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In-situ Acoustic Emission Monitoring: Seismic signals mapping the formation of damage underground

In-situ Acoustic Emission Monitoring: Seismic signals mapping the formation of damage underground
Datum:

04.12.2018

Referent:

Dr. Katrin Plenkers (GMUG)

Abstract

In between microseismicity studies and laboratory studies damage in rock is examined by In-situ Acoustic Emission Monitoring. Hereby seismic signals with frequencies from ~1000 Hz to ~150.000 Hz are recorded. These signals are emitted by seismic events that correspond to fractures on mm-, cm- or dm-scale (Magnitudes approx. -6 < M < 0). Most often In-Situ AE Monitoring is implemented for large-scale experiments in underground laboratories addressing questions like earthquake nucleation,  hydro-fracturing or nuclear waste disposal or the technology is used for structural health monitoring e.g. in mines.
In this talk recent advances in AE waveform analysis are presented including source studies and the analysis of secondary wave phases. One focus of this talk is ongoing earthquake nucleation and rockburst research in Deep South African Mines. In addition an overview about the technology is presented with examples of recent In-situ experiments in different geological settings.