This command is used to offset the grid values of an existing
strata elevation grid file to adjust for faults. The program saves
a new grid file with the values offset based on the fault lines
drawn with the Draw Fault Line command. There are two methods. The
Separate Grids For Each Side of Fault method applies for both
regular faults and reverse faults where the strata are folded over
top of themselves within the fault zone. In both cases, the strata
can be modeled separately for each side of the fault. The Adjust
Grid Across Fault applies when the strata can be modeled with the
same grid for the whole site. This method adjusts the grid in the
fault zone.
Before running Apply Faults to Grid for this method, setup the
faults and strata grids as follows:
1. Draw a fault polyline with the dip angle and elevation
difference set using the Draw Fault Line command.
2. Draw a closed polyline around the area on the high side of the
fault.
3. Create strata grids like usual. Make separate strata grids for
the high and low sides.
4. Create a surface topo grid (only necessary for reverse
faults)
When using this method, you will be prompted with the below
dialog
Reverse Fault: Folded
With this method, the program prompts for the fault polyline and
high side polyline from steps 1,2 and the grids from steps 3,4. The
processing for the high side strata grids is slightly different
than the low side because the way the program goes about embedding
the fault surface to the strata surfaces. For the high side, you
specify one strata grid at a time. For the low side, you specify
the top and bottom strata grids (ie A1_TOP.grd and A1_KEY.grd).
Continuous Strata Surface
With this method the
program prompts for the fault polyline, the high side inclusion
polyline, and the high/low-side grids (no topo is needed). This
will join the two grids and the fault surface into a single grid
file as shown below.
The Fault Influence Distance is the offset distance away from
the fault lines that will be used to transition from the original
grid to the faulted values.
This is the grid before applying the
faults
This is the grid after applying the faults
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