Oregon Revised Statutes Elections § 249.005

(1) Notwithstanding ORS 249.008 and 249.875, a petition or minutes for which original signatures are otherwise required may be accepted by the county clerk for signature verification, or by another filing officer in the case of a recall petition, with photographic copies of one or more signature sheets if:

(2) As used in this section, “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.