HR: 1340h
AN: S53B-1104    [Abstracts]
TI: Physically Based Seismic Hazard Analysis of Tbilisi, Republic of Georgia
AU: * Gogoladze, T
S53B-1104 AF: Institute of Geophysics, National Academy of Sciences, Tbilisi, Tbilisi, 00000 Georgia
AU: Hutchings, L
EM: hutchings2@llnl.gov
AF: Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551 United States
AU: Javakhishvili, Z
EM: z.javakh@ig.acnet.ge
AF: Institute of Geophysics, National Academy of Sciences, Tbilisi, Tbilisi, 00000 Georgia
AU: Foxall, W
EM: foxall1@llnl.gov
AF: Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551 United States
AU: Elashvili, M
EM: mikheil@ig.acnet.ge
AF: Institute of Geophysics, National Academy of Sciences, Tbilisi, Tbilisi, 00000 Georgia
AU: Hunt, D
EM: hunt45@llnl.gov
AF: Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551 United States
AB: We apply a physically based approach to synthesize possible ground motion from future earthquakes within and near Tbilisi, capital of the Republic of Georgia. We utilize earthquake locations, focal mechanisms and moment tensor inversion to better identify the possible fault locations. We develop a suite a ground motions that can be expected from each fault over several cycles of historic seismicity and use the time histories to develop a site specific PSHA for Tbilisi. The Caucasus is one of the most active segments of the Alpine-Himalayan collision belt. Based on Geological and Geophysical investigations several active faults surround Tbilisi, two of them intersect the north and south parts of the city. Historical earthquakes occurred in 1682, 1803, 1804, 1819. Based upon macroseismic effects of these moderate events (intensity 5-6) the epicentres are assumed to be within the centre of the city. On 14 December 2000 and 25 April 2002 Tbilisi was hit by magnitude Ms= 3.5 and 4.5 earthquakes, respectively. Tbilisi city has a population of about 1.3 M (about one fourth of population of whole country), and engineering structures are generally poorly designed. Over 60 people died and 100 buildings collapsed as a result of the 2002 earthquake. Our main concern is what will be the effects of future possibly larger earthquakes and what design standards will be used for new construction.
DE: 0560 Numerical solutions (4255)
SC: Seismology [S]
MN: Fall Meeting 2005