* Where time and conditions permit, move your boat out to
sea to a depth of at least 180 feet.
* If at sea avoid entering shallow water, harbors,
marinas, bays, and inlets to avoid floating and
submerged debris and strong currents.
typically, yes. Tsunamis are usually unnoticeable away from the shore. They aren't like a massive, traveling, cresting wave. They are usually a pulse of high energy that can move a lot of water just a few feet, which can be devastating when it reaches the shore because it is relentless as it moves up to that height.
Presumably, but this is near the focal point of the earthquake, and surge should have arrived 8 minutes ago as I write this. No indication of any water level change. I think this was a false positive.
