Research
The area of tunnel seismology is rather new. Many
problems that are encountered in tunnel seismic practice cannot be
tackled with offtheshelf 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 datadriven and may
yield to a development. For example, assume that an unknown and
undesired wavetype 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?),
wavefield 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 wavetype, 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
constantQ attenuation

new methods
for inverse Qfiltering and spectral whitening

advanced spectral estimation algorithms

automatic
velocity analysis and model building for tunnel seismology

robust imaging
methods for tunnel seismology

various
signalnoise 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

wavefield
simulation:

several finitedifference programs to compute acoustic or elastic wave propagation

new algorithm to simulate 3D
elastic wavefields around a tunnel on a single PC

Last updated January 15,
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