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Ground motion prediction equations based on shallow crustal earthquakes in Georgia and the surrounding Caucasus

Earthquake Science 2022年第6期35卷 497-509页

作者： jorjiashvili nato Shengelia Ia Godoladze Tea Gunia Irakli Akubardia Dimitri Institute of Earth Sciences and National Seismic Monitoring Center Ilia State UniversityTbilisi 0177Georgia

Strong ground motions caused by earthquakes with magnitudes ranging from 3.5 to 6.9 and hypocentral distances of up to 300km were recorded by local broadband stations and three-component accelerograms within Georgia’s enhanced digital seismic *** data mixing is particularly effective in areas where strong ground motion data are *** data were used to produce models based on ground-motion prediction equations(GMPEs),one benefit of which is that they take into consideration information from waveforms across a wide range of *** this study,models were developed to predict ground motions for peak ground acceleration and 5%-damped pseudo-absolute-acceleration spectra for periods between 0.01 and 10 ***-period ground motions decayed faster than long-period motions,though decay was still in the order of approximately 1/*** mechanisms and local soil conditions greatly influence *** spectral acceleration(SA)of thrust faults was higher than that for either strike-slip or normal faults but the influence of strike-slip faulting on SA was slightly greater than that for normal *** soils also caused significantly more amplification than rocky sites.

关键词： strong ground motion peak ground acceleration spectral acceleration shallow earthquake

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Integration of Geophysical and Geotechnical Soil Characteristics for Local Site Seismic Design in Georgia

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Open Journal of Earthquake Research 2018年第2期7卷 108-123页

作者： N. jorjiashvili M. Gigiberia I. Shengelia M. Otinashvili Ilia State University Tbilisi Georgia

Recently, number of new constructions and engineering projects increased in Georgia, especially in Tbilisi, the capital of Georgia. Because of significant seismic activity of Caucasus region, seismic hazard assessment is very important issue for seismic-designing of engineering projects. Due to modern building codes, complex study of the local area is crucial for proper design of any type of constructions. Among them, following studies should be performed: probabilistic seismic hazard assessment, geological, geotechnical, geophysical, etc. After that, all information should be merged to each other and taken into account while designing of the project. In this paper, location of one construction site was selected as an application of complex study in order to show how can be merged different studies to each other. At the beginning, geological survey (well drilling) and geotechnical studies including laboratory tests were performed. Then geophysical profiling and downhole tests in wells were done by obtaining direct and shear wave velocities including estimation of physical-mechanical parameters. Next, probabilistic seismic hazard assessment and site-depended seismic hazard assessment were performed based on all information obtained by different studies. As a result, influence of local soil amplification on seismic hazard assessment is shown for the study area.

关键词： Seismic Hazard Peak Ground Acceleration Response Spectra Ground Motion Geophysical Investigations

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