Commit 2879e29d authored by thomas.forbriger's avatar thomas.forbriger
Browse files

[WP] (i20_gremlin_example): give proper account of syg plots

parent 32630fa7
......@@ -66,7 +66,7 @@ include $(patsubst %.main.cfg,%.d,$(wildcard *.main.cfg))
-Y "phase-slowness / s km\u-1" \
-S -A "normalized magnitude"
layer.pdf: layer.fig
layer.pdf: layer.fig
fig2dev -L pdf layer.fig $@
# ======================================================================
......@@ -3,6 +3,37 @@ this is <README>
toy example for gremlin
This toy example is based on synthetic test data for a subsurface model with
one homogeneous layer on top of a halfspace. The model and its properties is
discussed by Forbriger (2001, Figure III.11 on page 88). Two versions of the
subsurface model are provide. One has the original Q values of 100 and is
indicated by 'HQ'. The other has smaller Q values (indicated by 'LQ' in file
names) which is more appropriate for field data simulation.
Vertical component data for a vertical single force (hammer blow) is computed
and gaussian white noise at an appropriate level is added. Other than in field
data, noise is completely uncorrelated. In field data noise to significant
degree consists of travelling wave with high correlation between different
reveivers. Noise is added here only for the purpose to demonstrate the effect
of tapering.
Simulated data are available in files
Plots of the data are available in files
Plots of synthetic Fourier-Bessel expansion coefficients are available in
How to control processing
Some procedures for the toy example are defined in the Makefile. They can be
run be issuing make with the appropriate target name. For example the command
......@@ -16,11 +47,27 @@ executing them actually run the command make with the '-n' flag like in
make -n layer.pdf
Seismogram file type
The default file type is SeismicUnix, with seismogram files using the
extension 'su'. Any other file type supported by the programs can be chosen by
passing a value for variable FILETYPE to make. For example
make simulationLQ.ascii FILETYPE=ascii
Standard targets are:
will produce simulated data in ASCII file format.
Standard targets
purges the directory, removes all temporary and secondary files
partly purges the directory, removes all temporary and secondary files
except seismogram files
completely purges the directory, removing seismogram files too
......@@ -8,7 +8,7 @@ Single
1200 2
2 5 0 1 0 -1 100 0 -1 0.000 0 0 -1 0 0 5
1035 1350 11830 1350 11830 8875 1035 8875 1035 1350
2 1 1 3 0 7 100 0 -1 10.000 0 1 -1 0 0 2
2700 3150 11925 3150
Control file for refmet (calculate synthetic seismograms)
Model taken from
Source taken from
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