Long-Term Stability of the SIRGAS Reference Frame and Episodic Station Movements Caused by the Seismic Activity in the S
The western part of the SIRGAS region is an extremely active seismic area because it is located in the plate boundary zone of six tectonic plates, namely the Pacific, Cocos, Nazca, North American, Caribbean, and South American plates. The frequent occurre
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L. Sa´nchez, W. Seemu¨ller, H. Drewes, L. Mateo, G. Gonza´lez, A. da Silva, J. Pampillo´n, W. Martı´nez, V. Cioce, D. Cisneros, and S. Cimbaro
Abstract
The western part of the SIRGAS region is an extremely active seismic area because it is located in the plate boundary zone of six tectonic plates, namely the Pacific, Cocos, Nazca, North American, Caribbean, and South American plates. The frequent occurrence of earthquakes causes episodic station movements, which affect the long-term stability of the SIRGAS reference frame. Normally, these episodic events are taken into account in the frame realisation by introducing new position and, optionally, velocity parameters for the affected stations. However, this is not enough to guarantee the high precision required in a reference frame such as SIRGAS. Additional analyses about the post-seismic behaviour of the reference stations are necessary to allow the precise transformation between preseismic and post-seismic (deformed) frames. According to this, the paper presents an evaluation of the long-term stability of the SIRGAS reference frame including the comparison of the different SIRGAS realisations and the analysis of station displacements caused by earthquakes in the SIRGAS region. Special care is given to the events happened in
L. Sa´nchez (*) W. Seemu¨ller H. Drewes Deutsches Geoda¨tisches Forschungsinstitut (DGFI), Mu¨nchen, Germany e-mail: [email protected] L. Mateo Instituto Argentino de Nivologı´a, Glaciologı´a y Ciencias Ambientales – CONICET, Mendoza, Argentina G. Gonza´lez Instituto Nacional de Estadı´stica y Geografı´a (INEGI), Aguascalientes, Mexico A. da Silva Instituto Brasileiro de Geografia e Estatistica (IBGE), Rio de Janeiro, Brazil J. Pampillo´n Servicio Geogra´fico Militar (SGM), Montevideo, Uruguay W. Martı´nez Instituto Geogra´fico Agustı´n Codazzi (IGAC), Bogota, Colombia V. Cioce Laboratorio de Geodesia Fı´sica y Satelital, Universidad del Zulia, Maracaibo, Venezuela D. Cisneros Instituto Geogra´fico Militar (IGM), Quito, Ecuador S. Cimbaro Instituto Geogra´fico Nacional (IGN), Buenos Aires, Argentina Z. Altamimi and X. Collilieux (eds.), Reference Frames for Applications in Geosciences, International Association of Geodesy Symposia 138, DOI 10.1007/978-3-642-32998-2_24, # Springer-Verlag Berlin Heidelberg 2013
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Arequipa (on 2001-06-23, M ¼ 8.4) and Chile (on 2010-02-27, M ¼ 8.8). The analysis is based on the SIRGAS Continuously Operating Network (SIRGAS-CON). Beside analysing the station position time series and estimating the displacement vectors of the SIRGAS reference stations, some recommendations to mitigate the impact of this kind of events in the use of SIRGAS as a reference frame are formulated. Keywords
SIRGAS reference frame Reference frame deformation realisation Arequipa earthquake Chile earthquake
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Introduction
Terrestrial reference frames supporting precise positioning based on global navigation satellite systems (GNSS) must be consistent with the reference frame in which the
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