The area of tunnel seismology is rather new. Many problems that are encountered in tunnel seismic practice cannot be tackled with off-the-shelf measures. Instead they require to do research to better understand the problem at hand and to find a proper solution. Usually, the approach at Tunnelseis is data-driven and may yield to a development. For example, assume that an unknown and undesired wave-type appears in a tunnel seismic record. Our typical research sequence may comprise a thorough investigation of the particular seismic event, theoretical considerations (on its possible origin), study of the literature (is the wave known in other fields?), wave-field modelling, development of a new algorithm to suppress the wave, its implementation and the test on real and synthetic data. The analysis may also result in a recommendation, how to avoid the excitation of that particular wave-type, for example by a redesign of the source.
Some examples of research conducted at Tunnelseis may shed light on our foci of interest and our capabilities

  • rock physics:

  • derive seismic velocities and densities from seismic records

  • derive ground porosity and absorption properties from seismograms

  • assess rock quality from seismic data

  • digital signal processing and seismic processing algorithms:

  • new methods to estimate constant-Q attenuation

  • new methods for inverse Q-filtering and spectral whitening

  • advanced spectral estimation algorithms

  • automatic velocity analysis and model building for tunnel seismology

  • robust imaging methods for tunnel seismology

  • various signal-noise ratio improvement filters

  • various filter procedures to enhance vibroseis data prior to crosscorrelation

  • new methods to remove specified undesired signals

  • automation:

  • completely automated seismic acquisition, processing and imaging

  • efficient scripting for processing of large amounts of data

  • image processing:

  • enhancement of coherent energy

  • automatic extraction of significant reflectors and of reflector properties

  • computation of many seismic attributes

  • wave-field simulation:

  • several finite-difference programs to compute acoustic or elastic wave propagation

  • new algorithm to simulate 3-D elastic wave-fields around a tunnel on a single PC

Last updated January 15, 2010. © 2006, Tunnelseis. All rights reserved.