Zall,
The comments above are correct for the buried piping stress analysis. You have not defined the code that you are using this application, but ALA guidance is the best source for your application in addition to the CAESAR II reference within ASME B31.1 for modelling. You will find the short-cut to the ALA reference.
https://www.americanlifelinesalliance.com/pdf/Update061305.pdfAs Dorin has explained the ALA guideline gives you how to apply the seismic force as a thermal load. In addition to this you need to read the modelling issues within the CAESAR II guides, it is different from the aboveground piping model. You may have to increase the nodes at certain locations to be able to see the behaviour of the piping.
The more you read guidelines on the issue you will have more question in mind. Fault lines are going to be an issue if you are dealing with long distance pipeline. They may need special attention.
It seems that you are a beginner for the buried piping analysis, I wish you passion and good luck.
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