Commit a29e4932 authored by thomas.forbriger's avatar thomas.forbriger

[TASK] (issue5lisousi): rework README

parent 773e98cb
......@@ -9,7 +9,7 @@ Purpose of lisousi
Line-source simulation: Transform field data to apparent line-source generated
waveforms in preparation for Cartesian 2D full-waveform inversion.
Shallow seismic field data is excited by point sources (e.g. hammer blows).
Seismic field data is excited by point sources (e.g. hammer blows).
Full waveform inversion (FWI) approaches which make use of Cartesian 2D
forward modeling implicitly use a line source to fit the observed data.
Therefore recorded waveforms must be transformed to simulate equivalent
......@@ -27,14 +27,6 @@ approximations, most of them being derived from the acoustic wave Green's
function. Nevertheless, they perform surprisingly well on data from
visco-elastic wave propagation in heterogeneous structures.
For shallow seismic data we recommend a simple but effective procedure:
1. scale waveform by r*sqrt(2) (offset times square root of 2)
2. convolve with 1/sqrt(t) (fractional half integration)
3. taper samples with 1/sqrt(t)
Where r is source-to-receiver offset and t is sample time.
Features
--------
......@@ -73,9 +65,9 @@ Program documentation
See files
usage_text.txt
help_text.txt
description_text.txt
usage_text.txt for a summary of command line options
help_text.txt for a description of command line options
description_text.txt for the theory of operation
for usage information or execute
......@@ -127,7 +119,7 @@ Dependencies:
============================================================================
The home of this software suite is
http://gpitrsvn.gpi.uni-karlsruhe.de:8000/TFSoftware/wiki/trunk/src/ts/lisousi
https://git.scc.kit.edu/Seitosh/Seitosh/wikis/src/ts/lisousi/lisousi
Please send bug reports and suggestions to
Thomas.Forbriger@kit.edu
......
......@@ -9,7 +9,7 @@ Purpose of lisousi
Line-source simulation: Transform field data to apparent line-source generated
waveforms in preparation for Cartesian 2D full-waveform inversion.
Shallow seismic field data is excited by point sources (e.g. hammer blows).
Seismic field data is excited by point sources (e.g. hammer blows).
Full waveform inversion (FWI) approaches which make use of Cartesian 2D
forward modeling implicitly use a line source to fit the observed data.
Therefore recorded waveforms must be transformed to simulate equivalent
......@@ -27,6 +27,15 @@ approximations, most of them being derived from the acoustic wave Green's
function. Nevertheless, they perform surprisingly well on data from
visco-elastic wave propagation in heterogeneous structures.
For shallow seismic data we recommend a simple but effective procedure:
1. scale waveform by r*sqrt(2) (offset times square root of 2)
2. convolve with 1/sqrt(t) (fractional half integration)
3. taper samples with 1/sqrt(t)
Where r is source-to-receiver offset and t is sample time.
We call this "direct-wave transformation".
Theory of operation
===================
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment