Publication Date:
2017-04-04
Description:
The last effusive eruption on February 27, 2007 at Stromboli volcano
was characterized by the occurrence of a particular typology of seismic events
named “hybrids”. During March about 4000 of these signals were recorded, and
three main swarms happened: the first one on days 6-8, with more than 1200
events; the second one on day 20, with more than 400 events; and the third one on
day 22, with about 600 events. The study of these events and specifically their
location is the main purpose of this work because it not only characterizes a
particular aspect of the 2007 effusive eruption but at the same time can improve
the understanding of the eruptive processes of the volcano. Thus, in order to locate
them it was first necessary to group the signals according to their waveform
similarity and then apply relative location techniques on individual families. To
perform the clustering an unsupervised SOM neural network was used. This
technique is capable of working without any “a-priori” information about data
distribution and structure. Its results have revealed differences in the families of
events recorded during and between the swarms, underlying from a volcanological
point different locations or source mechanisms of the involved structures.
Moreover, they have shown to be consistent compared to those obtained by
applying the Hierarchical Clustering technique. However, in contrast to the latter,
the SOM clustering does not critically depend on its parameters and allows for an
easier result visualization and interpretation.
Description:
Published
Description:
Vietri sul Mare, Salerno
Description:
1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
Description:
reserved
Keywords:
Hybrid events, clustering, SOM, Hierarchical Clustering, neural
;
05. General::05.01. Computational geophysics::05.01.02. Cellular automata, fuzzy logic, genetic alghoritms, neural networks
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Conference paper
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