Variations in a LF radio signal on the occasion of the recent seismic and volcanic activity in Southern Italy

2004 ◽  
Vol 29 (4-9) ◽  
pp. 551-557 ◽  
Author(s):  
P.F. Biagi ◽  
R. Piccolo ◽  
L. Castellana ◽  
A. Ermini ◽  
S. Martellucci ◽  
...  
Keyword(s):  
Volcanic Activity ◽  
Southern Italy ◽  
Radio Signal

Tsunami and tephra deposits record interactions between past eruptive activity and landslides at Stromboli volcano, Italy

Geology ◽  
2020 ◽  
Vol 48 (5) ◽  
pp. 436-440 ◽  
Author(s):  
Marco Pistolesi ◽  
Antonella Bertagnini ◽  
Alessio Di Roberto ◽  
Maurizio Ripepe ◽  
Mauro Rosi
Keyword(s):  
Volcanic Activity ◽  
Southern Italy ◽  
Global Scale ◽  
Stromboli Volcano ◽  
Close Link ◽  
Flank Collapse ◽  
Volcanic Events ◽  
Volcanic Islands ◽  
Volcaniclastic Deposits

Abstract Devastation associated with tsunamis is well known on the global scale. Flank collapse at volcanic islands is among the mechanisms triggering tsunamis, but very few examples document interaction between landslides and volcanic activity. The study of three well-preserved medieval tsunami deposits recently discovered along the coast of Stromboli volcano (Aeolian Islands, southern Italy) enabled a detailed characterization of the tsunami sequences intercalated with volcaniclastic deposits and primary tephra and allowed reconstruction of the likely sequence of volcanic events. In one case, a violent explosion possibly preceded the tsunami, whereas in the youngest event, the lateral collapse of the volcano flank triggered a tsunami wave that was rapidly followed by sustained explosive magmatic activity and ensuing prolonged ash venting. The hypothesized tsunami-triggering dynamics suggests a close link between volcanic activity and flank collapse, further confirming that the persistent activity at Stromboli makes the volcano particularly susceptible to tsunami generation.

scholarly journals Disturbances in a VLF radio signal prior the <i>M</i>=4.7 offshore Anzio (central Italy) earthquake on 22 August 2005

2008 ◽  
Vol 8 (5) ◽  
pp. 1041-1048 ◽  
Author(s):  
P. F. Biagi ◽  
L. Castellana ◽  
T. Maggipinto ◽  
D. Loiacono ◽  
V. Augelli ◽  
...  
Keyword(s):  
Southern Italy ◽  
Radio Signal ◽  
Central Italy ◽  
Sampling Rate ◽  
Principal Component ◽  
Offshore Area ◽  
Central Italy Earthquake ◽  
Radio Signals ◽  
Phase Data ◽  
A Site

Abstract. On 22 August 2005 an earthquake with magnitude M=4.7 occurred in the Anzio (central Italy) offshore area. From 2002, a VLF-LF radio receiver is into operation in Bari (southern Italy). The intensity and the phase of the signals transmitted by GB (f=16 kHz, United Kingdom), FR (f=20.9 kHz, France), GE (f=23.4 kHz, Germany), IC (f=37.5 kHz, Island) and IT (f=54 kHz, Sicily, Italy) has been monitored with a 5 s sampling rate. The previous epicenter is near enough to some of the radio paths and the data collected were studied in order to reveal possible seismic effects. The raw analysis revealed a clear drop in the intensity of the FR radio signal on 19 August. Then the wavelet analysis was applied to the intensity and the phase data of the different radio signals. In the mentioned day an increase in the band 60–120 min was revealed in the spectra of the FR signal. Then the principal component analysis was applied and again the 19 August stood up as an anomalous day for the FR radio signal. The path of this signal, among the paths of the five radio signals collected by the Bari receiver, is the nearest to the mentioned epicentre and the anomaly revealed on 19 August appears as a precursor of the earthquake. This result confirms the possible precursor revealed by other researchers in the air Rn content in a site located 5 miles far from the epicenter.

The role of transfer structures on volcanic activity at Campi Flegrei (Southern Italy)

1999 ◽  
Vol 91 (2-4) ◽  
pp. 123-139 ◽  
Author(s):  
V Acocella ◽  
F Salvini ◽  
R Funiciello ◽  
C Faccenna
Keyword(s):  
Volcanic Activity ◽  
Southern Italy ◽  
Campi Flegrei
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