Tsunamis

Although both are sea waves, a tsunami and a tidal wave are two different and unrelated phenomena. A tidal wave is the wave motion of the tides.
Those estimates can be found on our Earthquake Statistics website.
For information on tsunami science and hazard mitigation:
The earliest reference we have to unusual animal behavior prior to a significant earthquake is from Greece in 373 BC. Rats, weasels, snakes, and centipedes reportedly left their homes and headed for safety several days before a destructive earthquake.
Earthquake size, as measured by the Richter Scale is a well known, but not well understood, concept.
Both earthquakes and nuclear tests can rapidly release a large amount of energy. The energy source for small yield (typically less than 50 kilotons) thermonuclear devices is the splitting of heavy radioactive isotopes.
The way an earthquake feels depends on where you are, where the earthquake is, and how big the earthquake is:
Fire extinguisherAdequate supplies of medications that you or family members are takingCrescent and pipe wrenches to turn off gas and water suppliesFirst-aid kit and handbookFlashlights with extra bulbs and batt
An earthquake is caused by a sudden slip on a fa