Read about history and pick out a good one:
https://en.wikipedia.org/wiki/May_30
1948 – A dike along the flooding Columbia River breaks, obliterating Vanport, Oregon within minutes. Fifteen people die and tens of thousands are left homeless.
1998 – The 6.5 Mw Afghanistan earthquake shook the Takhar Province of northern Afghanistan with a maximum Mercalli intensity of VII (Very strong), killing around 4,000–4,500.