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Patané et al., 2004

Patané D., Cocina O., Falsaperla S., Privitera E., Spampinato S., 2004. Mt. Etna volcano: A Seismological Framework. In: Bonaccorso A., Calvari S., Coltelli M., Del Negro C., Falsaperla S. (ed.), Mt. Etna: volcano laboratory, American Geophysical Union, Geophysical monograph, 143, pp. 147-165 + CD. https://doi.org/10.1029/GM143

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Abstract

Mount Etna is one of the most active and powerful basaltic volcanoes in the world, with an historical record of documented eruptions going back over 2000 years. It is located in eastern Sicily in a complex geodynamic framework, where major regional structural lineaments play a key role in the dynamic processes of the volcano [e.g., Bonaccorso et al., 1996]. Several years of structural and geophysical observations have revealed how the majority of the eruptive fracture systems activated in the last 30 years correspond to those of historical eruptions [e.g., Azzaro and Neri, 1992]. The orientation of the fractures coincides mostly with two structural trends, NNW-SSE and NE-SW, observed both in the volcanic area and in the regional context. These alignments are hypothesized to be the main volcano-genetic structures [e.g., Bonaccorso et al., 1996; Gresta et al., 1998] controlling the evolution of Mt. Etna, as their interference establishes a weak zone along which magma can rise from depth [Rasà et al., 1995]. In the second half of the last century, after nearly 20 years without any major flank eruption, a series of effusive eruptions started in 1971. In the following 15 years, fourteen main sub-terminal and/or flank eruptions affected different eruptive systems [e.g., Azzaro and Neri, 1992]. Afterwards, about two years withouth eruptive activity separated the October 1986-March 1987 eruption from that of 1989, which was one of the most important in terms of effusion rate. This eruption was probably preceded by a major intrusive episode [Ferrucci et al., 1993; Rymer et al., 1993] which also fed the 1991-1993 flank eruption. The latter was the most important lateral eruption at Mt. Etna in the last three centuries, both in terms of duration (476 days) and volume of lava erupted (ca. 250 x 106 m3). After the end of this eruption, volcanic activity was confined to the summit area until the July-August 2001 flank eruption.

Seismological observations have provided information on both the dynamics and structure of the volcano, in addition to their interaction with the regional tectonic structures. Today it appears clear that volcanism and tectonics in the Etnean area interact closely [e.g., Bonaccorso et al., 1996; Cocina et al., 1998; Bonaccorso, 2001; Bonaccorso and Patanè, 2001; Patanè and Privitera, 2001], although the problem of the driving mechanisms of magma upwelling remains an open question. Unfortunately, the local, permanent seismic network had a low density of stations prior to 1990 which severely affected hypocentral location constraints and our knowledge on magma dynamics in the shallower crust. Only from the early 1990's has seismic data been available in digital format for a significant number of stations as well as for three-component sensors [e.g., Patanè et al., 1999; Barberi et al., 2000; Patanè and Privitera, 2001; Patanè et al., 2003]. These improvements have allowed to put high-quality constraints on seismic activity occurring at almost all depths in recent years, and to perform studies which tackle the link between seismicity and eruptive activity.

In this paper we present an overview of seismic activity affecting the volcano in the period 1978-2001. In particular, we focus our attention on the years between 1988 and 2001. We discuss the interaction between the regional and local stress field in this time span, and define seismic constraints on the magma source which yielded eruptive activity.

Nell'archivio ci sono In the archive there are 50 terremoti provenienti da questo studio: earthquakes considered from this study:


   
molto grandiextra large
   
grandilarge
   
medimedium
   
piccolismall
   
molto piccolivery small
non parametrizzatinot determined
falsifake
 

Clicca sulla riga per individuare il terremoto sulla mappa o sulla lente per ottenere più informazioni.Click the row to highlight the earthquake on the map or the lens to obtain more information.

  DataDate    Area epicentraleEpicentral area    MDPs   Imax  EQ in
CPTI15
EQ in
CPTI15
Riferim. in
CPTI15
CPTI15
reference
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1988 06 19 01 44 23.00-  -    
1988 10 28 18 48 45.00-  -    
1989 02 16 19 27 03.62-  -    
1989 06 28 21 36 30.45-  -    
1989 07 27 15 08 51.00-  -    
1991 12 15 20 00 50.00-  -    
1993 06 14 05 13 05.58-  -    
1995 02 10 08 15 45.00-  -    
1996 12 02 13 01 40.00-  -    
1997 09 02 10 42 40.72-  -    
1997 10 29 12 02 45.00-  -    
1997 11 11 07 27 56.00-  -    
1997 12 03 08 28 36.46-  -    
1997 12 24 09 40 07.00-  -    
1998 01 10 08 45 18.00-  -    
1998 05 22 11 54 43.00-  -    
1999 12 26 14 19 50.00-  -    
2000 01 11 08 20 53.00-  -    
2001 01 09 02 51 58.00-  -    
2001 04 22 13 56 34.00-  -    
2001 05 03 21 41 36.00-  -    
2001 07 13 03 13 33.00-  -    
2001 07 13 03 15 32.00-  -    
2001 07 13 05 11 48.00-  -    
2001 07 14 03 04 52.00-  -    
2001 07 14 05 53 18.00-  -    
2001 07 14 07 38 15.00-  -    
2001 07 14 08 54 09.00-  -    
2001 07 14 08 57 33.00-  -    
2001 07 14 16 52 36.00-  -    
2001 07 15 00 14 17.00-  -    
2001 07 15 03 12 06.00-  -    
2001 07 15 03 28 21.00-  -    
2001 07 15 04 57 31.00-  -    
2001 07 15 04 57 48.00-  -    
2001 07 15 07 45 31.00-  -    
2001 07 15 09 00 59.00-  -    
2001 07 15 15 02 37.00-  -    
2001 07 16 15 08 25.00-  -    
2001 07 16 20 27 03.00-  -    
2001 07 16 23 19 50.00-  -    
2001 07 17 00 59 44.00-  -    
2001 07 17 02 40 08.00-  -    
2001 07 17 05 33 01.00-  -    
2001 07 17 10 08 18.00-  -    
2001 07 17 10 48 31.00-  -    
2001 07 17 13 40 19.00-  -    
2001 07 17 13 46 16.00-  -    
2001 07 22 12 32 14.00-  -    
2001 08 20 22 44 59.00-  -