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Application of Passive Seismics for Investigation of Karst Phenomena in the Historic Center of Kazan
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Engineering and Mining Geophysics 2021, Apr 2021, Volume 2021, p.1 - 10
Abstract
Geophysical investigation of the ground conditions to a significant depth is rather complicated in urban environment. For one thing, it is often impossible to set up the seismic and geoelectrical arrays of sufficient length. The next problem is the high level of seismic and electromagnetic noise. This is why the karst investigations carried out at the small block, located in the historic center of Kazan city were based on geophysical data, obtained with various passive seismic techniques: Horizontal-to-Vertical Spectral Ratio methodology (HVSR), Multichannel Analysis of Surface Waves and Microtremors (MASW, MAM). Supplemented by drilling results, the HVSR methodology provided structural information for the subsurface, while MASW and MAM showed soil physical properties and their variations.