Nanoseismic monitoring of shallow caverns for detection of incipient failures

M. Tsesarsky, G. H. Wust-Bloch

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Nano-seismic Monitoring (NM) techniques can be used to detect extremely low signals (ML >-4.0) generated by active subsurface instabilities around shallow cavities. The data is acquired by portable sparse seismic arrays, which are deployed as close as possible to a presumed zone of instability. Events detection is carried out by semi-automated pattern recognition-supported schemes that scan for broad-band energy spikes within continuous data records sampled at 200 to 500 Hz. The authenticity of source signals is verified by true-scale simulation in the field. Comprehensive waveform characterization process includes full-spectral analysis, 3-D source location, waveform cross correlation and source magnitude evaluation. In this paper, we present the application of NM techniques to the detection of incipient instabilities around shallow caverns excavated in soft and homogenous chalk. We present laboratory results, field calibration and field monitoring data of both active and inactive failure processes.

Original languageEnglish
Title of host publicationHarmonising Rock Engineering and the Environment - Proceedings of the 12th ISRM International Congress on Rock Mechanics
Pages1137-1139
Number of pages3
StatePublished - 13 Feb 2012
Event12th International Congress on Rock Mechanics of the International Society for Rock Mechanics, ISRM 2011 - Beijing, China
Duration: 18 Oct 201121 Oct 2011

Publication series

NameHarmonising Rock Engineering and the Environment - Proceedings of the 12th ISRM International Congress on Rock Mechanics

Conference

Conference12th International Congress on Rock Mechanics of the International Society for Rock Mechanics, ISRM 2011
Country/TerritoryChina
CityBeijing
Period18/10/1121/10/11

Keywords

  • Field measurements
  • Monitoring
  • Rock caverns
  • Stability analysis
  • Weak rock

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