Earthquakes

Front

What is the point below the surface of the Earth where the rock breaks and causes an earthquake?

Back

Focus

Front

What is a region in Earth's crust that is broken and where movement occurs?

Back

Fault

Front

How many seismograph stations are needed to pinpoint an epicenter?

Back

3

Front

What instrument records and measures seismic waves?

Back

Seismograph

Front

What is the point on the Earth's surface directly above the focus of an earthquake?

Back

Epicenter

Front

What are the waves called that are generated by the sudden release of energy in the Earth's crust?

Back

Seismic waves

Front

What type of fault occurs when two blocks of the Earth's crust slide past each other horizontally?

Back

Strike-slip fault

Front

What type of seismic wave travels the fastest and is the first to be detected by seismographs?

Back

Primary wave (P-wave)

Front

What type of seismic wave causes the ground to shake up and down or side to side?

Back

Secondary wave (S-wave)

Front

What is the scale called that measures the magnitude of an earthquake?

Back

Richter scale