Tilt signals at Mount Melbourne, Antarctica: evidence of a shallow volcanic source

• Published in: Polar Research
• Main Authors: Gambino, S., Aloisi, M., Falzone, G., Ferro, A.
• Other Authors: Gambino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia, Aloisi, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia, Falzone, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia, Ferro, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia, Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia
• Format: Article in Journal/Newspaper
• Language: English
• Published: Co-Action Publishing 2016
• Subjects: Tilt monitoring; volcanic dynamics; 10 physics volcanology; ground deformation; Victoria Land; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous; Mount Melbourne; Antarc*; Antarctica; permafrost; Polar Research
• Online Access: http://hdl.handle.net/2122/10498; https://doi.org/10.3402/polar.v35.28269

Mount Melbourne (74821? S, 164843? E) is a quiescent volcano located in 20 northern Victoria Land, Antarctica. Tilt signals have been recorded on Mount Melbourne since early 1989 by a permanent shallow borehole tiltmeter network comprising five stations. An overall picture of tilt, air and permafrost temperatures over 15 years of continuous recording data is reported. We focused our observations on long-term tilt trends that at the end of 1997 25 showed coherent changes at the three highest altitude stations, suggesting the presence of a ground deformation source whose effects are restricted to the summit area of Mount Melbourne. We inverted these data using a finite spherical body source, thereby obtaining a shallow deflation volume source located under the summit area. The ground deformation observed corroborates 30 the hypothesis that the volcanic edifice of Mount Melbourne is active and should be monitored multidisciplinarily. Published 28269 2V. Dinamiche di unrest e scenari pre-eruttivi JCR Journal open