Motif Discovery on Seismic Amplitude Time Series: The Case Study of Mt Etna 2011 Eruptive Activity

Algorithms searching for similar patterns are widely used in seismology both when the waveforms of the events of interest are known and when there is no a priori-knowledge. Such methods usually make use of the cross-correlation coefficient as a measure of similarity; if there is no a-priori knowledg...

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Published inPure and applied geophysics Vol. 170; no. 4; pp. 529 - 545
Main Authors Cassisi, Carmelo, Aliotta, Marco, Cannata, Andrea, Montalto, Placido, Patanè, Domenico, Pulvirenti, Alfredo, Spampinato, Letizia
Format Journal Article
LanguageEnglish
Published Basel SP Birkhäuser Verlag Basel 01.04.2013
Springer Nature B.V
Subjects
Algorithms
Amplitudes
Case studies
Correlation coefficient
Earth and Environmental Science
Earth Sciences
Earthquakes
Geophysics/Geodesy
Indexing
Lava
Searching
Seismic activity
Seismic phenomena
Seismology
Time series
Volcanoes
Motif discovery
seismic RMS
volcano monitoring
pattern recognition
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Summary:Algorithms searching for similar patterns are widely used in seismology both when the waveforms of the events of interest are known and when there is no a priori-knowledge. Such methods usually make use of the cross-correlation coefficient as a measure of similarity; if there is no a-priori knowledge, they behave as brute-force searching algorithms. The disadvantage of these methods, preventing or limiting their application to very large datasets, is computational complexity. The Mueen–Keogh (MK) algorithm overcomes this limitation by means of two optimization techniques—the early abandoning concept and space indexing. Here, we apply the MK algorithm to amplitude time series retrieved from seismic signals recorded during episodic eruptive activity of Mt Etna in 2011. By adequately tuning the input to the MK algorithm we found eight motif groups characterized by distinct seismic amplitude trends, each related to a different phenomenon. In particular, we observed that earthquakes are accompanied by sharp increases and decreases in seismic amplitude whereas lava fountains are accompanied by slower changes. These results demonstrate that the MK algorithm, because of its particular features, may have wide applicability in seismology.
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ISSN:0033-4553
1420-9136
DOI:10.1007/s00024-012-0560-y