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STUDY OF THE HYDROGEOLOGICAL RESPONSES FROM THE FAR EARTHQUAKES

Э. М. Горбунова

Abstract

Study of the hydrogeological response to remote earthquakes is a separate scientific direction at the boundary of hydrogeology and geophysics. It?s necessary for understanding hydrogeomechanical processes occurring in fluid-saturated reservoirs. Spectral analysis is a convenient tool for estimation the relation between underground water level variations and ground displacement during passage of seismic waves from remote earthquakes. Water level variations can be classified as step-like, co-seismic and post-seismic changes. Different types of water level response manifest themselves in different ways in the high- and low-frequency ranges. This paper reviews water level responses to remote earthquakes (epicentral distances of more than 1800 km), that were recorded at Mikhnevo Geophysical Observatory under the platform conditions. Hydrogeological responses in the high-frequency range to seismic impact were recorded predominantly. Water level response in the low-frequency range was detected for a few events. Of greatest interest are hydrogeological responses to Wenchuan 05.05.2008 M8.0, Tohoku 11.03.2011 M9.1, Chile 02.27.2010 M8.8, and 09.16.2015 M8.3 earthquakes, which do not fit into the general pattern. For them lower values of the peak ground velocity in the low-frequency range correspond to higher values of the water level amplitudes. Such a discrepancy between the intensity of the water level changes and the ground velocity in the low-frequency range can be used for typifying of hydrogeological responses and may indicate a local change in the microstructure of the fluid-saturated reservoir.

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DOI resolver: doi.org/10.5593/sgem2019/1.2/s02.065

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