Abstract
Abstract. The seismicity of the last 15 years in the Aegean Sea revealed that earthquakes (Mw > 5) with epicentres falling within the Sporades basin and the confined area north of Samos island were preceded by electric seismic signals (SES) with a remarkably long lead time. A possible explanation of this behaviour by means of specific tectonics and geodynamics which characterise these two regions, such as a significant small crustal thickness and a high heat flow rate, has been attempted. New data seem to strengthen the above hypothesis.
Highlights
IntroductionMany studies on the possible correlation between Seismic Electric Signals (SES) features and associated earthquake parameters have been elaborated and some interesting results occurred
In the last 25 years transient changes of low frequency of the Earth’s telluric field, known as Seismic Electric Signals (SES), have been found to precede large earthquakes in Greece (Varotsos and Alexopoulos, 1984a, b; Varotsos et al, 1993b)
The normal and the strike-slip earthquake mechanisms mainly dominate in the Aegean Sea; in the western part extensional stress expressed by normal faulting and T-axes trending NNW-SSE (Kiratzi and Louvari, 2003) and in the central and eastern Aegean, right lateral strike-slip faults trending in NE-ENE (Kiratzi et al, 1991; Armijo et al, 1996; Kiratzi and Louvari, 2003)
Summary
Many studies on the possible correlation between SES features and associated earthquake parameters have been elaborated and some interesting results occurred. A recent study (Dologlou et al, 2008) revealed that large (M > 5) earthquakes in the Aegean Sea, preceded by SES with an appreciably long lead time, occurred only in specific, confined regions with a remarkably small crustal thickness and a high heat flow (Le Pichon et al, 1984; Makris et al, 2001; Jongsma, 1974). It is of interest and the scope of the present paper to check whether the above-mentioned preliminary dependence findings of the SES long lead time on specific geotectonics is consistent when new data are considered
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