Abstract
Abstract. It is acceptable that earthquakes certain exogenous (cosmic) triggering factors may exist in every seismoactive (s/a) region and in Caucasus among them. They have to correct earthquake occurring moment or play the triggering role in case when the region is at the limit of the critical value of the geological medium of course. Our aim is to reveal some exogenous factors possible to initiate earthquakes, on example of Caucasus s/a region, taking into account that the region is very complex by the point of view of the tectonic stress distribution. The compression stress directed from North to South (and vice versa) and the spread stress directed from East to West (and vice versa) are the main stresses acted in Caucasus region. No doubt that action of the smallest external stress may "work" as earthquakes triggering factor. In the presented work the Moon and the Sun perturbations are revealed as initiative agents of earthquakes when the directions of corresponding exogenous forces coincide with the directions of the compression stress or the spreading tectonic stress in the region.
Highlights
System SciencesRamishvili2 1Department of Natural Sciences, St. Andrew The First-Called Georgian University of The Patriarchy of Georgia, Tbilisi, Georgia 2Department of Natural Sciences, Ilia State University, Abastumani Astrophysical Observatory, Tbilisi, Georgia
It is necessary to assume that if it is not the variable stress in the earth the earthquake will occur at the moment, when tectonic stress in the zone of its preparation reaches the certain critical meaning – the limit of the geological medium strength
In every region, including the Caucasus, besides of geological factors it may be the exogenous force of certain direction, which takes role of triggering factor in the occurring process of large earthquakes, if tectonic stress is near to its critical value
Summary
Ramishvili2 1Department of Natural Sciences, St. Andrew The First-Called Georgian University of The Patriarchy of Georgia, Tbilisi, Georgia 2Department of Natural Sciences, Ilia State University, Abastumani Astrophysical Observatory, Tbilisi, Georgia. Received: 2 February 2010 – Revised: 30 May 2010 – Accepted: 13 July 2010 – Published: 29 July 2010
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