act of God
(1) “act of God” means an unanticipated grave natural disaster or other natural phenomenon of an exceptional, inevitable, and irresistible character the effects of which could not have been prevented or avoided by the exercise of due care or foresight;
Source
33 USC § 2701(1)
Scoping language
None identified, default scope is assumed to be the parent (subchapter I) of this section.