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


Referência Bibliográfica

TROTA, A., RODRIGUES, R., AMARAL, P. (2004) - Azores University Volcano Observatory: Geodetic Monitoring Group. International Symposium “REDUCING VOLCANIC RISK IN ISLANDS”, Tenerife, Canary Islands, Spain, 2 - 6 de Junho (Poster).


Applied geodesy is becoming one of the most important disciplines to measure deformation on Earth either on local or global scale, with special emphasis on geodynamics and volcano monitoring. Azores region, placed on the triple junction where American, African and Euroasiatic plates meet and with several historic volcano eruptions and continuous seismicity, is an ideal zone for those tasks. Due to low to very low deformation rates, sloppy topography and dense vegetation special attention was taken concerning network implementation, election of the geodetic techniques and data acquisition methodology.


This work reports the geodetic monitoring programme of the Geodetic Monitoring Group (GMG) of CVARG (Azores University) currently in progress, aiming for the monitoring of active volcanic zones of Azores region. Crustal deformation studies on Azores region can be split on three different scales: (a) deformation on the scale of the island/group of islands (tens to hundreds of Km); (b) deformation on the volcano system scale (few to tens of km); (c) deformation on local scale (tens of meters up two one km). At the moment, for scales (a) and (b) the GMG is using GPS technique, set up on dense networks. For the local scale, aiming for the detection of local deformation patterns (e.g. faults and landslides), GPS and EDM/Total Station are the elected equipments. Data acquisition is made based on three different approaches: (1) continuous data acquisition (e.g. Azores continuous GPS network, ACGPSN); (2) regular discrete data acquisition (e.g. annual GPS campaigns); (3) special campaigns aiming for the rapid evaluation of deformation under volcanic unrest or slope instability crises.


All the information under acquisition makes possible the understanding of the deformation pattern on Azores region thus contributing for the knowledge of local and regional tectonics and for volcanic prediction.