Difference between revisions of "Gplivemodel"

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''gplivemodel'' computes dispersion curves, autocorrelation curves, ellipticity curves or SH tranfert functions from a layered model. Compared to command line tools like [[Gpdc|gpdc]], [[Gpspac|gpspac]], [[Gpell|gpell]] and [[Gpsh|gpsh]], ground models can be interactively modified in a graphical user interface.
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''gplivemodel'' computes dispersion curves, autocorrelation curves, ellipticity curves or SH tranfer functions from a layered model. Compared to command line tools like [[Gpdc|gpdc]], [[Gpspac|gpspac]], [[Gpell|gpell]] and [[Gpsh|gpsh]], ground models can be interactively modified in a graphical user interface.
  
 
'''Important:''' this is not an inversion tool. Manually inverting a dispersion curve with this tool leads to an extremely poor and biased estimation of the global solution of the inversion problem. ''dinver'' is a much more appropriate inversion tool.
 
'''Important:''' this is not an inversion tool. Manually inverting a dispersion curve with this tool leads to an extremely poor and biased estimation of the global solution of the inversion problem. ''dinver'' is a much more appropriate inversion tool.
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[[Image:Gplivemodel.png|thumb|right|400px|Gplivemodel graphic interface with a background model.]]
 
[[Image:Gplivemodel.png|thumb|right|400px|Gplivemodel graphic interface with a background model.]]
  
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''gplivemodel'' graphical interface is structured in 3 panes:
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''gplivemodel'' graphical interface is structured in 3 panels:
 
* Plots of Vp and Vs profiles, and the computed curve (top of figure)
 
* Plots of Vp and Vs profiles, and the computed curve (top of figure)
 
* Model definition (bottom left of figure)
 
* Model definition (bottom left of figure)
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* Control panel (bottom right of figure)
 
* Control panel (bottom right of figure)
  
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=== Model editors ===
 
''Background models'' and ''Reference model'' are free text editors containing layered model descriptions. Model format is the same as for [[Gpdc|gpdc]], [[Gpspac|gpspac]], [[Gpell|gpell]] or [[Gpsh|gpsh]]. ''Control panel'' has a collection of sliders to control the transformation of ''Reference models'' into ''Foreground models''. A right-click on a slider lets the user [[Gplivemodel#Slider definition|editing the effects]].
 
''Background models'' and ''Reference model'' are free text editors containing layered model descriptions. Model format is the same as for [[Gpdc|gpdc]], [[Gpspac|gpspac]], [[Gpell|gpell]] or [[Gpsh|gpsh]]. ''Control panel'' has a collection of sliders to control the transformation of ''Reference models'' into ''Foreground models''. A right-click on a slider lets the user [[Gplivemodel#Slider definition|editing the effects]].
  
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Above plots (included in a [[SciFigs::Graphic sheet|graphic sheet]]) are continuously updated after any modification of ''Background models'', ''Reference models'' editors or ''Control panel''. Any number of model descriptions can be entered there. By default, axis limits are also changed. To preserve their current state, menu ''Format'' has option ''Automatic limits'' to be checked or not.
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=== Plots ===
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Above plots (included in a [[SciFigs: Graphic sheet|graphic sheet]]) are continuously updated after any modification of ''Background models'', ''Reference models'' editors or ''Control panel''. Any number of model descriptions can be entered there. By default, axis limits are also changed. To preserve their current state, menu ''Format'' has option ''Automatic limits'' to be checked or not.
  
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Attributes (color, symbols,...) of velocity profiles and computed curves can be set be editing the [[SciFigs::Legend|legends]] located on the left of the curve plot.
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Attributes (color, symbols,...) of velocity profiles and computed curves can be set be editing the [[SciFigs: Legend|legends]] located on the left of the curve plot.
  
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=== Setting curve type ===
 
''gplivemodel'' has several modes that can be activated from the command line only:
 
''gplivemodel'' has several modes that can be activated from the command line only:
 
  gplivemodel -h
 
  gplivemodel -h
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== Tutorials ==
 
== Tutorials ==
  
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* [[Gplivemodel::Dispersion curve tutorial|Dispersion curve]]
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* [[Gplivemodel: Dispersion curve tutorial|Dispersion curve]]
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* [[Gplivemodel::Autocorrelation curve tutorial|Autocorrelation curve]]
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* [[Gplivemodel: Autocorrelation curve tutorial|Autocorrelation curve]]
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* [[Gplivemodel::Ellipticity curve tutorial|Ellipticity curve]]
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* [[Gplivemodel: Ellipticity curve tutorial|Ellipticity curve]]
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* [[Gplivemodel::SH transfer function tutorial|SH transfer function]]
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* [[Gplivemodel: SH transfer function tutorial|SH transfer function]]
  
