Earthquakes

(a)   are the vibrations in the ground that result from movement along breaks in Earth’s lithosphere

A(n) (a)   is a break in Earth’s lithosphere where one block of rock moves toward, away from, or past another block.

The (a)   of an earthquake is the location on Earth’s surface directly above the focus.

(a)   waves move the ground up and down and side to side, like an ocean wave.

Scientists who study earthquakes are called (a)   .

What scale uses the amount of motion at a given distance from an earthquake to determine the magnitude of the earthquake?

• Modified Mercalli scale

• moment magnitude scale

• Richter magnitude scale

What scale measures the amount of energy released by an earthquake?

• moment magnitude scale

• Modified Mercalli scale

• Richter magnitude scale

What scale measures earthquake intensity based on descriptions of the earthquake’s effects on people and structures?

• Richter scale

• moment magnitude scale

• Modified Mercalli scale

What do seismic waves do as they travel through hot material?

• speed up

• slow down

• make circles

What do scientist base a risk assessment on? (choose 4)

• distance relative to plate boundaries or other fault lines

• the frequency and magnitude of earthquakes in the past

• the weather and temperature

• building design

• the geology of the region