Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/6354
Authors: | Greco, F.* Currenti, G.* Del Negro, C.* Napoli, R.* Budetta, G.* Fedi, M.* Boschi, E.* |
Title: | Spatiotemporal gravity variations to look deep into the southern flank of Etna volcano | Journal: | Journal Geophysical Research | Series/Report no.: | /115 (2010) | Issue Date: | 19-Nov-2010 | DOI: | 10.1029/2009JB006835 | Keywords: | Microgravity, Volcano monitoring, Etna volcano, density changes | Subject Classification: | 04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods | Abstract: | A 14-year-long microgravity data set (October 1994 - September 2007) collected along a 24-kilometer East-West trending profile of 19 stations was analyzed to detect underground mass redistributions related to the volcanic activity involving the southern flank of Mt Etna (Italy). A multiresolution wavelet analysis was applied to separate the volcano-related anomalies from the unwanted components. The residual image having both spatial extension and temporal duration evidenced two complete gravity increase/decrease cycles mainly affecting the central and eastern stations of the profile. The first gravity increase (early 1995 to the end of 1996) and decrease (end of 1996 to late in 1998) cycle reached a maximum amplitude of approximately 90 µGal. The second gravity increase (mid-1999 to mid-2000) – decrease (mid-2000 to early-2004) cycle attained an amplitude of about 80 µGal. After about five years of a persistent negative gravity anomaly, a new semi-cycle started at the end of 2006 and continued during the last survey carried out in September 2007. The density changes, modeled over time since 1994 using a Quadratic Programming algorithm, are mainly located at a depth of 2-4 km bsl in a region recognized to be a preferential pathway of magma rising and an intermediate zone of magma storage/withdrawal. The computed positive mass variations of about 105 x 10^9 kg were interpreted as magma accumulation, while negative mass changes of about -120 x 10^9 kg were associated with either magma drainage or opening of new voids by tectonic stresses within a source volume, where tensional earthquakes occurred. | 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 |
---|---|---|---|---|
Greco et al JGR 2010.pdf | 1.44 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
50
20
checked on Feb 7, 2021
Page view(s)
220
checked on Apr 24, 2024
Download(s)
26
checked on Apr 24, 2024