée terrestre
[Termes IGN] rotation de la Terre
[Termes IGN] tectonique des plaques
[Termes IGN] Vénus (planète)Index. décimale : 30.00 Géodésie - généralités Numéro de notice : 62760 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61128 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 62760-01 30.00 Livre Centre de documentation Géodésie Disponible 62760-02 DEP-ELG Livre Marne-la-Vallée Dépôt en unité Exclu du prêt 62760-03 DEP-ELG Livre Marne-la-Vallée Dépôt en unité Exclu du prêt Geodätischer Nachweis rezenter horizontaler Krustenbewegungen auf dem Gebiet der ehemaligen DDR . eine kritische Analyse / R. Wittenburg (1994)
Titre : Geodätischer Nachweis rezenter horizontaler Krustenbewegungen auf dem Gebiet der ehemaligen DDR . eine kritische Analyse Titre original : [La preuve géodésique des récents mouvements horizontaux de la croûte terrestre sur le territoire de l'ancienne Allemagne de l'est : une analyse critique] Type de document : Thèse/HDR Auteurs : R. Wittenburg, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1994 Collection : DGK - C Sous-collection : Dissertationen num. 432 Importance : 159 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9475-8 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Allemagne
[Termes IGN] analyse comparative
[Termes IGN] déformation de la croute terrestre
[Termes IGN] erreur systématique
[Termes IGN] modèle de Gauss-Markov
[Termes IGN] réseau géodésique local
[Termes IGN] résiduIndex. décimale : 30.82 Applications géophysiques de géodésie spatiale Résumé : (Auteur) Among the special developments in geodesy in former East Germany, there was a countrywide triangulation carried out around 1960. A completely new network configuration was created in contrast to earlier triangulations. In spite of this, a connection can be established via a considerable number of identical points. This allows congruency analysis (coordinate comparison) of these networks created with a relatively large distance of epochs.
Therefore, there are good conditions in eastern Germany for the investigation of recent horizontal crustal movements.
While no global network comparison (for the entire territory of former East Germany) has been carried out so far, such comparative analysis has been done for local triangulation networks in several areas. Chapter 1 contains an overview of these investigations.
The above studies provided valuable preliminary information for continued research using modern me--thods of investigation. It is thought to be possible to conduct these continued investigations more efficiently using a suitable design of experiments.
The methods used for network comparison are analyzed in detail in Chapter 2.
All above network comparisons are based on calculations done by the former Kombinat Geodasie und Kartographie, Leipzig. In former East Germany, this was the only firm entitled to do such calculations. Clients and subsequent users did not have access to the calculation documents, and only limited access to the original data. Due to this protected and uncontrollable operation of Jthe firm, further evaluation had to be done bona fide assuming the correctness of the provided calculation results. It will be shown that this bona fide approach is not necessarily scientific.
The necessity of a review was recognized from the contradictions described in Chapter 3. Highly sig--nificant contradictions in the overlapping area of neighbouring network comparisons (= external model residuals) were observed even after the elimination of contradictions due to the calculation method used (fixed point method) (= internal model residuals = SYS 1).
Since the access to the calculation documents of the geodetic firm was denied, an analysis method based on measurements was developed and realized in the program "Test Net Siidharz" (see Chapter 4). The first result revealed was a fundamental methodological error:
The observations of the epoch "1900" were included in the adjustment (in the gauss-kruger plane) without directional reduction, whereas the observations of the epoch "1960" were reduced to the corresponding reference meridian.
In the gauss-markov (GM) model used, this error led to systematic distortions (= SYS 2) of the solutions which were mathematically modelled in an extension of the GM model. This made possible the correction (coordinate correction) of the erroneous solutions without having access to the measurement data. Chapter 5 describes the successful verification of this correction method.
After the elimination of SYS 2, a further systematic pattern (= SYS 3) was observed in several network comparisons (Chapter 6). This also was shown to be a conformal stretch.
First, a clarification of SYS 3 via the inyariance properties of Gauss' formula with respect to daU transformations was tried by inverse calculation from locally determined scale differences. This produ--ced the assumption of a twofold directional reduction of the observations of the second measuremen epoch; however, this hypothesis could not be confirmed.
An extended "tensorial" analysis of SYS 3 (see Chapter 6) produced results indicating a dependence on
schreiber's reference meridian (Berlin-Rauenberg, 13.4°). The corresponding correlation of SYS '
to the Royal Prussian Triangulation was confirmed by investigations in the test network "Sudharz".
Due to an additional model extension (extended coordinate correction), the final results were in agreement
with the results of the "Sudharz" test network.
The revealed errors required a general reexamination of the previous studies on the epoch comparison
"1900-1960". The newly developed correction models allowed to do this in spite of the access to thi
original calculation documents being denied. The following general assessment was obtained:
All "horizontal translation vectors" calculated by the former Kombinat Geodasie und Kartographie
contain several types of errors.
In addition to several gross errors of individual data, the following systematic errors have to be distinguished:
1. Systematic errors due to the calculation method used (fixed point method) (SYS 1)
2. Systematic errors due to the missing directional reduction of the first measurement epoch (SYS 2)
3. Systematic errors indicating a correlation between the observations of the first measurement epoch and schreiber's reference meridian (SYS 3)
As a result of reexamination, SYS 1 and SYS 2 were found in all network comparisons. The networl comparisons "Sachsen" (thurm et al. 1977) are distorted by both SYS 1 and SYS 2; therefore, they have t be completely corrected with respect to their qualitative result. SYS 3 was observed only in the network comparisons Siidharz-E, Zielitz, Altmark-E, and Altmark-W.
Modern test programs, in particular those for geodimeter networks, usually confirm the differences betweei the epochs "1900" and "1960". The reason for the differences, however, is usually localized in "1900" wher the point position determination was characterized by the relatively highest entropy of measurement am the poorest reliability. This reflection of technological progress further substantiates the presented assessment of the epoch comparison "1900 - 1960". The basic objective of the described investigation, i.e the study of recent horizontal crustal movements in areas with relatively little tectonic activity, remains a major challenge to geodesy.Numéro de notice : 28058 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63405 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28058-01 30.82 Livre Centre de documentation Géodésie Disponible 28058-02 30.82 Livre Centre de documentation Géodésie Disponible PermalinkPermalinkProceedings of the eighth international symposium on recent crustal movements (CRCM'93) / R. Shichi (1994)
PermalinkPermalinkPermalinkThe IERS Terrestrial Reference Frame (ITRF 93): consistency with the IERS Earth orientation parameters / Zuheir Altamimi (1994)
PermalinkPermalinkFirst epoch geodetic GPS measurements across the Afar Plate Boundary Zone / Jean-Claude Ruegg in Geophysical research letters, vol 20 n° 18 (Septembre 1993)
PermalinkCompte rendu de Congrès, International Workshop for Reference Frame establishment and Technical development in Space Geodesy, IRIS '93 [International Radio Interferometric Surveying], Communications Research Laboratory / Zuheir Altamimi (1993)
PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkThe Worldwide centimetric terrestrial reference frame and its associated velocity field / Zuheir Altamimi (01/09/1992)
PermalinkPermalinkPermalinkPermalinkAnalyse du positionnement terrestre par le système Doris et évaluation de ses performances / Jean-Jacques Valette (1992)
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