1991 Racha earthquake

A large mass of Jurassic volcanic rock fell onto water-saturated alluvium, combining to form the debris avalanche.The debris avalanche, which had an estimated volume of over 3 million m3, swept down a valley through Khokheti, blocking the Gebura River, forming a 100-m-high dam, that breached soon afterwards, causing more destruction.Two of the earth slides showed a delayed movement, with most displacement occurring a few days after the main shock.The Chordi landslide was active before the earthquake and showed only minor movement at the time of the main shock.It was also due to reverse faulting on a north-northeast-dipping plane, although with a significant dextral (right lateral) strike-slip component.
USGS shake map for the earthquake
GeorgiaAmbrolauriGreater CaucasusearthquakeCaucasusLesser CaucasuscollisionArabian plateEurasian platefold and thrust beltOligoceneshake mapArchangel Church near Zemo KrikhilandslidesJurassicvolcanic rockalluviumclaystoneaftershockTskhinvalimagnitudeMSK scalefocal mechanismepicenterGeorgian–Ossetian conflictList of earthquakes in 1991List of earthquakes in Georgia (country)Sieh, K. E.Allen, C. R.Oxford University PressNational Geophysical Data CenterBibcodeEarthquakes in 1991Hindu KushAlto MayoSierra MadreKalabahiGuatemalaUttarkashiEarthquakes in Georgia1088 Tmogvi1139 Ganja1920 Gori2002 Tbilisi