✓ Tsunamis

What is a tsunami

• A tsunami is a large wave (or series of waves) formed by a sudden and widespread movement of the earth’s crust, displacing the water above.

• commonly are generated during earthquakes

• Can also form from landslides and submarine volcanic eruptions

• Can efficiently travel across entire ocean basins affecting communities far from their source

How big was the Sumatra earthquake

It was a Magnitude (9.1) with a rupture length of 1,300 kilometers.

What produces tsunamis?

A tsunami is produced by a sudden and widespread movement of the Earth's crust, which displaces the water above it. This includes, earthquakes, landslides, Submarine volcanic eruptions.

If you are near the coast, what two things should make you worried a tsunami is coming?

1. Feeling a strong or long-lasting earthquake (ground shaking).

2. Observing the ocean water suddenly and unusually draw back from the beach.