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<< Click to Display Table of Contents >> Interferometry - Displacement Modeling - CFF Stress Transfer |
  
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<< Click to Display Table of Contents >> Interferometry - Displacement Modeling - CFF Stress Transfer |
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This panels is used to calculate the stress transfer between sources adopting the Coulomb Failure Function.
An example involving this panel can be found in the tutorial.
Technical Note
This panel allows to calculate the stress variation induced into a source, called “receiver”, by the dislocation or opening of one or more input sources. Input and receiver source(s) can be a whatever combination of Elastic dislocation and Point pressure sources. The calculation is based on the Coulomb Failure Function [Harris, 1998] and it can be done with the simple friction coefficient (Classical Formulation), or with the additional Skempton's coefficient (Undrained Formulation), varying from 0, dry soil, to 1, fully saturated soil, according to:
ΔCFF = Δτ+μ ·(Δσ - β·T/3)
where Δτ is the shear stress variation, μ is the friction coefficient, Δσ is the normal stress change, β is the Skempton's coefficient and T is the stress tensor trace.
Input and receiver sources are retrieved and stored in the XML Project File.
The INPUT Sources folder allows to create, recover and setup the sources used as input for the stress calculation. Two sources are available: Elastic dislocationsource, used to model the surface displacement induced by a dislocation over a source in an elastic and homogeneous half-space [Okada, 1985]; Point pressure used to model the surface displacement induced by an expanding or compressing point-source [Mogi, 1958]. Use "EDIT SOURCES – Edit parameters..." button to set the source parameter.
The Receiver Sources folder allows to create, recover and setup the sources on which the stress change is calculated.
The CFF Options folder allows to set the algorithm to use for the calculation: classic formulation or undreained formulation, possibility of masking mathematical singularities and allow the output of the whole tensor.
Note: in this panel the use of the XML Project File is mandatory.
INPUT Sources
ADD SOURCES
New
Elastic Dislocation (Okada): open the panel to set the parameters of an elastic dislocation/opening
Point Pressure (Mogi): open the panel to set the parameters of a point volume source
Import
From Shapefile: add a source from an InSAR or GPS shapefile
From XML Project File…: retrieve a source from an existing XML Project File
| From Global-CMT catalog…: open a panel to initialize the source parameters from the ID of an event from the Global CMT catalog (https://www.globalcmt.org/CMTsearch.html) |
| From USGS waveform inversion finite fault…: open a panel to create a source from the slip distribution provided by USGS and based on the waveform inversion (a link or a *.param file can be supplied) |
EDIT SOURCES
Edit parameters…: set the source properties through an ad hoc panel
Remove: remove the selected source(s) from the list
VIEW SOURCES
Plot 2D: open a Graphic Viewer to see the source in a geocoded map
Plot 3D: open a Graphic Viewer to see the source in a 3D geocoded map;
EXPORT SOURCES
Save to shapefile…: allow the user to save the sources in a shapefile
Receiver Sources
ADD SOURCES
New
Elastic Dislocation (Okada): open the panel to set the parameters of an elastic dislocation/opening
Point Pressure (Mogi): open the panel to set the parameters of a point volume source
Import
From Shapefile: add a source from an InSAR or GPS shapefile
From XML Project File…: retrieve a source from an existing XML Project File
| From Global-CMT catalog…: open a panel to initialize the source parameters from the ID of an event from the Global CMT catalog (https://www.globalcmt.org/CMTsearch.html) |
| From USGS waveform inversion finite fault…: open a panel to create a source from the slip distribution provided by USGS and based on the waveform inversion (a link or a *.param file can be supplied) |
EDIT SOURCES
Edit parameters…: set the source properties through an source dependent panel
Remove: remove the selected source(s) from the list
VIEW SOURCES
Plot 2D: open a Graphic Viewer to see the source in a geocoded map
Options
Standard Formulation
Friction Coefficient
Sliding friction coefficient (see Technical Note).
Undrained Formulation
Friction Coefficient
Sliding friction coefficient (see Technical Note).
Skempton's Coefficient
Skempton's Coefficient (see Technical Note).
Mask singularities at the input source proximity
Check this flag to avoid the mathematical artefacts that can arise when the distance between the source and the receiver is too small.
Output all tensor components
By setting this flag, the output source will contain within its attributes all the tensor components
XML Project File section
New...
Create a new XML Project File content into the panel.
Open...
Open the XML Project File content into the panel.
Save
Save the XML Project File content from the panel.
Save as...
Save the XML Project File content from the panel defining the project name.
Close
Close the XML Project File content from the panel.
General Functions
Start
Start of the processing.
Cancel
The window will be closed.
Help
Specific help document section.
References
Harris, R. A. (1998), Introduction to special section: Stress trigger, stress shadows, and implication for seismic hazard, J. Geophys. Res., 103(B10), 24,347–24,358, doi:10.1029/98JB01576.