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Seismic noise spectral analysis techniques to monitor unstable rock blocksNormal access

Authors: L. Zanzi, M. Taruselli, D. Arosio, L. Longoni and M. Papini
Event name: EAGE-GSM 2nd Asia Pacific Meeting on Near Surface Geoscience and Engineering
Session: Poster Session
Publication date: 24 April 2019
DOI: 10.3997/2214-4609.201900451
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 564.68Kb )
Price: € 20

This study presents the analysis of the ambient seismic noise collected on a small limestone block that was forced to fail during a field test. We compare different spectral analysis techniques with the objective of investigating their performances and suitability to monitor the rock block stability over time. Ambient vibration datasets were first pre-processed before the spectral analysis was carried out. The outcomes clearly show a variation in spectral content when approaching rock ultimate failure, especially when considering spectrograms and horizontal-to-vertical spectral ratio curves. This agrees with the assumption that the collapse of an unstable rock is preceded by a drop of its natural frequency due to the deterioration of rock bridges. The obtained results confirm the potential of ambient noise spectral analysis as a reliable tool to improve our capabilities of rock failure forecasting.

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