Applying gravity as "body force" in Explicit step in Abaqus

[kumara123]

Hello,
I am working with Abaqus Explicit to simulate ground wave propagation. Before applying dynamic step I want to establish initial in-situ stress of the soil. Can I use the explicit step to input gravity as a body force to the model? If I use a geostatic step, I can not use the explicit step for dynamic loading. How to include in-situ stress keeping dynamic explicit step? Can anyone help me with this.
Thank You,,