Abstract
Strong motion earthquakes with a magnitude of up to M s =6.2 have occurred over the past 200 years on the Fennoscandican plate containing Norway and its continental shelf. Considerable effort has been focused recently on assessing the seismic hazard in this intraplate region for purposes of designing offshore structures. This paper presents an approach for specifying the earthquake loading in the design of offshore platforms for the Norwegian continental shelf, consistent with the geology and sesmic hazard at the site of interest. This problem is complicated by the fact that there are few, if any, records of actual earthquake ground motions from such intraplate regions. Particular emphasis is placed on (1) the selection and use of appropriate strong motion earthquake time histories recorded during past events, and (2) the reliable processing of the recorded time histories; this is of special importance for deep water offshore structures with natural period in the high period range (4–7.5s).
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