Publication Date:
2017-04-04
Description:
On 27 February 2007, two NE–SW and NNW–SSE dike-fed effusive vents opened to the North (at 650 and
400 m above sea level, asl) of the summit craters at Stromboli, forming a fissure parallel to the inner walls of
the Sciara del Fuoco (SdF) sector collapse depression. The formation of these vents was soon followed by
rapid subsidence of the summit crater area. This partly obstructed the central conduit, temporarily choking
the fissure and increasing the deformation of the upper part of SdF. The reactivation of the NNW–SSE vent
and the opening of a new vent located at 500 m asl, fed by a second dike, released the internal pressure and
surface deformation ceased. The eruption then continued again from the 400 m vent, after a summit
explosion on 15 March, until ending in early April after a progressive decrease of magma output. Repeated
NE–SW dike intrusions have occurred in recent years, close to the upper SE limit of the SdF. In that zone,
named Bastimento, the eruptive fractures traced the discontinuities that borders the SdF, increasing the risk
of triggering new sector collapse. Whereas the NE–SW trending structures lie along the regional volcanostructural
trend of the Aeolian arc through Stromboli, the NNW–SSE vents are oblique to this trend and may
be controlled by the anomalous stress field within the unstable flank of the SdF. Another fundamental aspect
of the 2007 eruption is the collapse of the central conduit, due to the rapid and deep magma drainage linked
to the opening of the 400 m vent. The intrusion of dikes and development of flank vents during the 2007
eruption could possibly have triggered catastrophic landslides and related tsunami or eruptive paroxysms,
but the opening of new effusive vents released the internal pressures, diminishing the hazard.
Description:
Work funded by INGV and Dipartimento Protezione Civile, Italy.
Description:
Published
Description:
137-144
Description:
1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
Description:
3.2. Tettonica attiva
Description:
3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
Description:
3.6. Fisica del vulcanismo
Description:
4.3. TTC - Scenari di pericolosità vulcanica
Description:
JCR Journal
Description:
reserved
Keywords:
2007 Stromboli eruption
;
Dike-Fed vent
;
Volcano-Tectonics
;
Conduit collapse
;
Flank instability
;
04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous
;
04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous
;
04. Solid Earth::04.04. Geology::04.04.09. Structural geology
;
04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
;
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
;
04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress
;
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
;
04. Solid Earth::04.07. Tectonophysics::04.07.08. Volcanic arcs
;
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
;
05. General::05.08. Risk::05.08.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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