The Finite-Frequency-Range Spectral Power – A Tool for Identification of Underground Cavities

Session: Near-Surface Effects: Advances in Site Response Estimation and Its Applications [Poster]
Type: Poster
Date: 4/28/2020
Time: 08:00 AM
Room: Ballroom
Description: 

Underground cavities pose a serious geotechnical hazard in urban development and civil construction. A cheap robust and reliable method of identifying such cavities can significantly help to mitigate the corresponding hazard. We present a new method utilizing measurements of seismic ambient noise at a discrete set of sites in an area of interest. In the first step we eliminate sections of noise recordings which include transients. In the second step we compare characteristics of noise for all stations and eliminate those stations producing strongly outlying characteristics. These two steps are implemented in an automatic procedure. Eventually, we evaluate the finite-frequency-range spectral power for each station. The obtained set of discrete values are used for interpolating a spatial map covering the area of interest. The map shows the surface location of the underground cavity. We demonstrate the capability of the method using real noise recordings at a site of the known underground cavity.

Presenting Author: Jozef Kristek

Authors