Seismology
Presentation
•
Science
•
4th Grade
•
Hard
Joseph Anderson
FREE Resource
10 Slides • 4 Questions
1
Seismic Waves and Their Effects
4th Grade
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Scientists observe how wave energy travels along Earth's surface.
During an earthquake, energy is released into the Earth as seismic waves.
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Multiple Choice
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Forces applied by one large rock mass on another cause stress in Earth's crust.
Over time, as more force by rock masses is applied, the rocks bend and begin to build up stored energy. If more stress builds up, the large rock mass can break or slip along a fault.
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Focus
Seismic waves travel outward in all directions from the earthquake's underground origin, or its focus.
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Epicenter
The point on the Earth's surface directly above the focus is the earthquake's epicenter.
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Multiple Choice
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Seismic Waves
Seismic waves can be destructive.
The waves that travel along the Earth's surface are the most destructive.
Surface wave energy is always strongest at the earthquake epicenter.
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Seismographs
Scientists can use seismic waves to map locations of earthquake epicenters.
Scientists measure seismic waves on instruments called seismographs.
The arrival time and strength of each kind of seismic wave is recorded by the seismograph onto readings called seismograms.
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Multiple Choice
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Richter Scale
Scientists measure the strength of an earthquake using something called the Richter scale.
The strength of the earthquake is given a number from 0 to 10.
The larger the number, the stronger and more destructive the earthquake is.
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13
Multiple Choice
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Thank you!
Tomorrow you will use this knowledge to complete your Study Island assignment. Good luck!
Seismic Waves and Their Effects
4th Grade
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