earthquakes
Download
Skip this Video
Download Presentation
Earthquakes

Loading in 2 Seconds...

play fullscreen
1 / 25

Earthquakes - PowerPoint PPT Presentation


  • 140 Views
  • Uploaded on

Earthquakes. Today’s Journey.  0507.7.1 Create a model to illustrate geologic events responsible for changes in the earth’s crust.  0507.7.2 Prepare a chart to compare how volcanoes, earthquakes, faulting, and plate movements affect the earth’s surface features.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Earthquakes' - jewell


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
today s journey
Today’s Journey
  • 0507.7.1 Create a model to illustrate geologic events responsible for changes in the earth’s crust.
  • 0507.7.2 Prepare a chart to compare how volcanoes, earthquakes, faulting, and plate movementsaffect the earth’s surface features.
  • State Performance Indicators
  • SPI 0507.7.1 Describe internal forces such as volcanoes, earthquakes, faulting, and plate movements thatare responsible for the earth’s major geological features such as mountains, valleys, etc.
what is an earthquake
What is an earthquake?
  • Used to describe both sudden slip on a fault, and the resulting ground shaking and radiated seismic energy caused by the slip (Transform Boundaries)
  • Caused by volcanic or magmatic activity,
  • Caused by other sudden stress changes in the earth.
three types of faults
Three Types of Faults

Strike-Slip

Thrust

Normal

what causes earthquakes
What causes earthquakes?
  • Tectonic plates move past each other causing stress-built up energy on a fault. Stress causes the rock to deform.
    • The amount of energy released depends on how much rock breaks and how far the blocks of rock move.
slide6

Focus – point inside the Earth where an earthquake begins; most of these are less than 45 mi below the surface. Epicenter – point on Earth’s surface above focusWhere do you think would the intensity be strongest?

slide7
The hardest shaking is going to be at the epicenter of an earthquake because the seismic waves at the focus of an earthquake are the strongest and the epicenter is directly above it.
    • These seismic waves spread out from the focus. As they do, their energy grows weaker.
how seismographs work
How Seismographs Work

the pendulum remains fixed as the ground moves beneath it

http://www.uwgb.edu/dutchs/EarthSC-102VisualsIndex.HTM

typical seismogram
Typical Seismogram

http://isu.indstate.edu/jspeer/Earth&Sky/EarthCh11.ppt

there are two types of seismic waves
There are two types of Seismic Waves
  • Body Waves-move through the “body” of the Earth or the inside.
    • They can pass through rock and liquid.
  • Surface waves-move along Earth’s surface.
primary waves p waves
Primary Waves (P Waves)
  • A type of seismic body wave that compresses and expands the ground
  • The first wave to arrive at an earthquake
  • When they reach the surface, they cause rock to move back and forth.

http://daphne.meccahosting.com/~a0000e89/insideearth2.htm

secondary waves s waves
Secondary Waves (S Waves)
  • A type of seismic body wave that moves the ground up and down or side to side

http://daphne.meccahosting.com/~a0000e89/insideearth2.htm

slide13
Comparing Seismic WavesMake a quick venn diagram to compare the two types of body waves that occur due to an earthquake.
surface waves
Surface Waves
  • Move along the Earth’s surface
  • Known as L waves
  • Produces motion in the upper crust
    • Motion can be up and down
    • Motion can be around
    • Motion can be back and forth
  • Travel more slowly than S and P waves
  • More destructive because they make the ground swell and roll like ocean waves.
  • Do not travel too far from the epicenter.
how do scientists calculate how far a location is from the epicenter of an earthquake
How do scientists calculate how far a location is from the epicenter of an earthquake?
  • Scientists calculate the difference between arrival times of the P waves and S waves
  • The further away an earthquake is, the greater the time between the arrival of the P waves and the S waves
locating earthquakes
Locating Earthquakes

http://www.uwgb.edu/dutchs/EarthSC-102VisualsIndex.HTM

locating earthquakes1
Locating Earthquakes

http://www.uwgb.edu/dutchs/EarthSC-102VisualsIndex.HTM

locating earthquakes2
Locating Earthquakes

http://www.uwgb.edu/dutchs/EarthSC-102VisualsIndex.HTM

how are earthquakes measured richter scale
How are Earthquakes Measured? Richter Scale

6: Very Strong

7: Severe

2-4:

Moderate- Weak

8: Violent

9: Extreme

5: Strong

how are earthquakes measured mercalli intensity scale
How are Earthquakes Measured? Mercalli Intensity Scale

Click Link for Interactive Demo http://elearning.niu.edu/simulations/images/S_portfolio/Mercalli/Mercalli_Scale.swf

Click Link for Interactive Demo http://elearning.niu.edu/simulations/images/S_portfolio/Mercalli/Mercalli_Scale.swf

seismic waves in the earth
Seismic Waves in the Earth

http://www.uwgb.edu/dutchs/EarthSC-102VisualsIndex.HTM

tsunamis
Tsunamis

http://www.uwgb.edu/dutchs/EarthSC-102VisualsIndex.HTM

formation of a tsunami
Formation of a tsunami

http://isu.indstate.edu/jspeer/Earth&Sky/EarthCh11.ppt

today s journey1
Today’s Journey
  • 0507.7.1 Create a model to illustrate geologic events responsible for changes in the earth’s crust.
  • 0507.7.2 Prepare a chart to compare how volcanoes, earthquakes, faulting, and plate movementsaffect the earth’s surface features.
  • State Performance Indicators
  • SPI 0507.7.1 Describe internal forces such as volcanoes, earthquakes, faulting, and plate movements thatare responsible for the earth’s major geological features such as mountains, valleys, etc.
ad