Please use this identifier to cite or link to this item:
Authors: Greco, F.* 
Currenti, G.* 
D'Agostino, G.* 
Germak, A.* 
Napoli, R.* 
Pistorio, A.* 
Del Negro, C.* 
Title: Combining relative and absolute gravity measurements to enhance volcano monitoring
Journal: Bulletin of volcanology 
Series/Report no.: 7/74(2012)
Publisher: Springer Berlin Heidelberg
Issue Date: 16-Jun-2012
DOI: 10.1007/s00445-012-0630-0
Keywords: Mt Etna . Relative gravity . Absolute gravity .
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
Abstract: To achieve a balance between uncertainty and efficiency in gravity measurements, we have investigated the applicability of combined measurements of absolute and relative gravity as a hybrid method for volcano monitoring. Between 2007 and 2009, three hybrid gravity surveys were conducted at Mt Etna volcano, in June 2007, July 2008, and July 2009. Absolute gravity data were collected with two absolute gravimeters, which represent the state of the art in recent advances in ballistic gravimeter technology: (1) the commercial instrument FG5#238 and (2) the prototype instrument IMGC-02. We carried out several field surveys and confirmed that both the absolute gravimeters can still achieve a 10 μGal or better uncertainty even when they are operated in severe environmental conditions. The use of absolute gravimeters in a field survey of the summit area of Mt Etna is unprecedented. The annual changes of the gravity measured over 2007–2008 and 2008–2009 provide unequivocal evidence that during the 2007–2009 period, two main phenomena of subsurface mass redistribution occurred in distinct sectors of the volcano, accompanying different eruptive episodes. From 2007 to 2008, a gravity change of −60 μGal was concentrated around the North- East Rift. This coincided with a zone affected by strong extensional tectonics, and hence might have been related to the opening of new voids. Between 2008 and 2009, a North-South elongate feature with a maximum gravity change of +80 μGal was identified in the summit craters area. This is interpreted to indicate recharge of a deepintermediate magma storage zone, which could have occurred when the 2008–2009 eruption was still ongoing.
Appears in Collections:Article published / in press

Files in This Item:
File Description SizeFormat Existing users please Login
Greco et al 2012 BV.pdfMain article638.92 kBAdobe PDF
Show full item record

Citations 50

Last Week
Last month
checked on Feb 10, 2021

Page view(s)

Last Week
Last month
checked on May 16, 2021


checked on May 16, 2021

Google ScholarTM