Angle Mutes are located under the Mutes tab of the control panel
Select the blue plus symbol to create a new angle mute
and give the mute a name
I have some offset gathers here
I'll need to choose a velocity model for
calculating the angle through the gather
Select the velocity volume from the drop down
and check the velocity type is set correctly
If I was using a high resolution velocity model
I could apply smoothing before calculating the mute
using the smoothing length
As soon as I specify an outer angle
the mute appears as a dashed line on each gather
The mute updates automatically
when you change the settings
This makes it easy to find the right angle for the gathers
By setting both an inner and outer angle
a single mute can mute values outside the range
If only the outer angle is defined
the inner angle defaults to zero
To see the paths of several angles, use multiple mutes
Here I have a mute every 10 degrees
starting at 5
15
25
35
45
and 55
It is ok to use the same inner and outer angles
as I have done here
This trick provides flexibility when
applying the mutes in processes
As expected, the mute offsets increase with travel time
That big change at 2000 ms is interesting
it would be good to see the velocity causing it
By selecting a group containing the velocity and the offset gathers
I can see a velocity inversion affecting the ray paths
The mute gathers process trims samples from a gather outside the mute
After selecting the mute gathers process
select the gathers volume
Select the inner and outer mutes
This could be a single mute with different inner and outer angles
or two mutes each with a single value
This is where my mutes with matched inner and
outer angles provide flexibility
The Angle Mute has different inner and outer angles set
The gathers update immediately when I
change the mute angles to 15 and 25
I could create a mid stack directly from these
muted gathers using a stacking process
After selecting the stacking process
select the muted gathers volume
Here's the mid stack result
Another approach is to select the mutes
directly in the stacking process
I'll choose the unmuted gathers
then select inner and outer mutes at 5
and 35 degrees
The stack now shows the result from the updated mute settings
This is a typical full stack
Looking at the full stack muted gathers in the deeper section
that 5 degree inner mute
may be trimming more of the
near gather traces than we would like
If I set a "maximum offset" value at 250 m
the mute is applied at 5 degrees
or 250m, whichever is lower
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