I think you will need to think it through more. Natural disasters taking 100 lives happen regularly in 3rd world countries. Just wait until the next hurricaine or big flood. What I assume you are looking for is something really big like 10,000 lives. If the target is next event, then all you will get is a bunch of people dying, bu tit won't necesarily tell you where or when. Rv is unreliable with exact locations and exact dates.
Might be better to consider a specific location, say your hometown, and then look at stepped increments of time. Or look at stock market movements and then investigate causes of those. Anyway you look at it, because of the weaknesses of rv and the nature of what it is and is not good at, this would be a big project requiring organization, skilled viewers, skilled tasking, skilled analysis, and plenty of work. Maybe that is why others who have attempted it in the past have mostly all screwed it up and made rv look like a laughing stock! ;-)