EasyRefract is the new software from GeoStru dedicated to the
interpretation of seismic refraction tests using the reciprocal method and the
generalized reciprocal method (G.R.M.).
The definition of the stringing profile is
extremely flexible and
does not impose constraints
on the number of blows to be
used in the analysis.
The software is able to guide the user through the analysis phases offering the
full control of the operative process.
The
program has implemented an
efficient tracking system that
allows editing the aerial photo
of the research area.
Field data
is
extracted directly from the files
generated by
loggers (in formats like SEG2, SEGY, SU, etc.)
and plotted
to give the user the identification
of the early arrivals,
that can also be entered manually or
by copy/paste.
As a function of the identification
of the first arrivals, the
software is able to operate the
regression analysis and identify the time travel graph.
Through this analysis phase
arrival times are assigned to the
correct refractors.
After building the
time travel graph
and having identified the propagation
speed of the seismic signal in the
different layers of the soil,
the Generalized Reciprocal Method is applied.
This method is based on the research, in the time-distance diagram, of an
optimal distance between geophones XY, in such way that the seismic rays coming
from opposing
energization points,
positioned in a symmetrical manner
at the ends of the
stringing, arrive from the same point of the refractor on the
geophones placed in X and Y.
In addition to performing an automatic search of the optimal XY, EasyRefract
provides, for the eligible values XY, the graph of velocity function with
the standard deviation for each associated regression and the
graph of the time-depth function with the
roughness value.