Today's Story about the "ArcStorm"

https://ktla.com/2019/02/18/rare-mega-storm-in-l-a-area-could-cause-3-times-as-much-damage-as-major-earthquake/

Same story from 2010 from the Gov.

https://pubs.usgs.gov/of/2010/1312/

They happen once every 200 years? Then why is it happening 9 years later? Did it happen in 2010? [FF]?