Earthquakes

Front

What is the strength of an earthquake known as?

Back

Magnitude

Front

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

Back

Focus

Front

What type of fault is caused by tension in rock?

Back

Normal fault

Front

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

Back

Epicenter

Front

Which seismic waves are used to find the epicenter of an earthquake?

Back

Primary and Secondary waves

Front

What instrument measures the intensity of seismic waves?

Back

Seismograph

Front

What is an aftershock?

Back

A smaller earthquake that occurs after a larger earthquake in the same area.

Front

What is the term for the boundary where two tectonic plates meet?

Back

Fault line

Front

What are the two main types of seismic waves?

Back

Body waves and Surface waves.

Front

What is the difference between Primary and Secondary waves?

Back

Primary waves (P-waves) are compressional waves that travel faster than Secondary waves (S-waves), which are shear waves.