You know I had a thought (dangerous I know) . When they calculate how destructive an earthquake is I believe they go on how many lives it has claimed first, before damage & cost, also in that cost would be the psychological trauma for those still alive.
So if we go from say the last 100 years you would be looking at a 9 possibly a full 10. We shouldn't calculate something like a cult on our own experiences but should take into account everyone involved.