Volcanoes, Earthquakes, and Plate Tectonics Review

Front

The point beneath earth's surface where rock breaks under stress and triggers an earthquake is called the

Back

focus

Front

The type of seismic waves that arrive at the surface first and move by compressing and expanding the ground like an accordion are called

Back

P waves

Front

S waves are also called

Back

secondary waves

Front

Compared to P waves and S waves, surface waves move

Back

slower

Front

In what direction do seismic waves carry the energy of an earthquake?

Back

away from focus

Front

The rating system that estimates the total energy released by an earthquake is called the

Back

moment magnitude scale

Front

What does a seismograph record?

Back

the ground movements caused by seismic waves

Front

If the Coast Guard warns of a giant wave of water approaching the shore as a result of a major earthquake, they are warning of

Back

a tsunami

Front

What is the minimum number of seismograph stations required to determine the exact location of an earthquake's epicenter?

Back

3

Front

What happens to a tsunami as it approaches shallow water?

Back

Its wave height grows.