Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/6286
Authors: | Aiuppa, A.* Cannata, A.* Cannavò, F.* Di Grazia, G.* Ferrari, F.* Giudice, G.* Gurrieri, S.* Liuzzo, M.* Mattia, M.* Montalto, P.* Patanè, D.* Puglisi, G.* |
Title: | Patterns in the recent 2007–2008 activity of Mount Etna volcano investigated by integrated geophysical and geochemical observations | Journal: | Geochemistry Geophysics Geosystems | Series/Report no.: | /11 (2010) | Publisher: | American Geophysical Union | Issue Date: | 2010 | DOI: | 10.1029/2010GC003168 | Keywords: | volcano monitoring Mt. Etna volcano geochemistry and geophysics volcanic tremor |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology 04. Solid Earth::04.08. Volcanology::04.08.01. Gases 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques |
Abstract: | Seismic, deformation, and volcanic gas observations offer independent and complementary information on the activity state and dynamics of quiescent and eruptive volcanoes and thus all contribute to volcanic risk assessment. In spite of their wide use, there have been only a few efforts to systematically integrate and compare the results of these different monitoring techniques. Here we combine seismic (volcanic tremor and long‐period seismicity), deformation (GPS), and geochemical (volcanic gas plume CO2/SO2 ratios) measurements in an attempt to interpret trends in the recent (2007–2008) activity of Etna volcano. We show that each eruptive episode occurring at the Southeast Crater (SEC) was preceded by a cyclic phase of increase‐decrease of plume CO2/SO2 ratios and by inflation of the volcano’s summit captured by the GPS network. These observations are interpreted as reflecting the persistent supply of CO2‐rich gas bubbles (and eventually more primitive magmas) to a shallow (depth of 1–2.8 km asl) magma storage zone below the volcano’s central craters (CCs). Overpressuring of the resident magma stored in the upper CCs’ conduit triggers further magma ascent and finally eruption at SEC, a process which we capture as an abrupt increase in tremor amplitude, an upward (>2800 m asl) and eastward migration of the source location of seismic tremor, and a rapid contraction of the volcano’s summit. Resumption of volcanic activity at SEC was also systematically anticipated by declining plume CO2/SO2 ratios, consistent with magma degassing being diverted from the central conduit area (toward SEC). | Description: | An edited version of this paper was published by AGU. Copyright (2010) American Geophysical Union |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
Aiuppa et al., 2010 GC.pdf | 2.66 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
20
61
checked on Feb 10, 2021
Page view(s) 50
255
checked on Apr 20, 2024
Download(s)
45
checked on Apr 20, 2024