real world physics context for a tsunami: A tsunami usually travels at the speed of a jet Airliner or therabouts

Real-World Physics Context

Actual Speed: Real tsunamis do not travel at 1,000 miles per hour. In the deep open ocean, a tsunami typically moves at 500 to 600 miles per hour (roughly the speed of a jet airliner), limited by ocean depth. 
Actual Travel Time: At a realistic deep-water speed of about 500 mph, a wave traveling from Hawaii to California actually takes roughly 4.5 to 5 hours to make the crossing.
Slowing Down: As the wave approaches the shallower coastal waters of California, it slows down significantly to about 20 to 30 miles per hour, while its height increases. You can check official safety rules during an alert through the National Tsunami Warning Center.