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Comparison of Reflection Seismic Data with Seismic Tomography in an Underground Environment
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 1st Conference on Geophysics for Infrastructure Planning Monitoring and BIM, Sep 2019, Volume 2019, p.1 - 5
Abstract
Site investigations ahead of the tunnel face by means of geophysical methods are increasingly becoming an essential part of the risk management process for the last 20 years. Seismic methods have established as the frontrunner offering a wide range of data acquisition techniques, data processing types and result visualization tools. Continuous seismic measurements look for optimising both data acquisition process as part of the operative work flow while tunnelling and the rapidness in providing reliable geological predictions for the next tens of meters ahead of the face. To cope with the scenario that no explosives are available, the use of an alternative impact source together with continuous measurements is foreseen. By comparing TSP reflection seismic results of a sporadic measurement with results of high resolution seismic tomography in a test gallery, important insights about the penetration depth and resolution of the TSP results was possible. In the shown example, reliable results were obtained until about 50 meters away from the seismic layout.