71 Pa. Stat. § 779.2
Because of the existing possibility of attack upon the United States of unprecedented size and destructiveness, and in order, in the event of such an attack, to assure continuity of government through legally constituted leadership, authority and responsibility in offices of the government of the Commonwealth and its political subdivisions, to provide for the effective operation of government during an emergency, and to facilitate the early resumption of functions temporarily suspended, it is found and declared to be necessary to provide for additional officers who can exercise the powers and discharge the duties of Governor; to provide for emergency interim succession to government offices of this Commonwealth and its political subdivisions in the event the incumbents thereof (and their deputies, assistants or other subordinate officers authorized, pursuant to law, to exercise all of the powers and discharge the duties of such offices (hereinafter referred to as deputies) are unavailable to perform the duties and functions of such offices; and to provide for special emergency judges who can exercise the powers and discharge the duties of judicial offices in the event regular judges are unavailable.
71 P.S. § 779.2