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Instituto de Investigação
em Vulcanologia e Avaliação de Riscos
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Painéis ► em encontros internacionais


Referência Bibliográfica

RODRIGUES, R., MENDES, V.B., TROTA, A., GASPAR, J.L., AMARAL, P. (2005) - Aplicação da Técnica GPS no estudo da deformação dos sistemas vulcano-tectónicos da ilha Graciosa  (Açores). 4º Simpósio de Meteorologia e Geofísica, Sesimbra, 14 - 17 de Fevereiro (Poster).


In the scope of the Azores seismovolcanic monitoring programme a geodetic network was implemented in Graciosa Island.


The network is composed by thirty-five geodetic benchmarks distributed according to the main volcanic and tectonic structures. A continuous GPS station installed in the island since 2003 is used as reference. In the last two years three observation campaigns took place in Graciosa Island, homely in September 2003, March 2004 and August 2004. For the processing of the GPS observations, the Bernese GPS Software 4.2, developed at the University of Berne, was used. For the GPS processing of September 2003, March 2004 and August 2004 campaigns, three processing strategies to study the effect of the correction of troposphere refraction were tested, resulting in three different solutions: one solution with pure modeling (no estimation of troposphere parameters), and two solutions with estimation of one and two troposphere parameters, using Niell’s hydrostatic mapping function. A processing methodology was created, a good and reliable zero-epoch for the study of the volcanic-tectonic system of the Graciosa Island was established and a preliminary evaluation of the velocity field within Graciosa Island was obtained.