What method should you use during an earthquake drill? (you should know this from our earthquake drills in class!!!)
What is the definition of earthquake that WE derived in class! Recall the tossing of Mr. Webster!
How does an earthquake travel?
*P Waves are the fastest. They travel through solids, liquids, and gases. They travel by a push-pull method.
*S Waves arrive next. They travel ONLY through solids. They are absorbed by liquids and gases. They move side to side and may not be recorded by a seismograph.
*L Waves are the slowest and the most powerful. They cause the most damage because of their twisting and bending motion.
What results from a major earthquake on oceanic crust? Recall Tsunami from the video and Mr. Purnell's mall survey. Keep in mind that a Tsunami can reach up to 17 meters high (Recall the meter stick demo!)
Know the difference between a seismograph and a seismogram. Recall that Mr. Purnell has a seismogram in the back of the classroom!
* Note that geologists use this information and technology to benefit human kind. What scale do we use to measure an earthquake? What is the range of the scale?
* The range of the Richter-Gutenberg scale goes from I-X, depending on the size of the waves recorded off the seismograph.
* Because of the seismograph, the Richter-Gutenberg is made possible. Thus, technology has changed our research on the earth's crust.

Have another question? Ask a geologist!

Mr. Purnell's Internet Lesson!