Earthquake Facts and Concepts

The video provides an overview of earthquakes, discussing their frequency, measurement, and impact. It explains how seismic instruments like seismographs work and introduces the moment magnitude scale, which is used to measure earthquake energy. The video also covers the concept of intensity and its relevance to earthquake damage. Various hazards associated with earthquakes, such as fires, landslides, and tsunamis, are explored, highlighting historical events like the 2010 Haiti earthquake and the 2004 Sumatra tsunami.

Approximately how many earthquakes are strong enough to be felt each year?

• 1,000,000

• 100,000

• 30,000

• 1,000

What instrument is used to record seismic waves?

• Seismograph

• Anemometer

• Thermometer

• Barometer

Which scale is currently used to measure the energy released during an earthquake?

• Richter Scale

• Beaufort Scale

• Moment Magnitude Scale

• Mercalli Scale

How much more energetic is a magnitude 6 earthquake compared to a magnitude 4?

• 1,000 times

• 100 times

• 32,000 times

• 10 times

What is the most powerful earthquake ever recorded in North America?

• 1964 Alaska Earthquake

• 2010 Haiti Earthquake

• 1923 Japan Earthquake

• 1960 Chile Earthquake

What scale is used to express earthquake intensity?

• Richter Scale

• Modified Mercalli Scale

• Fujita Scale

• Moment Magnitude Scale

What was the intensity of the 2010 Haiti earthquake near its epicenter?

• 7

• 8

• 10

• 9

What secondary effect caused the most damage in the 1906 San Francisco earthquake?

• Fires

• Tsunamis

• Landslides

• Avalanches

What phenomenon causes the ground to behave like a liquid during an earthquake?

• Seismic Shift

• Avalanche

• Liquefaction

• Tsunami

What natural disaster can be triggered by an underwater earthquake?

• Tsunami

• Tornado

• Hurricane

• Volcanic Eruption