Earthquakes occur when plates collide.
Tsunamis can result from earthquakes. Earthquakes are measured on a seismic scale of magnitude called the Richter Scale. The Kobe earthquake had a magnitude of 7.2. In the last 25 years, the worst earthquake in terms of the number of deaths was the 1988 NW Armenia earthquake with 55,000 deaths, while the largest on the Richter scale was the 1976 Tangshan, China, one at a magnitude of 8.2. The Northridge earthquake killed only 61 people.