I have been asked to prepare a seismic design guideline for subsea structures (piles, pipelines, gravity base structures)
Are there any available references that I can start with? I have checked API and DNV and found nothing.
i believe it does have some. do a few searches on the "earthquake engineering online archive" and read the abstracts to see if it has something along the lines of what you're looking for. if you don't see anything jump out at you, then maybe it doesn't have exactly what you need...but i have seen a few things related to the ocean.
try "ocean structure" and "sea structure" and "ocean".
try also the asce database: