WARM-UP 12/07Copy the following questions down and wait
to answer them until I play the sound clip after the bell.
1. What do you think is happening?
2. What kind of room was this recorded in? Why do you think this?
Earthquake Notes
Think about these questions, while viewing the following pictures…
1. Why do earthquakes occur? 2. Why do some locations such as California and Japan receive so many earthquakes? 3. Can earthquakes be predicted? 4. Can we design a city to better withstand an earthquake? 5. Can we stop earthquakes before they occur? Should we try?
Watch this short clip…
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
Caused by volcanic or magmatic activity
Caused by other sudden stress changes in the earth.
Three Types of Faults
Strike-Slip Thrust
Normal
What causes earthquakes?Tectonic plates move past each other causing
stress. Stress causes the rock to deform
Primary Waves (P Waves)
A type of seismic wave that compresses and expands the ground
The first wave to arrive at an earthquakehttp://daphne.meccahosting.com/~a0000e89/insideearth2.htm
Secondary Waves (S Waves)A type of seismic wave that moves the ground
up and down or side to side
http://daphne.meccahosting.com/~a0000e89/insideearth2.htm
Surface WavesMove along the Earth’s surfaceProduces motion in the upper crust
Motion can be up and downMotion can be aroundMotion can be back and forth
Travel more slowly than S and P wavesMore destructive
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
How are Earthquakes Measured? Richter 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
