Fracture Network Imaging on Rock Slope Instabilities Using Resonance Mode Analysis
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Date
2019-06-28
Publication Type
Journal Article
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yes
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Abstract
We performed modal analysis using frequency domain decomposition of ambient seismic vibration data collected on large rock slope instabilities. This technique enables a robust detection of resonance frequencies and provides the corresponding mode shape vectors. We applied the technique to synthetic and field data sets acquired by seismometer arrays on two rock instabilities in Switzerland. We found that, at the fundamental mode, the entire instability vibrates in‐phase with the dominant mode shape vector oriented perpendicular to dominant fracture systems. At higher frequencies, different compartments of the instability resonate antiphase. Therefore, delineating the zero crossings between the phases allows dominant fractures to be efficiently mapped. Approximately 1 hr of ambient vibration data suffices to apply the method successfully. The method also potentially detects hidden fractures that cannot be observed by geological field mapping. In addition, this approach combines classic amplification and polarization analysis into one technique, simplifying data processing efforts.
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published
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Journal / series
Volume
46 (12)
Pages / Article No.
6497 - 6506
Publisher
American Geophysical Union
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Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
rock slope instability; ambient seismic vibrations; Frequency Domain Decomposition; Resonance frequency; operational mode analysis; fracture mappings
Organisational unit
02818 - Schweiz. Erdbebendienst (SED) / Swiss Seismological Service (SED)
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Related publications and datasets
Is cited by: http://hdl.handle.net/20.500.11850/390894
Is cited by: https://doi.org/10.3929/ethz-b-000390893