People and Earthquakes
Chapter 10 Section 3pages 313-319
By : Brier, Emily, and Caitlyn
Magnitude- measure of energy realized during an earth quake.
Liquefaction- occurs when wet soil acts more like a liquid during an earthquake.
Tsunami- seismic sea wave that begins over an earthquake focus and can be highly destructive when reaches the shore.
Need to know vocabulary
-Tsunami: Seismic sea wave that begins over an earthquake focus and can be highly destructive when reaches the shore.
-Focus: The point were energy release first occurs is the Focus of an earthquake.
-An earthquake under the ocean causes a sudden movement under the ocean floor.
-Tsunamis are often barely visible when they are in the deep sea (about 1 km high) this makes them hard to see until they approach shore , that’s when they begin to reach about 30 km eight and become very visible.
- Tsunamis travel fast but not at infinite speed. -An earthquake usually has to have a magnitude of about 6.75 (on
the Richter scale) for it to create a tsunami.
Tsunami’s
- The Richter magnitude scale is used to describe the strength of an earthquake and is based on the height of the lines on a seismograph.
- The Mercalli scale describes the intensity of
the earth quake and the damage it causes.
- seismograph: Seismic waves from earthquakes are measured with an instrument known as a seismograph.
Tools used to measuring earthquake magnitude
Before/During After
Preparation for an earthquake/during an earthquake After an earthquake
-First you want to make sure that any electrical things dealing with gases or water are turned off.
-If you are indoors then stay away from objects that could possible brake or fall on you during an earthquake, such as windows.
-Try to find shelter under a desk or a solid door way that is sturdy enough to not collapse because of the vibrations of the earthquake.
-If you are out doors then stay out in the open, avoid falling power lines, chimneys , or any other parts of a building that might fall/ collapse.
-Shut off any damaged gas or water lines immediately.
*If you can smell gas this means there has been a gas leek, immediately exit the building and call the authorities to alert them about the leek.
-Avoid damaged buildings. -Be careful around glass or ruble
and make sure to wear boots to protect your feet from getting cuts.
-Stay far away from any beaches , Tsunamis some times hit after the ground has stopped shaking.
Test question #1
Correct answer …B
evacuate the building and alert the authorities
1.)If you smell a gas leak after an earthquake do you want to?A-Try to find the location of the smellB-evacuate the building and alert the authoritiesC-turn off the gas and remain in the building
Test question #2
Correct answer…E
Magnitude
2.)_____: measure of energy realized during an earthquake
A-Seismograph B-Richter scale C-Mercalli scale D-Liquefaction E-magnitude F-Tsunami
Test question #3
Correct answer…C
Mercalli scale
3.)The ______: scale describes the intensity of the earth quake and the damage it causes.
a.) Seismographb.) Richter c.) Mercalli
Earthquakes and the destruction it may cause
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