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Instituto de Investigação
em Vulcanologia e Avaliação de Riscos
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Referência Bibliográfica

TROTA, A., RODRIGUES, R., AMARAL, P., GASPAR, J.L., MENDES, V. (2004) - GPS continuous observations at S. Miguel and Terceira islands (Azores): preliminary results. International Symposium “REDUCING VOLCANIC RISK IN ISLANDS”, Tenerife, Canary Islands, Spain, 2 - 6 de Junho (Comunicação Oral).


The Azores archipelago is placed near the triple junction formed by the African, American and Eurasian plates and is characterized by a moderate seismic and volcanic activity. In the scope of the multi-parametric volcano monitoring programme that is being developed in the Azores region by the Centro de Vulcanologia e Avaliação de Riscos Geológicos (CVARG) the installation of a Continuous GPS (CGPS) network was started in 2002. Until now four stations were established: two on S. Miguel island (RIB1 and QBN1) and two on Terceira island (SRPC and NOV1). In addition to these stations, the Instituto Geográfico Português (IGP) operates an EUREF CGPS station (Ponta Delgada – PDEL) since 2000, which was included on the network as a reference station. Despite some gaps on data acquisition, the longer time series available make possible the estimation of velocities for the Azores CGPS network (ACGPSN). The observed results, complemented with discrete data obtained on yearly campaigns carried out on several volcanic systems, will improve our knowledge on the deformation patterns that occur in the Azores active volcanic systems. Such information will be part on a vast multidisciplinary evaluation system in order to foreseen volcanic unrest. Improvements on ACGPSN are expected with the installation of 3 more additional CGPS stations until the beginning of 2005: two stations in S. Miguel Island under the INTERREG IIIB UE Alerta Project and one at Faial Island in the scope of the DISPLAZOR FCT project.