Tsunami Sirens
Yes, but tsunamis are quite rare in California, and my point stands: the San Andreas fault is not of the type what will produce a tsunami when it ruptures.
There may be other faults far to the west, north and south that generate uplift or slumping that could create a tsunami, but I do not believe that in my lifetime a California based fault has ever caused a tsunami.
"Oh, but what about Crescent City in 1964?" you might ask.
Well, guess what? That was the result of a huge earthquake not in California, but in Alaska. My point stands: California faults do not create the kind of conditions that create tsunamis. I concur that tsunamis can be generates by fault ruptures hundreds to thousands of miles away, and those may impact the California coast. Just not from a California quake.
Similarly, the 2011 Japan quake generated a tsunami that reached California, resulting in zero deaths and a relatively paltry $40,000 in damage.
In 2018 a 7.9 quake, again in Alaska, generated tsunami warnings along the California coast, but it fizzled.
So yeah, they can happen here, but not from California-based earthquakes.
Also, the California tsunami zones tend to be located in areas where the coastline creates a lens that might concentrate and focus the wave. Like Crescent City or Santa Cruz Harbor.
[this post was last edited: 5/21/2020-14:29]
https://www.abc10.com/article/news/local/how-often-do-tsunamis-strike-in-california/103-510976740