There are major fault lines in that area of the US. I don't know if schools still teach this, but for years when I was in school (back in the 80's & 90's) I remember being taught that sooner or later California would end up in the ocean (not all at once, obviously).
For California it is not a matter of IF there will be another HUGE earthquake, but WHEN. Sooner or later it will happen again and again and again. Could be months, years or decades apart - but major earthquakes will hit that area of the US.
The drill just looks like they are trying to educate people on how to survive and protect themselves whenever earthquakes hit.
Nothing to be afraid of or nervous about. Although that is easy for me to say since I'm on the other side of the country.
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