Earthqauke and Volcanoes

The focus of an earthquake is

• The point (below Earth's surface) where rocks first begin to break and the first movement occurs
• The closest seismic station
• The place where the greatest damage occurs
• A fault

Which kind of waves usually do the most damage in an earthquake?

• Body waves (P and S waves)
• Surface waves (L and R waves)

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

At about what time did all of the S-waves hit?

• 20 sec
• 45 sec
• 50 sec

We use this tool to measure seismic waves during earthquakes

• Seismographs
• magnitude
• actual magnitude
• sonograph

This is the name of the single digit number that means how powerful an earthquake is. It is measured on the Richter scale

• Force
• Stress
• Magnitude
• Plate Boundary

These are the first waves released during an earthquake

• S waves
• Surface Waves
• P waves

These are the secondary, or second waves to be released. They cannot travel through the liquid outer core

• S waves
• Surface Waves
• P waves

What type of stress is this?

• compression
• shearing
• tension

What type of stress causes these folds?

• compression
• shearing
• tension