TY - GEN
T1 - Long-Term Stability of the SIRGAS Reference Frame and Episodic Station Movements Caused by the Seismic Activity in the SIRGAS Region
AU - Sánchez, L.
AU - Seemüller, W.
AU - Drewes, H.
AU - Mateo, L.
AU - González, G.
AU - da Silva, A.
AU - Pampilló, J.
AU - Martínez, W.
AU - Cioce, V.
AU - Cisneros, D.
AU - Cimbaro, S.
PY - 2013
Y1 - 2013
N2 - 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 Arequipa (on 2001-06-23, M 1/4 8.4) and Chile (on 2010-02-27, M 1/4 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.
AB - 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 Arequipa (on 2001-06-23, M 1/4 8.4) and Chile (on 2010-02-27, M 1/4 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.
KW - Arequipa earthquake
KW - Chile earthquake
KW - Pre- and post-seismic frame realisation
KW - Reference frame deformation
KW - SIRGAS reference frame
UR - http://www.scopus.com/inward/record.url?scp=84884346242&partnerID=8YFLogxK
U2 - 10.1007/978-3-642-32998-2_24
DO - 10.1007/978-3-642-32998-2_24
M3 - Conference contribution
AN - SCOPUS:84884346242
SN - 9783642329975
T3 - International Association of Geodesy Symposia
SP - 153
EP - 161
BT - Reference Frames for Applications in Geosciences - Proccedings of the Symposium
T2 - IAG Symposium on Reference Frames for Applications in Geosciences, REFAG 2010
Y2 - 4 October 2010 through 8 October 2010
ER -