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Geodetic Methods for Monitoring Crustal Motion and Deformation

  • Athanasios DermanisEmail author
Living reference work entry
Part of the Springer Reference Naturwissenschaften book series (SRN)

Zusammenfassung

Die Verwendung geodätischer Daten für Studien der Krustendeformation führt zu zwei möglichen Fällen: (a) dem Vergleich der Ausprägung zweier Epochen, für die Stationskoordinaten verfügbar sind, um in jeder gewünschten Genauigkeit invariante planare Deformationsparameter zu berechnen, (b) der Nutzanwendung von Koordinaten und Geschwindigkeiten, um während einer bestimmten Epoche Zeitableitungen der Deformationsparameter zu bestimmen. Der vorliegende Beitrag widmet sich der klassischen approximativen ,,infinitesimalen“ Theorie ebenso wie der weit verbreiteten Finite-Element-Methode mittels triangulärer Elemente zur Interpolation von Stationsverschiebungen und Geschwindigkeiten. Eine strenge Theorie der Erweiterung planarer Deformation auf den dreidimensionalen Fall wird aufgewiesen.

Keywords

Crustal motion Crustal deformation Principal strains Strain Strain rate Dilatation Shear Strain invariance Surface deformation Horizontal deformation 

Abstract

The use of geodetic data for crustal deformation studies is studied for the two possible cases: (a) The comparison of shape at two epochs for which station coordinates are available in order to compute, at any desired point, invariant planar deformation parameters (strain parameters), such as principal strains, principal elongations, dilatation and shear. (b) The utilization of coordinates and velocities at a particular epoch for the computation of the time derivatives of the deformation parameters (strain rate parameters). The classical approximate “infinitesimal” theory is presented as well as the widely used finite element method with triangular elements for the interpolation of station displacements and velocities. In addition, a new completely rigorous planar deformation theory, based on the singular value decomposition of the deformation gradient matrix, is presented for both strain and strain rate parameter computation. The invariance characteristics of all the above deformation parameters, under changes of the involved reference systems, are studied, from a purely geodetic point of view different from that in classical mechanics. Emphasis is given to the separation of rigid motion of independent tectonic regions from their internal deformation, utilizing the concept of a discrete Tisserand reference system that best fits the geodetic subnetwork covering the relevant region. Interpolation of displacements or velocities using stochastic minimum mean square error prediction (known as collocation or kriging) is also examined with emphasis on how it can become statistically relevant and rigorous based on sample covariance and cross-covariance functions. It is also shown how the planar deformation can be adapted to the study of surface deformation, with applications to the study of shell-like constructions in geodetic engineering and the deformation of the physical surface of the earth. The most important application presented, is the study of horizontal deformation on the surface of the reference ellipsoid, utilizing either differences of geodetic coordinates between two epochs, or the horizontal components of station velocities. Finally, it is also shown how the rigorous theory of planar deformation can be extended to the three-dimensional case.

Notes

Acknowledgements

This presentation uses largely material from an unpublished invited presentation [5]. Most of its conclusions here are based on practical experience gained with software developed by Professor Ludovico Biagi of the Politecnico di Milano, which cover all methods of deformation analysis. I am thankful to Professor Biagi for his contribution to this research and his overall support.

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Copyright information

© Springer-Verlag GmbH Deutschland, ein Teil von Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Geodesy and Surveying (DGS)Aristotle University of ThessalonikiThessalonikiGreece

Section editors and affiliations

  • Willi Freeden
    • 1
  1. 1.Geomathematics GroupUniversity of KaiserslauternKaiserslauternGermany

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