Topic:
Why does my time slice display in only one color when the seismic displays fine?

Description:

Solution:
The time slice is displaying only one color because there is a spike in
the data.  The time slice posting uses the survey RMS values and scales the
plot to these values.  If there is a spike, it will only display one color.

At the end of this section you will find a way to locate multiple spikes in a
	survey.  Here is an easier way to find a single bad sample.
1.) Go to Data Manager/seismic_report.
2.) Select the desired survey and class, then select amplitude statistics 
	reporp.
3.) Press the report button.  The line and cdp number of the traces with the
	maximum and minimum (signed) amplitude is listed about 20 lines down.

See FAQ for data manager for "How can I replace a  bad trace??"


1) Find the spike in the data: Session Manager > Computation Manager
	a. Click the 'Survey button' and select the survey, input class of data
	   and enter a class name at the bottom of the menu (leave the line and
	   the cdp range to cover the full extent of the survey) and click 'OK'.
	b. Select the 'Mappable Seismic Statistice' operation.  Within the list
	   of available statistics, select the Maximum amplitude and the RMS
	   amplitude.
	c. Display both statistics in Basemap: Session Manager > Application
	   > Interpretation > Basemap.  When in Basemap, Post > Interpretation.
           Select the survey, the 'linevolume_stat' horizon
	   and the attribute.  Click the 'Apply' button to display in the
	   Basemap.  From the display you can determine the trace(s) with the
	   anomolous amplitude value.

2) Delete the spike in the data: Session Manager > Application > DataManager
> Seismic > Copy.  Select the survey and class of data and set the 'Option'
toggle to 'Null data' (you do not select an output class).  Click on the 
'Change Area' button and set it to the trace(s) which contained the anomolous
amplitude value.  Click on the 'Generate' button.

Note: Be very careful when running the 'Null data' option in step 2 above as it
will null out seismic data.  Many times, people will opt to make a copy of 
their data volume prior to running the null data option.



Last Modified on: 30-OCT-98