Earthquakes

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

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

• P waves
• S waves

What is the purpose of the three points in the center of the circles on the map?  

• They are a plot for predicting earthquake activity.  
• They calculate the speed of seismic waves. 
• They show the mountains most likely to be affected by earthquakes.  
• They are used to locate an earthquake's epicenter.

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

• P Wave
• Rayleigh Wave
• S Wave
• Shear Wave

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

• P Wave
• Rayleigh Wave
• S Wave
• Shear Wave

S Waves can move through which of the following?

• Gas
• Liquid
• Solid
• All of these

Stretching rock so it becomes thinner in the middle is what kind of stress?

• tension
• compression
• shearing

Squeezing rock until it breaks is what stress?

• tension
• compression
• shearing

What fault has little up or down motion?

• strike-slip
• normal
• reverse

A type of fault where rocks on either side move past each other sideways is called:

• normal fault
• reverse fault
• strike-slip fault