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High precision tilt observation at Mt. Etna Volcano, Italy

Ferro A., Gambino S., Panepinto S., Falzone G., Laudani G., Ducarme B.

Acta Geophysica

2011

Vol. 59, no. 3

618-632

In 2007-2008, we installed on Mt. Etna two deep tilt stations using high resolution, self-leveling instruments. These installations are a result of accurate instrument tests, site selection, drilling and sensor positioning that has allowed detecting variations related to the principal diurnal and semidiurnal tides for first time on Mt. Etna using tilt data. We analyzed the tidal effects recorded on tilt signals and we removed tidal effects from signals, thereby allowing to detect changes of about 20 nrad with a considerable improvement in respect to the previous installation. Tilt changes have accompanied the Mt. Etna main eruptive phases and are generally related to the rapid rise of magma and formation of dikes and eruptive fissures. However, tilt changes may characterize lava fountains, earthquakes, and inflation-deflation phases. The 2008-2009 eruption represents an example of the potential of the tiltmeters we used, which provides new perspectives for highly precise monitoring of ground deformation on volcanoes.

Radon in outdoor air in the Mt. Etna area, Italy

Vaupotič J., Žvab P., Giammanco S.

Nukleonika

2010

Vol. 55, No. 4

573-577

Radon (222Rn) activity concentration in outdoor air was measured, using AlphaGuard radon monitors, at 25 points in the Mt. Etna area, at different distances and in different directions from the summit. Values of up to 93 Bqźm–3 were found at three points close to the summit, at altitudes of about 3000 m above the sea level, and in the range of 3.0–19.6 Bqźm–3 elsewhere. An average radon concentration of 7.9 Bqźm–3 was obtained in the northern region, 4.8 Bqźm–3 in the eastern (oriented towards the sea), 9.6 Bqźm–3 in the western (the furthest inland), and 6.5 Bqźm–3 in the southern.