It's also worth noting that, in the case of the Fukushima accident, all nuclear reactors shutdown correctly when the earthquake was detected, before it reached the plants. All of them, including the affected plant, shutdown as designed. Then the tsunami came and created a bunch of issues (lots of vital equipment at ground level, generator trucks came and were incompatible, yada yada yada).

Japan has a great early warning system for both earthquakes and tsunamis that has been in operation for quite a while now(since 2007?)

https://www.youtube.com/watch?v=lAxxZkpV0HI&t=62s