BCP measures for Natural disasters

Answer:

I'm assuming that by unplanned you mean unpredictable, since that if something is unplanned then you did not devise any action to be performed, while by unpredictable some aspects of a situation are unknown (e.g., what will happen, when it will happen, the magnitude, etc.).

Considering that, and the fact that you mentioned natural disasters, bcp measures to be considered are implementing your continuity operations in a local that is far from the area hit by the event. For example if historically earth quakes have a 50km radius of impact, then your secondary operations should be in a distance longer than that. Another issue to be considered are the continuity of your supplies (e.g., regular suppliers have secondary locations or you can hire new suppliers).

These articles will provide you further explanation about BCP measures:
- Disaster recovery site – What is the ideal distance from primary site? https://advisera.com/27001academy/knowledgebase/disaster-r ecovery-site-what-is-the-ideal-distance-from-primary-site/
- ISO 22301 Case study in the travel industry: Business continuity as a necessity in customer care https://advisera.com/27001academy/blog/2016/11/07/iso-22301-case-study-in-the-travel-industry-business-continuity-as-a-necessity-in-customer-care/

These materials will also help you regarding BCP measures:
- Writing a business continuity plan according to ISO 22301 [free webinar on demand] https://advisera.com/27001academy/webinar/writing-a-business-continuity-plan-according-to-iso-22301-free-webinar-on-demand/
- Book Becoming Resilient: The Definitive Guide to ISO 22301 Implementation https://advisera.com/books/becoming-resilient-the-definitive-guide-to-iso-22301-implementation/