 
== Slider definition ==
 
== Slider definition ==
  
 
[[Image:controlpanel.png|thumb|right|500px|A slider to control the first layer thickness]]
 
[[Image:controlpanel.png|thumb|right|500px|A slider to control the first layer thickness]]
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[[Image:Gplivemodel dc edit.png|thumb|right|300px|Slider editor]]
  
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A slider has a ''name'' displayed on the left. This name can be edited in the same dialog box as the slider action. A slider has a value (called '''p''' for '''p'''arameter). This variable is 0 when the cursor is on the left end and 1 when it is on the right end. It can take any of the 101 discrete values between 0 and 1. Reference models are described by 4 (or 6 for SH only) vectors:
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A slider has a ''name'' displayed on the left. This name can be edited in the same dialog box as the slider action by right-clicking on slider and choosing ''Edit''. A slider has a value (called '''p''' for '''p'''arameter). This variable is 0 when the cursor is on the left end and 1 when it is on the right end. It can take any of the 101 discrete values between 0 and 1. Reference models are described by 4 (or 6 for SH only) vectors:
 
* h for thicknesses (m)
 
* h for thicknesses (m)
 
* vp for compressional wave velocities (Vp, m/s)
 
* vp for compressional wave velocities (Vp, m/s)
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It defines a slider that modifies the thickness of the first layer from 5 to 95 m.
 
It defines a slider that modifies the thickness of the first layer from 5 to 95 m.
  
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  r=h[0]*v[0];
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  r=h[0]/v[0];
 
  v[0]=100+p*300;
 
  v[0]=100+p*300;
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  h[0]=r/v[0];
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  h[0]=r*v[0];
  
 
It defines a slider that modifies the velocity keeping a constant travel time in the first layer
 
It defines a slider that modifies the velocity keeping a constant travel time in the first layer

Latest revision as of 10:56, 10 March 2010

gplivemodel computes dispersion curves, autocorrelation curves, ellipticity curves or SH tranfer functions from a layered model. Compared to command line tools like gpdc, gpspac, gpell and gpsh, ground models can be interactively modified in a graphical user interface.

Important: this is not an inversion tool. Manually inverting a dispersion curve with this tool leads to an extremely poor and biased estimation of the global solution of the inversion problem. dinver is a much more appropriate inversion tool.

Description

Gplivemodel graphic interface with a background model.

gplivemodel graphical interface is structured in 3 panels:

  • Plots of Vp and Vs profiles, and the computed curve (top of figure)
  • Model definition (bottom left of figure)
    • Background models
    • Reference model
    • Foreground model
  • Control panel (bottom right of figure)

Model editors

Background models and Reference model are free text editors containing layered model descriptions. Model format is the same as for gpdc, gpspac, gpell or gpsh. Control panel has a collection of sliders to control the transformation of Reference models into Foreground models. A right-click on a slider lets the user editing the effects.

Plots

Above plots (included in a graphic sheet) are continuously updated after any modification of Background models, Reference models editors or Control panel. Any number of model descriptions can be entered there. By default, axis limits are also changed. To preserve their current state, menu Format has option Automatic limits to be checked or not.

Attributes (color, symbols,...) of velocity profiles and computed curves can be set be editing the legends located on the left of the curve plot.

Setting curve type

gplivemodel has several modes that can be activated from the command line only: 

gplivemodel -h
[...]
Curve type options:
  -disp                     Sets to dipersion curve mode (default)
  -disp-grid                Set to dipersion grid mode
  -ell                      Sets to ellipticity curve mode
  -sh                       Sets to Sh amplification curve mode

Tutorials

Slider definition

A slider to control the first layer thickness
Slider editor

A slider has a name displayed on the left. This name can be edited in the same dialog box as the slider action by right-clicking on slider and choosing Edit. A slider has a value (called p for parameter). This variable is 0 when the cursor is on the left end and 1 when it is on the right end. It can take any of the 101 discrete values between 0 and 1. Reference models are described by 4 (or 6 for SH only) vectors:

  • h for thicknesses (m)
  • vp for compressional wave velocities (Vp, m/s)
  • vs for shear wave velocities (Vs. m/s)
  • rho for densities (kg/m3)
  • Qp for compressional wave attenuation factors
  • Qs for shear wave attenuation factors

n is a constant containing the number of layers.

Any value of these vectors can be changed by any number of formulas. 

h[0]=5+p*95;

It defines a slider that modifies the thickness of the first layer from 5 to 95 m. 

r=h[0]/v[0];
v[0]=100+p*300;
h[0]=r*v[0];

It defines a slider that modifies the velocity keeping a constant travel time in the first layer

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