Understanding Mega Thrust Earthquakes

The video discusses recent earthquake activity in Southwestern BC, explaining that while there have been several noticeable quakes, they do not increase the likelihood of a larger event. It covers the basics of plate tectonics, describing how the movement of the Earth's plates causes different types of earthquakes: crustal, deep, and mega thrust. The video emphasizes that mega thrust earthquakes, though rare, can be devastating and highlights the importance of preparedness. It reassures viewers that current data does not indicate an imminent large earthquake, encouraging them to have a plan and emergency kit ready.

What is the main reason the recent earthquakes in Southwestern BC were felt by many people?

• They were of an unusually high magnitude.

• They were very deep.

• They occurred far from populated areas.

• They were shallow and close to large populations.

What is the outer layer of the Earth compared to in the video?

• A liquid ocean

• A cracked eggshell

• A solid rock

• A smooth surface

Which type of earthquake is most likely to occur close to major communities like Vancouver and Victoria?

• Volcanic earthquakes

• Mega thrust earthquakes

• Deep earthquakes

• Crustal earthquakes

What is the expected magnitude of a mega thrust earthquake?

• 9 or stronger

• 7 to 8

• 6 to 7

• 5 or lower

How often do mega thrust earthquakes occur?

• Every 10 to 20 years

• Every 1000 to 2000 years

• Every 200 to 800 years

• Every 50 to 100 years

What is a key indicator that a mega thrust earthquake might occur soon?

• A single large earthquake

• A series of deep earthquakes

• An earthquake swarm of crustal microquakes

• A volcanic eruption

What is the significance of the year 1700 in the context of mega thrust earthquakes?

• It was the year when the first earthquake-resistant building was constructed.

• It was the year of the largest earthquake ever recorded.

• It was the year when earthquake prediction started.

• It was the year of the last mega thrust earthquake.

Why is it important to have building codes and retrofits in place?

• To minimize damage during a mega thrust earthquake

• To ensure buildings are earthquake-proof

• To make buildings more energy-efficient

• To prevent all earthquakes

What should people do in response to recent earthquake activity?

• Panic and evacuate immediately

• Prepare an emergency kit and plan

• Wait for government instructions

• Ignore it and continue as usual

What is the main takeaway from the video regarding earthquake preparedness?

• Having a plan and kit is essential for safety.

• Only large earthquakes require preparation.

• Earthquakes can be completely prevented.

• Earthquake preparedness is unnecessary.