Earthquakes

The huge pieces of the earth's crust are called ____________________________. 

• crust
• plates
• directions
• seismos

The epicenter of an earthquake is

• The point below the surface where rock begins to break and the first motion occurs
• The seismic station closest to the earthquake
• The place where the greatest damage occurs
• The point on the surface directly above the focus

This famous transform fault is located in the western United States creates significant earthquake activity for California

• New Madrid
• Denali Fault
• Ramapo Seismic Zone
• San Andreas

The Richter scale measures:

• the amount of radon gas released
• the movement of plates
• the strength of an earthquake
• the weight of tectonic plates

Which travels fastest, always being the first detected by seismic stations?

• P waves
• S waves

What do S (secondary) waves do during an earthquake?

• Shake the ground
• Cause eruptions
• Open cracks in the earth's surface
• Create loud noises

What do S (secondary) waves do during an earthquake?

• Shake the ground
• Cause eruptions
• Open cracks in the earth's surface
• Create loud noises

An instrument that detects and measures earthquakes is a 

• seismogram
• focus seismic map
• focus
• seismograph 

What is a fault?

• A crack in a plate.
• Where two plates move toward each other.

Most earthquakes happen along the _________________. 

• coast
• faults
• desert
• directions