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Hydrodynamic and seismic response to teleseismic waves of strong remote earthquakes in Caucasus

Chelidze Tamaz, Melikadze Giorgi, Kobzev Gennady, Shengelia Ia, Jorjiashvili Nato, Mepharidze Ekaterine

Acta Geophysica

2019

Vol. 67, no. 1

1--16

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 hydroseismic effects is more straightforward and could render new important information on hydroseismic processes and, possibly, on the local stress state in a given block of the Earth crust. We tried to find out which parameter of the teleseismic wave dominates the hydroseismic response (susceptibility)—epicentral distance or velocity.

M9 Tohoku Earthquake Hydro- and Seismic Response in the Caucasus and North Turkey

Chelidze T. L., Shengeli I., Zhukova N., Matcharashvili T., Melikadze G., Kobzev G.

Acta Geophysica

2016

Vol. 64, no. 3

567--588

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 (hydroseismograms). Clear identical anomalies in the deep borehole water levels have been observed on a large part of the territory of Georgia during passing of the S and Love–Rayleigh teleseismic waves (including also multiple surface Rayleigh waves) of the 2011 Tohoku M9 earthquake. The analysis carried out in order to find dynamically triggered events (non-volcanic tremors) of the Tohoku earthquake by the accepted methodology has not revealed a clear tremor signature in the test area: the Caucasus and North Turkey. The possible mechanisms of some seismic signals of unknown origin observed during passage of teleseismic waves of Tohoku earthquake are discussed.