What do and don't we know about megathrust earthquakes?

The video tutorial explains the nature of megathrust earthquakes, which occur at subduction zones where one tectonic plate dives beneath another. These earthquakes are among the largest globally, releasing over 60% of the total seismic energy since 1964. They typically occur along ocean shorelines but can also happen on land, such as in Nepal. Understanding when and where these earthquakes will occur is crucial for forecasting. The video also explores why some earthquakes generate tsunamis while others do not, emphasizing the importance of understanding fault materials and earthquake physics.

What is a subduction zone in the context of megathrust earthquakes?

• A region where two tectonic plates move apart

• A location where one tectonic plate slides past another

• A boundary where one tectonic plate dives beneath another

• A place where tectonic plates are stationary

Since 1964, what percentage of the total energy released by all earthquakes globally is attributed to megathrust earthquakes?

• 90%

• 60%

• 30%

• 80%

Where do megathrust earthquakes most commonly occur?

• Along shorelines and in oceans

• In urban areas

• In mountain ranges

• In deserts

What is crucial for forecasting an earthquake of a certain magnitude?

• Understanding the strain accumulated on the fault

• Counting the number of previous earthquakes

• Knowing the weather conditions

• Measuring the depth of the ocean

Why is it important to understand the materials on faults in megathrust earthquakes?

• To predict the color of the tsunami

• To understand the physics of earthquakes and resulting hazards

• To measure the temperature of the Earth's core

• To determine the speed of tectonic plate movement