The growth of the offshore industry into newer regions - including seismic regions - requires a detailed understanding of theearthquake design of offshore platforms. Guidance is provided in ISO 19901-2, "Petroleum and natural gas industries,Specific requirements for offshore structures, Seismic design procedures and criteria.” This was adopted almost in it'sentirely by API in 2013 in the form of API RP2EQ, "Seismic Design Procedures and Criteria for Offshore Structures." Thispaper provides supplemental information to these ISO and API standards with the intent to provide additional guidance toengineers analyzing and designing platforms in earthquake regions. The guidance is based on practical application of thesestandards over the past few years on platforms located in different worldwide regions. Issues discussed include: historicaldevelopment of seismic guidelines; the importance of ductility in a platform design; Pushover and Time History analysisprocedures; definitions of platform collapse; and, pre-planning for post-earthquake actions.
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