Land / Property after Natural Disaster(s)

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Very vague question. However, I am curious on you guys' thoughts about the value of land and properties after a natural disaster - tornado and/or hurricane. 

I am forward thinking to see if this a potential buying opportunity to potentially purchase the land to build duplexes on, etc? 

 The area in general is a nice area. I am thinking similar to vacant properties, etc., if it would be a good idea to cold call the land owners to see what their plan is and/if they would be interest to sell their land or property. Ultimately, I am unsure if natural disaster's hurt the value of the land? I can assume it definitely would to a damaged home, however, I am unsure how much. I had this thought and figured it would be best to say aloud to my BP community.

I am not opposed to any constructive criticism. So please answer, all answers are welcomed! If I need to clarify anything, please advise. 

Thanks in advance BP community!