Earthquakes

How strong an earthquake is.

• focus

• magnitude

• epicenter

• after shock

• Richter Scale

The scale on which the strength of the earthquake is measured.

• focus

• magnitude

• epicenter

• after shock

• Richter Scale

The instrument to measure the strength of the earthquake.

• focus

• magnitude

• epicenter

• after shock

• Seismometer

Smaller earthquakes after the main, large one.

• focus

• magnitude

• epicenter

• after shock

• Seismometer

The place in the earth where rocks are moving.

• focus

• magnitude

• epicenter

• after shock

• Seismometer

The point at the surface above the focus.

• focus

• magnitude

• epicenter

• after shock

• Seismometer

Tags

NGSS.MS-ESS3-2

Match the following:

How do earthquakes happen?

• Earthquakes occur at plate margins.

• Third event

• This release of pressure is called an earthquake.

• Second event

• The plates sometimes lock, causing pressure to build up.

• Fifth event

• This pressure is suddenly released in a jerky movement.

• Four event

• As the plates move past each other at the margins the movement is not smooth.

• First event

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS3-2

Which statement describes the location of an earthquake's epicenter?

• It is located at the point where circles intersect on a map.

• It is determined by the arrival time of surface waves.

• It is determined by the depth of the focus.

• It is located using a single set of data.

Which type of wave makes the ground roll?

• S wave

• P wave

• Surface wave

Which type of wave is the first to arrive during an earthquake?

• S wave

• P wave

• Surface wave