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.

scholarly journals Reconstruction of the eruptive activity on the NE sector of Stromboli volcano: timing of flank eruptions since 15 ka

2010 ◽  
Vol 73 (1) ◽  
pp. 101-112 ◽  
Author(s):  
Sonia Calvari ◽  
Stefano Branca ◽  
Rosa Anna Corsaro ◽  
Emanuela De Beni ◽  
Lucia Miraglia ◽  
...  
Keyword(s):  
Stromboli Volcano ◽  
Eruptive Activity ◽  
Flank Eruptions

scholarly journals Integration of Ground-Based Remote-Sensing and In Situ Multidisciplinary Monitoring Data to Analyze the Eruptive Activity of Stromboli Volcano in 2017–2018

2019 ◽  
Vol 11 (15) ◽  
pp. 1813 ◽  
Author(s):  
Flora Giudicepietro ◽  
Sonia Calvari ◽  
Salvatore Alparone ◽  
Francesca Bianco ◽  
Alessandro Bonaccorso ◽  
...  
Keyword(s):  
Video Camera ◽  
Geochemical Data ◽  
Monitoring Networks ◽  
Stromboli Volcano ◽  
Eruptive Activity ◽  
Magma Supply ◽  
Multidisciplinary Data ◽  
Thermal Video

After a period of mild eruptive activity, Stromboli showed between 2017 and 2018 a reawakening phase, with an increase in the eruptive activity starting in May 2017. The alert level of the volcano was raised from “green” (base) to “yellow” (attention) on 7 December 2017, and a small lava overflowed the crater rim on 15 December 2017. Between July 2017 and August 2018 the monitoring networks recorded nine major explosions, which are a serious hazard for Stromboli because they affect the summit area, crowded by tourists. We studied the 2017–2018 eruptive phase through the analysis of multidisciplinary data comprising thermal video-camera images, seismic, geodetic and geochemical data. We focused on the major explosion mechanism analyzing the well-recorded 1 December 2017 major explosion as a case study. We found that the 2017–2018 eruptive phase is consistent with a greater gas-rich magma supply in the shallow system. Furthermore, through the analysis of the case study major explosion, we identified precursory phases in the strainmeter and seismic data occurring 77 and 38 s before the explosive jet reached the eruptive vent, respectively. On the basis of these short-term precursors, we propose an automatic timely alarm system for major explosions at Stromboli volcano.

scholarly journals On the origin of the long-period tremor recorded at Stromboli volcano (Italy)

1996 ◽  
Vol 39 (2) ◽  
Author(s):  
T. Braun ◽  
J. Neuberg ◽  
M. Ripepe
Keyword(s):  
Particle Motion ◽  
Plane Waves ◽  
Seismic Source ◽  
Stromboli Volcano ◽  
Volcanic Origin ◽  
Arrival Times ◽  
Long Period ◽  
Volcanic Source ◽  
Seismic Amplitudes ◽  
Primary Frequency

This investigation deals with the nature of the long-period seismic signals (>1 s) observed at Stromboli and addresses the question whether they are of volcanic origin or produced by sources such as Ocean Microseisms (OMS). We present results from the analysis of seismic broadband data recorded during 1992 by an array of 9 Guralp CMG-3T seismometers. The determination of the Array Response Function (ARF) shows that array techniques like delay-and-sum beamforming cannot be applied for this purpose, as the extension of the array is limited by the geographical constraint of the island of Stromboli volcano, being simply too small. Spectral analysis reveals three main peaks with periods at 4.8 s, 6 s and 10 s which are not stable in time but vary according to the regional meteorological situation. Whereas 4.8 s and 10 s show up in amplitude spectra calculated during rainy and stormy weather, the 6 s period can be observed during a period of good weather. The signals were first narrowly filtered and then cross correlation, particle motion and amplitudes of the main long periods studied in detail. Relative arrival times as well as seismic amplitudes of the filtered traces do not show any systematic feature but vary with time. Particle motion analysis demonstrates that all long-period signals are recorded by the array as plane waves and that the main propagation direction of the 10 s signal is parallel to the wind direction. No correlation with volcanic activity is obvious. We conclude therefore that the three main long periods are not generated by a close volcanic source. We assume a local cyclone to be the seismic source at 4.8 s and 10 s, which represent the Double Frequency (DF-band) and the Primary Frequency (PF-band), respectively. Concerning the 6 s peak, we speculate a cyclone near the British Isles to act as a seismic source.

scholarly journals Variable Magnitude and Intensity of Strombolian Explosions: Focus on the Eruptive Processes for a First Classification Scheme for Stromboli Volcano (Italy)

2021 ◽  
Vol 13 (5) ◽  
pp. 944
Author(s):  
Sonia Calvari ◽  
Flora Giudicepietro ◽  
Federico Di Traglia ◽  
Alessandro Bonaccorso ◽  
Giovanni Macedonio ◽  
...  
Keyword(s):  
Ground Deformation ◽  
Local Population ◽  
High Energy ◽  
Explosive Activity ◽  
Stromboli Volcano ◽  
Strombolian Activity ◽  
Quantitative Classification ◽  
Strombolian Explosions ◽  
Explosive Events

Strombolian activity varies in magnitude and intensity and may evolve into a threat for the local populations living on volcanoes with persistent or semi-persistent activity. A key example comes from the activity of Stromboli volcano (Italy). The “ordinary” Strombolian activity, consisting in intermittent ejection of bombs and lapilli around the eruptive vents, is sometimes interrupted by high-energy explosive events (locally called major or paroxysmal explosions), which can affect very large areas. Recently, the 3 July 2019 explosive paroxysm at Stromboli volcano caused serious concerns in the local population and media, having killed one tourist while hiking on the volcano. Major explosions, albeit not endangering inhabited areas, often produce a fallout of bombs and lapilli in zones frequented by tourists. Despite this, the classification of Strombolian explosions on the basis of their intensity derives from measurements that are not always replicable (i.e., field surveys). Hence the need for a fast, objective and quantitative classification of explosive activity. Here, we use images of the monitoring camera network, seismicity and ground deformation data, to characterize and distinguish paroxysms, impacting the whole island, from major explosions, that affect the summit of the volcano above 500 m elevation, and from the persistent, mild explosive activity that normally has no impact on the local population. This analysis comprises 12 explosive events occurring at Stromboli after 25 June 2019 and is updated to 6 December 2020.

Chapter 14 Stromboli volcano, Aeolian Islands (Italy): present eruptive activity and hazards

2013 ◽  
Vol 37 (1) ◽  
pp. 473-490 ◽  
Author(s):  
M. Rosi ◽  
M. Pistolesi ◽  
A. Bertagnini ◽  
P. Landi ◽  
M. Pompilio ◽  
...  
Keyword(s):  
Stromboli Volcano ◽  
Eruptive Activity ◽  
Aeolian Islands
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