Phone just went off screaming with a warning here in NZ - more a "stay away from the water" warning than a "head for the hills" one

Impressive, glad the alarm chain works. And from what you say the warning message is also clear and understandable. Not tech or geology jargon that people don't understand and then take no or the wrong actions.

It will arrive in California in the middle of the night. Hope they don’t materialize.