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Daily Routine
• Sit in your appropriate seat quietly
• Have all necessary materials out
• All back packs on the floor
• All cell phones on silent and away in backpacks
• All IPods off and headphones out of your ears
• Hats off
• No food or drink except for water
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Bellwork • What are seismic waves? Describe the three
types of seismic waves.
• What are the three types of faults?
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Earth Science Announcements
• Volcano Project: Due Today
• Midterm 10/9 or 10/10
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How to find the epicenter
How does earthquakes affect our lives?
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Richter Moment of Magnitude Scale
• Developed by Charles Richter in 1935
• Mathematical calculation for the intensity of an earthquake
• Calculated using the amplitude of the waves on a seismogram
• Measures surface waves energy from the epicenter
• Increases by a factor of 10 (log)
• Represented by whole numbers and decimals
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Richter Moment of Magnitude Scale
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What is the usefulness of a seismogram?
• Determine amplitude of waves from an earthquake
• Calculate magnitude of an earthquake
• Calculate where the epicenter of an earthquake is
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Distance To Earthquake Epicenter
• Scientists use the seismograph to locate the epicenter of an earthquake
• Remember, the P-wave is faster and arrives first at a seismic station
• Every Seismograph records a time delay between the P and S and waves
• The farther from
the earthquake
epicenter, the
greater the time
delay
• This time delay
between the P and
S wave is used to
find the distance to
the earthquake
epicenter
P-Waves S-Waves
Surface-Waves
P-Waves S-Waves
Surface-Waves
P-Wave Arrival Time
S-Wave Arrival Time
S-P Time Delay =
Distance to Epicenter
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Distance To
Epicenter
---------- = S - waves
--------- = P - waves
P-Waves
Epicenter
Distance to
Epicenter
S-Waves
Seismic
Station
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S-Wave Time - P-Wave Time Distance
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Let’s practice
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Math work
• S Wave comes in at:
• 25:00 minutes
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Let’s practice
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Math work
• S Wave comes in at:
• P wave comes in at:
• 25:00 minutes
• 20:00 minutes
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Let’s practice
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Math work
• S Wave comes in at:
• P wave comes in at:
• Do the math:
• 25:00 minutes
• 20:00 minutes
• 25-20:00 = 5:00 minutes
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Epicenter
S-P Time Delay =
Distance to Epicenter
The time delay between the
S and P wave gives us the
Distance to the epicenter
In other words, S-P Time Delay = Distance to Epicenter
Seismic
Station A
P-Wave S-Wave
Distance to
Epicenter
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Epicenter
Seismic
Station A
Seismic
Station B
Seismic
Station C
P-Wave S-Wave
P-Wave S-Wave
P-Wave S-Wave
Epicenter
Triangulation
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Daily Routine
• Sit in your appropriate seat quietly
• Have all necessary materials out
• All back packs on the floor
• All cell phones on silent and away in backpacks
• All IPods off and headphones out of your ears
• Hats off
• No food or drink except for water
![Page 21: Daily Routine - Mr. Hamilton's Science Websitehamiltonlifephysscience.weebly.com/uploads/2/4/2/0/24200738/... · Daily Routine •Sit in your appropriate seat quietly •Have all](https://reader034.vdocuments.us/reader034/viewer/2022051807/6005f89a2bbfb75a21797d20/html5/thumbnails/21.jpg)
Bellwork • What do you use to determine how far the
epicenter is located from a seismic station?
• Why can’t one seismic station determine where the epicenter of an earthquake is located? How many stations do you need to make a better locate the epicenter?
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Earth Science Announcements
• Volcano Project: Due Today
• Midterm 10/9 or 10/10
![Page 23: Daily Routine - Mr. Hamilton's Science Websitehamiltonlifephysscience.weebly.com/uploads/2/4/2/0/24200738/... · Daily Routine •Sit in your appropriate seat quietly •Have all](https://reader034.vdocuments.us/reader034/viewer/2022051807/6005f89a2bbfb75a21797d20/html5/thumbnails/23.jpg)
How to find the epicenter
How does earthquakes affect our lives?