This　study　develops　a　framework　to　perform　integrated　analysis　for　the　seismic　response　of　offshore　wind　turbines　(OWTs).　The　ground　motions　are　introduced　in　the　analysis　as　depth-varying　excitations　that　are　obtained　from　free-field　site　response　analysis　involving　equivalent　linearization　approach.　The　calculated　accelerations　at　different　elevations　are　used　in　a　beam　on　nonlinear　Winkler　foundation　model,　which　is　then　used　to　simulate　the　pile-soil　interaction　(PSI).　These　models　are　combined　with　the　FAST　code　to　develop　an　integrated　seismic　response　analysis　framework　(SRAF)　for　the　system　consisting　of　OWT,　along　with　one-dimensional　site　response　analysis　and　PSI　elements.　Considering　the　NREL　5　MW　OWT　as　an　example,　the　reliability　of　SRAF　is　validated　by　comparisons　with　simulation　results　obtained　from　GL-Bladed　and　ADINA　software.　Subsequently,　the　validated　model　was　used　to　investigate　the　influence　of　three　earthquake　excitation　models　on　the　seismic　response　of　OWTs.　We　found　that　the　uniform　earthquake　excitation　method　significantly　underestimates　the　seismic　response　of　OWT.　In　addition,　the　validated　model　was　used　to　evaluate　the　seismic　responses　of　OWTs　under　different　operational　conditions.　The　results　indicate　that　the　seismic　responses　of　OWTs　differ　significantly　under　running,　parked　and　emergency　shutdown　states.