Chapter 2. Sec.2

Question 1

Earthquake

Answer 1

Is the shaking and trembling that results from movement of rock beneath earths surface.

Question 2

Focus

Answer 2

Is the area beneath Earths surface where rock that was under stress begins to break or move.

Question 3

P waves

Answer 3

Are seismic waves that compress and expand the ground like an accordion.

Question 4

S waves

Answer 4

Are seismic waves that can vibrate from side to side or up and down.

Question 5

Surface waves

Answer 5

Move more slowly than p and S waves but they can produce severe ground movements.

Question 6

Seismograph

Answer 6

Is an instrument that records and measures an earthquakes seismic waves

Question 7

Modified mercalli scale

Answer 7

Rates the amount of shaking from an earthquake.

Question 8

Magnitude

Answer 8

Is a single number that geologists assign to an earthquake based on the earthquakes size.

Question 9

Richter scale

Answer 9

Rate the magnitude of small earthquakes based on the size of the earthquakes waves as recorded by seismographs.

Question 10

Moment magnitude scale

Answer 10

To rate the total energy an earthquake releases.

Question 11

Epicenter

Answer 11

The point on earths surface directly above an earthquakes focus.