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Some relationships between VAN Seismic Electric Signals (SES) and earthquake parameters: study for the 1995-2007 period

Dologlou E.

Acta Geophysica

2008

Vol. 56, no. 4

1015-1024

A 12-year period experimental data, from 1 January 1995, to 20 August 2007, have been examined for possible correlations between Seismic Electric Signals (SES) of the VAN method and source parameters of the corresponding earthquakes in Western Greece. During that period 13 earthquakes of magnitude M W //5 with epicenters in the area 19–24°E, 36–41°N and available the CMT solutions (Centroid Moment Tensor focal mechanism solutions) have been found to be preceded by a SES each time at one of the three VAN stations of IOA, PIR or PAT. The results of IOA and PIR stations are compared to those reported by Uyeda et al. 1999, for the previous period 1983–1994. The IOA station seems to be sensitive to earthquakes with thrust type mechanisms being mainly consistent to its past behavior. The PIR station, which is moved from its previous position by few kilometers, exhibits some changes. It detects now both strike slip and thrust type earthquakes and becomes sensitive to new areas indicating probably the strong dependence of the SES station detection ability upon its location.

Comments on the predictions of large earthquakes issued by VAN during the last decade

Dologlou E., Lazaridou M.

Acta Geophysica Polonica

1999

Vol. 47, nr 1

59-75

Uyeda in an intuitive study has recently shown that an investigation of the predictions issued for large earthquakes in Greece can give a convincing answer to the question whether or not VAN predictions are to be ascribed to chance. In this paper, we give clarifications concerning some misunderstanding on the VAN predictions (of large earthquakes) issued by VAN during the last decade.