Seismology and Tsunami Research Department
Meteorological Research Institute(MRI) > Seismology and Tsunami Research Department > MICAP-G > Usage of MICAP-G

Usage of MICAP-G

MICAP-G

This page shows an example of crustal deformation calculation without a map. Start the MICAP-G program in Windows. The main window will appear.

Map parameters (Drawing without a map)

If a map is shown in the main window, click [Parameters] [Map]. The [Map Parameters] box shown below will appear. Uncheck the box in the top left and click [OK]. If no map is shown in the main window, this step can be omitted.



Source parameters

Click [Parameters] [Source] to set the source parameters. The [Source Parameters] box shown below will appear. Point sources can be calculated for crustal deformation caused by rectangular faults or dike intrusion, and multiple sources are supported.< This page shows an example with a simple rectangular fault. First, select [Single Fault] from the [Source] drop-down box and input the desired values for [Dislocation]. [Slip] is the amount of slip on the fault, [Rake Angle] is the rake angle of the fault measured counterclockwise from the fault strike, [Tensile] is the fault’s amount of tensile with expansion represented as positive values, [Width] is the width of the fault, [Dip Angle] is the dip angle of the fault measured from the horizontal, and [Depth of the fault top] is the depth of the fault top.

Next, set the strike angle and the length of the fault. Values can be input for [Edge 0] (the start point of the fault top) and [Edge 1] (the end point of the fault top) under [Location of Fault Edges], but mouse-based input is shown here. Click on the mouse button under [Assistant] to close the [Source Parameters] box and leave only the main window on display. The coordinates of the first click become [Edge 0], and those of the second click become [Edge 1].

Calculation of crustal deformation

MICAP-G can calculate and draw the following physical quantity.

Contour Displacement
delta CFF
Dilatant Strain
Volumetric Strain
Shear strain
Each component of strain tensor
Vector Horizontal Displacement
Tilt
Principal strains

Click [Execute] in the menu bar and select [Commands].

Click [Execute] menu and select commands.

This page shows the contours of the displacement Z.

Illustration coarseness can be adjusted under [No. of Grid] in the [Field Parameters] box.

The contour interval and vector scale can be adjusted in the [Visual Parameters] box, and Delta CFF can be adjusted in the [CFF Parameters] box.




Text output for calculated crustal deformation

Calculated crustal deformation values can be output. Select [File] [Store Strains].

[Option][Tool] output
Nine Strain Components displacement (X, Y, Z, unit mm)
strain(xx, yx, zx, yx, yy, yz, zx, zy, zz, unit 10-6)
Diatant, Volumetric and
maximum Shear Starain, delta_CFF
dilatant strain
volume strain
maximum shear strain
delta CFF

last update : 2014-06-16
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