Articles | Volume 4, issue 5/6
Nat. Hazards Earth Syst. Sci., 4, 663–667, 2004
https://doi.org/10.5194/nhess-4-663-2004

Special issue: Precursory phenomena, seismic hazard evaluation and seismo-tectonic...

Nat. Hazards Earth Syst. Sci., 4, 663–667, 2004
https://doi.org/10.5194/nhess-4-663-2004

  01 Nov 2004

01 Nov 2004

Principal component analysis of geoelectrical signals measured in the seismically active area of Basilicata Region (southern Italy)

L. Telesca1, G. Colangelo1, K. Hattori2, and V. Lapenna1 L. Telesca et al.
  • 1Istituto di Metodologie per l’Analisi Ambientale, CNR, Tito (PZ), Italy
  • 2Marine Biosystems Research Center, Chiba University, Japan

Abstract. Geoelectrical fluctuations are the end product of several geophysical phenomena. In particular geoelectrical signals measured in seismically active areas can be attributed to stress and strain changes, associated with earthquakes. The complexity of this problem has suggested the development of advanced statistical methods to investigate the heterogeneous nature of these fluctuations. In this paper we analysed the time dynamics of short-term variability of geoelectrical field measured at Giuliano station, located in Basilicata Region, one of the most seismically active areas of southern Italy. We applied the principal component analysis (PCA). The analysis has shown earthquake precursory patterns in the daily variation of the principal components, revealing that the PCA approach is promising for monitoring seismic areas.

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