(a) Determination of existence of major disaster. Solely for purposes of this Rule, the Supreme Court shall determine when an emergency affecting the justice system, as a result of a natural or other major disaster, has occurred in:
(1) this jurisdiction and whether the emergency caused by the major disaster affects the entirety or only a part of this jurisdiction, or
(2) another jurisdiction but only after such a determination and its geographical scope have been made by the highest court of that jurisdiction. The authority to engage in the temporary practice of law in this jurisdiction pursuant to paragraph (c) shall extend only to lawyers who principally practice in the area of such other jurisdiction determined to have suffered a major disaster causing an