Seismic Hazards

A seismic hazard is:

• a natural disaster caused by human activities

• a type of weather phenomenon

• a geological event that can cause ground shaking

• an astronomical event

What percentage of all earthquakes occur in the circum-Pacific belt?

• 50%

• 80%

• 15%

• 5%

Approximately 15% of earthquakes occur in the _________.

• Mediterranean-Asiatic belt

• Pacific Ring of Fire

• Mid-Atlantic Ridge

• East African Rift

Which of the following plate margins are prone to earthquakes?

What happens when the energy stored in rocks is released?

• Rocks rupture and rebound

• Rocks bend and stay deformed

• Energy is released in waves that radiate outward from the fault

• Rocks bend until the strength of the rock is exceeded

• Rupture occurs and the rocks quickly rebound to an undeformed shape

The point within the crust at which the release in pressure occurs is called the _______.

• Focus

• Epicenter

• Fault Line

• Seismic Zone

Fill in the blank: The point on the surface above the focus, usually receiving the strongest seismic waves, is called the _______.

• Epicentre

• Hypocentre

• Seismic Zone

• Fault Line

Shallow focus earthquakes are ______ km deep.

• less than 70

• 70 to 300

• 300 to 700

• more than 700

What are the fastest type of body waves?

• P waves

• S waves

• Surface waves

• Love waves

P waves can travel through which of the following?

• Solids only

• Liquids only

• Solids and liquids

• Gases only