Earth Movements and Major Landforms

To tell how far an earthquake’s epicenter is from a seismograph, scientists measure the difference between the ____.

• arrival times of the P waves and S waves.

• speeds of the surface waves and S waves.

• strengths of the P waves and S waves.

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

What triggers the small earthquakes that occur around a volcano before an eruption?

• lava movements

• upward movement of magma

• pyroclastic flow

Earthquakes are the vibrations in the ground that result from movement along breaks in the lithosphere called ___________.  

• faults

• cracks

• rocks

• epicenters

Tags

NGSS.MS-ESS3-2

____________ is the process when scientists use 3 or more seismometers to accurately locate an earthquake.

• seismology

• angulation

• triangulation

• fault tracking

The Richter scale measures the _________ during an earthquake.

• ground motion

• surface damage

• injury to people

When the force on rocks is great enough, they break, producing vibrations called ____.

Tags

NGSS.MS-ESS2-3

Beneath the earth's surface causing the earthquake

• focus

• epicenter

Tags

NGSS.MS-ESS3-2

The Focus is:

• point beneath the earth

• where the rock under stress breaks

• the stress/break causes an earthquake beneath the earth

• on the surface of the earth

Tags

NGSS.MS-ESS3-2

Shearing stress cause

• normal fault

• reverse fault

• strike slip fault