Basaltic scoria textures from a zoned conduit as precursors to violent Strombolian activity

Geology ◽  
2010 ◽  
Vol 38 (5) ◽  
pp. 439-442 ◽  
Author(s):  
C. Cimarelli ◽  
F. Di Traglia ◽  
J. Taddeucci
Keyword(s):  
Strombolian Activity ◽  
Violent Strombolian

scholarly journals Seismo-volcanic sources on Stromboli volcano

1996 ◽  
Vol 39 (2) ◽  
Author(s):  
J. Neuberg ◽  
R. Luckett
Keyword(s):  
Detailed Analysis ◽  
Particle Motion ◽  
Volcanic Edifice ◽  
Stromboli Volcano ◽  
Eruptive Activity ◽  
Strombolian Activity ◽  
Video Recordings ◽  
Surface Correction ◽  
Steep Slopes ◽  
Precise Time

A detailed analysis of broadband seismic recordings leads to models of eruption mechanisms for Strombolian activity. The data used comprise signals from arrays of nine three-component seismometers and video recordings of visual eruptive activity with precise time reference. As a major tool particle motion analysis is used to locate the seismo-volcanic sources. Here, a surface correction is employed to account for the effects of the steep slopes of the volcanic edifice. After careful filtering of the data single seismic phases can be separated and linked to corresponding eruptive features.

Spectral and dynamical hints on the time scale of preparation of the 5 April 2003 explosion at Stromboli volcano

2006 ◽  
Vol 43 (1) ◽  
pp. 41-55 ◽  
Author(s):  
Roberto Carniel ◽  
Ramon Ortiz ◽  
Mauro Di Cecca
Keyword(s):  
Seismic Data ◽  
Time Scale ◽  
Material Failure ◽  
Stromboli Volcano ◽  
Forecast Method ◽  
Sector Collapse ◽  
Strombolian Activity ◽  
Dynamical Phase ◽  
Paroxysmal Event ◽  
Sciara Del Fuoco

Stromboli volcano is well known for its continuous strombolian activity. Moreover, the volcano occasionally shows effusive phases, the latest in 1985–1986. On 28 December 2002 Stromboli entered a new effusive phase, accompanied by different paroxysmal events that led to considerable hazards for inhabitants and tourists on the island of Stromboli. On 30 December 2002 a major sector collapse affected the Sciara del Fuoco slope and initiated a tsunami. On 5 April 2003 a powerful explosion, which can be compared in size with the most recent explosion in 1930, covered a large part of the normally tourist accessible summit area with bombs. As this explosion was not forecasted, although the island was by then effectively monitored by a dense deployment of instruments, in this paper, we tackle the problem of highlighting the time scale of preparation of this event and conduct a search for possible precursors. For this purpose, we analyze the seismic data preceding the paroxysm with spectral and dynamical methods, highlighting that this paroxysmal event can be seen as the final result of a dynamical phase that started at least 2.5 h before the event. Therefore, this is the time scale during which the search can and should be made for possible precursors. Moreover, the application of the "material failure forecast" method suggests that this final dynamical phase may be just the final acceleration of a process that was building up for at least several days prior to the event.

Violent strombolian and subplinian eruptions at Vesuvius during post-1631 activity

2001 ◽  
Vol 63 (2-3) ◽  
pp. 126-150 ◽  
Author(s):  
Simone Arrighi ◽  
Claudia Principe ◽  
Mauro Rosi
Keyword(s):  
Violent Strombolian ◽  
Subplinian Eruptions

scholarly journals The summer 2019 basaltic Vulcanian eruptions (paroxysms) of Stromboli

2020 ◽  
Vol 83 (1) ◽  
Author(s):  
G. Giordano ◽  
G. De Astis
Keyword(s):  
Time Scales ◽  
Pyroclastic Flows ◽  
Level System ◽  
Subsequent Evolution ◽  
Strombolian Activity ◽  
Effusive Activity ◽  
Convective Region ◽  
Operational Time ◽  
Fall Deposits ◽  
Visual Observations

AbstractStromboli is an active, open conduit mafic volcano, whose persistent mild Strombolian activity is occasionally punctuated by much stronger explosions, known as paroxysms. During summer 2019, the volcano unexpectedly produced one such paroxysm on July 3, followed by intense explosive and intermittent effusive activity culminating in a second paroxysm on August 28. Visual observations and the analysis of the fall deposits associated with the two paroxysms allowed us to reconstruct ballistic exit velocities of up to 160 m s−1. Plume heights of ~ 8.4 km and 6.4 km estimated for the two events correspond to mass eruption rates of 1.1 × 106 kg s−1 and 3.6 × 105 kg s−1, respectively. This is certainly an underestimate as directional pyroclastic flows into which mass was partitioned immediately formed, triggering small tsunamis at the sea entrance. The mass of ballistic spatters and blocks erupted during the July 3 event formed a continuous cover at the summit of the volcano, with a mass calculated at ~ 1.4 × 108 kg. The distribution of fall deposits of both the July 3 and August 28 events suggests that pyroclasts characterized by terminal fall velocities < 10–20 m s−1 remained fully suspended within the convective region of the plume and did not fall at distances closer than ca 1700 m to the vent. Based on the impulsive, blast-like phenomenology of paroxysms as well as the deposit distribution and type, paroxysms are classified as basaltic Vulcanian in style. The evolution of the summer 2019 eruptive events was not properly captured within the framework of the alert level system which is focused on tsunamigenic processes, and this is discussed so as to provide elements for the implementation of the reference scenarios and an upgrade of the system to take into account such events. In particular we find that, although still largely unpredictable, at least at operational time scales, and not necessarily tsunamigenic, Vulcanian eruptions and the subsequent evolution of the eruptive phenomena should be considered for the alert level system. This serves as a warning to the implementation of alert systems where the unexpected needs to be taken into account, even at systems that are believed to be relatively “predictable” as is the case at many persistently active, open vent mafic systems.

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