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Short time scale laws in self-potential signals from two different seismically active Mediterranean areas (the Southern Apennine chain and Crete Island)

Colangelo, G; Lanfredi, M; Lapenna, V; Macchiato, M; Vallianatos, F; (2001) Short time scale laws in self-potential signals from two different seismically active Mediterranean areas (the Southern Apennine chain and Crete Island). In: ANNALI DI GEOFISICA. (pp. 421 - 428). EDITRICE COMPOSITORI BOLOGNA

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Abstract

Self-potential time series are investigated to characterise self-potential time scales. The data analysed were recorded in stations located in two active seismic areas of the Mediterranean region, the Southern Apennine chain (Giuliano) and Crete Island (Heraklion), where in past and recent years many destructive seismic events have taken place. The seismological and geological settings, combined with a low level of cultural noise, allow us to consider these areas ideal outdoor laboratories to study the time dynamics of geophysical parameters of electrical nature. At the same time, the different seismological features of such areas make an inter-comparison between the geoelectrical variability observed at the two sites interesting. Fractal analysis tools, able to detect scale laws and quantify persistence features, are used to better understand the background variability properties of the self-potential signals. As results from our analysis, antipersistence seems to be a ubiquitous feature on short time scales (minutes) regardless of environmental conditions. On such scales, the accumulation of random fluctuations is not particularly efficient and significant variations mostly occur as sudden jumps.

Type: Proceedings paper
Title: Short time scale laws in self-potential signals from two different seismically active Mediterranean areas (the Southern Apennine chain and Crete Island)
Event: 2nd International Workshop on Magnetic, Electric and Electromagnetic Methods in Seismology and Volcanology
Location: KHANIA, GREECE
Dates: 1999-09-22 - 1999-09-24
Keywords: self-potential, earthquake prediction, structural analysis, fractals, anomalous diffusion, PRECURSORS, GREECE
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Inst for Risk and Disaster Reduction
URI: http://discovery.ucl.ac.uk/id/eprint/132799
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