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Probabilistic seismic hazard assessment using legacy data in Georgia

Tuna Onur, Rengin Gok, Tea Godoladze, Irakli Gunia, Giorgi Boichenko, Albert Buzaladze, Nino Tumanova, Manana Dzmanashvili, Lasha Sukhishvili, Zurab Javakishvili, Eric Cowgill, Istvan Bondar and Gurban Yetirmishli
Probabilistic seismic hazard assessment using legacy data in Georgia
Seismological Research Letters (May 2020) 91 (3): 1500-1517

Abstract

The Caucasus has a documented history of cataloging earthquakes stretching back to the beginning of the Christian era. Instrumental seismic observation in the Caucasus began in 1899, when the first seismograph was installed in Tbilisi, Georgia. During the Soviet era (1921-1991 in Georgia), the number of seismic stations increased in the region, providing better network coverage and a valuable dataset for seismic research. Data from many thousands of earthquakes recorded by this regional network was stored on paper in seismic bulletins. As part of the project outlined in this article, we pulled together and digitized all available paper bulletins from Georgia and neighboring countries. This allowed significant improvements in location accuracy and recalculation of more robust moment magnitudes for earthquakes in this region. It also paved the way for future collaboration and data exchange among the countries in the Caucasus. The resulting earthquake catalog with the new locations and magnitudes was used to conduct a probabilistic seismic hazard assessment to support a major update to the building code in Georgia to align it with the European codes. This article outlines the improvements made to the earthquake catalog in Georgia using legacy data and the new hazard assessment based on this improved dataset.


ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 91
Serial Issue: 3
Title: Probabilistic seismic hazard assessment using legacy data in Georgia
Affiliation: Onur Seemann Consulting, Victoria, BC, Canada
Pages: 1500-1517
Published: 202005
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 39
Accession Number: 2020-070542
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N30°19'60" - N35°00'00", W85°34'60" - W80°45'00"
N41°43'00" - N41°43'00", E44°47'60" - E44°47'60"
N41°00'00" - N44°00'00", E40°00'00" - E48°00'00"
Secondary Affiliation: Lawrence Livermore National Laboratory, USA, United StatesIlia State University, GEO, Georgian RepublicUniversity of California at Davis, USA, United StatesHungarian Academy of Sciences, HUN, HungaryAzerbaijan National Academy of Sciences, AZE, Azerbaijan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202020
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