Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6275
AuthorsCannata, A.* 
Di Grazia, G.* 
Montalto, P.* 
Aliotta, M.* 
Patanè, D.* 
Boschi, E.* 
TitleResponse of Mount Etna to dynamic stresses from distant earthquakes
Issue Date2-Dec-2010
Series/Report no./115 (2010)
DOI10.1029/2010JB007487
URIhttp://hdl.handle.net/2122/6275
KeywordsMt. Etna volcano
dynamic stress transfer
triggered eruption
triggered seismicity
volcano seismology
Subject Classification04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
AbstractInfluences of distant earthquakes on volcanic systems by dynamic stress transfer are well documented. We analyzed seismic signals and volcanic activity at Mount Etna during two periods, January 2006 and May 2008, that clearly showed variations coincident with distant earthquakes. In the first period, characterized by mild volcano activity, the effect of the dynamic stress transfer, caused by an earthquake in Greece (M = 6.8), was twofold: (1) banded tremor activity changed its features and almost disappeared; (2) a swarm of volcano‐tectonic (VT) earthquakes took place. The changes of the banded tremor were likely due to variations in rock permeability, caused by fluid flows driven by dynamic strain. The VT earthquake swarm probably developed as a secondary process, promoted by the dynamically triggered activation of magmatic fluids. The second period, May 2008, showed an intense explosive activity. During this interval, the dynamic stress transfer, associated with the arrival of the seismic waves of the Sichuan earthquake (M = 7.9), affected the character of the seismo‐volcanic signals and on the following day triggered an eruption. In particular, we observed changes in volcanic tremor and increases of both occurrence rate and energy of long period events. In this case, we suggest that dynamic stress transfer caused nucleation of new bubbles in volatile‐rich magma bodies with consequent buildup of pressure, highlighted by the increase of long period activity, followed by the occurrence of an eruption. We conclude that stresses from distant earthquakes are capable of modifying the state of the volcano.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
Cannata et al., 2010 JGR dynamic stress.pdf4.67 MBAdobe PDFView/Open
Show full item record

Page view(s)

107
Last Week
0
Last month
checked on Jun 27, 2017

Download(s)

31
checked on Jun 27, 2017

Google ScholarTM

Check

Altmetric