Chapter 8

Major earthquakes are often followed by somewhat smaller events known as ________. Aftershocks Foreshocks Tremors Hyposhocks

Aftershocks

The distance between a seismological recording station and the earthquake source is determined from the ________. Earthquake magnitude Intensity of the earthquake Length of the seismic record Arrival times of P and S waves

Arrival times of P and S waves

Where do most earthquakes occur? East Pacific Rise Alpine-Himalayan Belt Mid-Atlantic Ridge Circum-Pacific Belt aka Ring of Fire

Circum-Pacific Belt aka Ring of Fire

The mechanism by which rocks store and eventually release energy in the form of an earthquake is termed ________. Stress Fracture Elastic Rebound Fault Displacement Seismic Rebound

Elastic Rebound

When an earthquake occurs, energy radiates in all directions from its source. The source is also referred to as the ________. This is different than the point directly above it at the surface of the Earth. Hypocenter Epicenter Focus Seismic Zone

Hypocenter

The ________ Magnitude is a measure of the total energy released. It does not directly measure the extent of building damage. Gutenburg Reid Mercalli Moment

Moment

_______ have the highest velocities. P Waves S Waves Surface Waves None of the above

P Waves

Which one of the following statements is correct? P waves travel through solids; S waves do not. P and S waves travel through liquids, but P waves do not travel through solids. S waves travel through solids and P waves travel through liquids. P and S waves travel through liquids, but S waves do not travel through solids.

S waves travel through solids and P waves travel through liquids.

The instrument that records earthquake events is termed a ________. Polygraph Barograph Thermograph Seismograph

Seismograph

Overall, this type of seismic wave is the most destructive. P Waves S Waves Surface Waves All are equal

Surface Waves