Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 4 1 2004 10.5194/nhess-4-53-2004 http://www.nat-hazards-earth-syst-sci.net/4/53/2004/ http://www.nat-hazards-earth-syst-sci.net/4/53/2004/nhess-4-53-2004.html http://www.nat-hazards-earth-syst-sci.net/4/53/2004/nhess-4-53-2004.pdf 53 58 2004-03-01 Tectonic sources of caucasus strong earthquakes M. Kachakhidze N. Kachakhidze R. Kiladze V. Kukhianidze G. Ramishvili Tbilisi State University, Chavchavadze st. 2, Tbilisi 380028, Georgia Abastumani Astrophysical Observatory, Kazbegi av. 2a, Tbilisi 380060, Georgia The method called "phase cone" is developed in order to define the location, time of arising and velocity of the earthquakes initiating the low-speed interference stress waves. From the data of the strong earthquakes with <i>M</i>&#x2265;6.0 in Caucasus region during 1900-1992, the immigrators or tectonic sources of low-speed waves were revealed, interference nodes of which had initiated 19&nbsp;earthquakes out of total 33. <P style="line-height: 20px;"> The time of arising of low-speed stress waves or periods of awaking of tectonic sources is defined. <P style="line-height: 20px;"> The velocities of constant initiative waves for all events were calculated. Its average value is equal to 2.97km per year.