Exploring Earthquakes and the Dynamic Crust

This video is the 31st in an Earth Science review series, focusing on earthquakes. It covers key concepts such as the epicenter, p waves, and s waves, and explains how seismographs measure earthquake magnitude. The video also details how to interpret an earthquake chart, including epicenter distance and travel time. Practice questions are provided to reinforce understanding.

What is the point on the Earth's surface directly above the focus of an earthquake called?

• Epicenter

• Hypocenter

• Fault line

• Seismic point

Which type of wave arrives first at a seismic station during an earthquake?

• P wave

• Surface wave

• S wave

• Love wave

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NGSS.HS-PS4-1

What type of wave can travel through solids, liquids, and gases?

• Surface wave

• P wave

• Rayleigh wave

• S wave

What instrument is used to measure the magnitude of an earthquake?

• Anemometer

• Thermometer

• Barometer

• Seismograph

What does a closer arrival time between P waves and S waves on a seismogram indicate?

• The earthquake was very deep

• The earthquake was very strong

• The earthquake was very far away

• The earthquake was very close

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How many seismic stations are needed to accurately determine the epicenter of an earthquake?

• One

• Three

• Two

• Four

What scale is currently used to measure the strength of an earthquake?

• Mercalli scale

• Beaufort scale

• Richter scale

• Moment magnitude scale

If the P wave took 4 minutes to reach a seismic station, approximately how far away was the epicenter?

• 1,000 km

• 2,000 km

• 3,000 km

• 4,000 km

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NGSS.HS-ESS2-1

NGSS.HS-PS4-1

What is the term for the area on Earth where no seismic waves are detected after an earthquake?

• Seismic gap

• Shadow zone

• Focus

• Epicenter

If an S wave arrives at 10:06:40 and the epicenter is 1,800 km away, what time did the P wave arrive?

• 10:03:40

• 10:04:40

• 10:05:40

• 10:06:00

Tags

NGSS.HS-PS4-1