Ia Shengelia

Ilia State University | ISU · Institute of the Earth Sciences and National Seismic monitoring Center

The attenuation of high-frequency seismic waves was investigated in the crust beneath Tbilisi and the surrounding territory by analysing 225 local earthquakes that occurred from 2008 to 2020 and were recorded by eight seismic stations. The quality factors of coda waves QC and direct P and S waves, QP and QS, were estimated using the single backscat...

Strong ground motions caused by earthquakes with magnitudes ranging from 3.5 to 6.9 and hypocentral distances of up to 300 km were recorded by local broadband stations and three-component accelerograms within Georgia’s enhanced digital seismic network. Such data mixing is particularly effective in areas where strong ground motion data are lacking....

The frequency-dependent parameters of attenuation of P and S waves in one of the most seismically active regions, of the Javakheti plateau, have been estimated using digital data for the first time. We have analyzed and processed hundred and fifty local shallow earthquakes that occurred from 2006 to 2018 and were recorded by five seismic stations....

The aim of this paper was to analyze the hydroseismic response of water level in boreholes during the passage of wave trains of remote strong earthquakes and the pattern of local seismic events, dynamically triggered by these earthquakes. As the exact type of forcing (certain phase of wave train) can be identified, the interpretation of hydroseismi...

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...

Presently, there are a lot of observations on the significant impact of strong remote earthquakes on underground water and local seismicity. Teleseismic wave trains of strong earthquakes give rise to several hydraulic effects in boreholes, namely permanent water level changes and water level oscillations, which closely mimic the seismograms (hydros...

Seismic hazard assessment is a very important issue for seismic design and engineering projects. Generally, probabilistic seismic hazard assessment (PSHA) is used for such kind of studies, which gives a probabilistic description of earthquake characteristics such as selected ground motion parameter (peak ground acceleration or spectral acceleration...

In the present research we investigate variation of scaling features of earthquakes’ temporal and spatial distribution in Caucasus from 1960 to 2014. Data sets of waiting times and interearthquakes distances were obtained from the original and declustered Caucasus catalogues. For the assessment of long-range time-correlations of used data sets the...

ABSTRACT. The dynamic triggering due to the great Tohoku M 9 earthquake Japan (2011) was observed in local seismicity all around the globe. We presume that Tohoku EQ could also trigger local seismic events in Georgia (Caucasus), which is separated from Japan by 7800 km. It was discovered during integrated analysis of seismic and water level records...

Investigation of complex dynamics of ambient seismic noise remains as an important scientific research challenge. In this work we investigated dynamical features of the ambient noises at Oni seismic station, Georgia. We used stochastic model reconstruction method from measured data sets. Seismic records for different time periods around Oni seismic...

Seventy-two local earthquakes were analyzed and the quality factor (Q(c)) was calculated for three regions of Georgia using the single-scattering model in the frequency range of 1-32 Hz. Standard International Association of Seismology and Physics of the Earth's Interior (IASPEI) routines for the coda Q(c) determination have been used. The coda win...