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