Abnormal Level Earthquake

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Definition(s)

Abnormal Level Earthquake

Intense earthquake of abnormal severity under the action of which the structure should not suffer complete loss of integrity.

NOTE: The ALE event is comparable to the abnormal event in the design of fixed structures which are described in API 2A-WSD and ISO 19903. When exposed to the ALE, a manned structure is supposed to maintain structural and/or floatation integrity for a sufficient period of time to enable evacuation to take place.

Source:API RP 2EQ, Seismic Design Procedures and Criteria for Offshore Structures, First Edition, November 2014. Global Standards

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