Earthquakes

_______________are the vibrations in the ground that result from movement along breaks in Earth’s lithosphere

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

The _________of an earthquake is the location on Earth’s surface directly above the focus.

________ waves move the ground up and down and side to side, like an ocean wave.

Scientists who study earthquakes are called ________.

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