Abstract
Several techniques are being used on Mount Etna, to record ground movements. A network of automatic tiltmeters has been installed to record rapid ground movements associated both with the sudden changes in volcanic activity (that may occur over a time period of a few days) and the long-term deformation component. Tilt changes that occur over long time periods are recorded by repeated relevelling of short lines, using a standard levelling technique. Short aperture levelling lines have also been sited near some tiltmeters, so that we will be able to record both short-term and long-term changes in ground movements at several locations on Etna. Such information also allows us to validate the data recorded by automatic tiltmeters. Horizontal strain is recorded by making repeated trilateration surveys, using the global positioning system (GPS) to measure ground movements on Etna while electronic distance measurements (EDM) are performed whenever it was possible to compare the precision of the GPS and EDM techniques. Our first comparison shows that these two methods agree at about the 2 ppm level.
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© 1992 Springer-Verlag Berlin Heidelberg
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Briole, P., Gaulon, R., Nunnari, G., Puglisi, G., Ruegg, J.C. (1992). Measurements of Ground Movement on Mount Etna, Sicily: A Systematic Plan to Record Different Temporal and Spatial Components of Ground Movement Associated with Active Volcanism. In: Gasparini, P., Scarpa, R., Aki, K. (eds) Volcanic Seismology. IAVCEI Proceedings in Volcanology, vol 3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77008-1_10
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DOI: https://doi.org/10.1007/978-3-642-77008-1_10
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