Tsunami Generation Factors

Tsunamis are large ocean waves typically caused by underwater disturbances. The primary factor influencing their generation is the magnitude and location of earthquakes.

Earthquake Magnitude Requirement

A high Richter scale magnitude is essential for generating a tsunami. Earthquakes need to release a significant amount of energy to displace the large volume of water required.

Location Criticality: Ocean vs. Continent

The location of the earthquake plays a crucial role:

• Under Oceans: Earthquakes occurring beneath the ocean floor can cause vertical displacement of the seabed. This movement displaces the water column above it, initiating tsunami waves.
• Under Continents: Earthquakes on land primarily cause ground shaking and generally do not displace significant volumes of ocean water, making tsunami generation unlikely.

Magnitude Threshold and Tsunami Likelihood

For significant tsunami generation, earthquakes typically need a Richter scale magnitude significantly greater than 8. Magnitudes below '$< 8$' usually lack the energy for major water displacement.

Therefore, earthquakes with magnitudes '$> 8$' occurring under the oceans are the most potent source of tsunamis, as they combine high energy release with the direct mechanism of displacing a large water mass.