1. Welcome to Science 10/1 Update your grade sheet. If you need help with a grade you need to ask. Then use your book to complete the Ch. 8 Section 2 Notes. AssignmentPoints Received Total Points Possible 1. Signed Rules & Procedures10 2. All About You5 3. Ch. 1 Section 1 Review5 4. Science Pre-Test10 5. Brain Pop Sci. Meth. WS10 6. Observation vs. Inference Unit 1 Section 2 Notes10 7. Sci. Meth Quiz21 8. Tootsie Pop Lab10 9. Earth’s Layers WS14 10. Earth’s Layers Quiz13 11. Liquid Layers Lab15 12. Sea-Floor Spreading Lab10 13. Ch. 7 Test36 14. Mountain Range Assignment16 15. Ch. 7 Section 4 Quiz6

2. I. Earthquake Measurement A. What information do scientists try and figure out after an earthquake? When and where it started. http://earthquake.usgs.gov/earthquakes/recenteqsus/

3. II. Locating Earthquakes How do we locate EQ’s? A. Seismographs- instrument that records the motion of seismic waves http://www.suu.edu/faculty/colberg/Hazards/Earthquakes/17_Seismo/17_Seismo.html http://www.suu.edu/faculty/colberg/Hazards/Earthquakes/17_Seismo/17_Seismo.html B. Seismogram- tracing of an earthquakes seismic waves by a seismograph http://www.iris.edu/hq/files/programs/education_and_outreach/aotm/17/Seismogram_TeleseismicEarthquake.mov

5. III. When did it happen? A. earthquakes start when rocks along a fault slip and create seismic waves BBC News - How earthquakes happen

6. IV. Where did it happen? A. epicenter- point on Earth’s surface directly above an EQ’s starting point. B. focus- point inside Earth where an earthquake begins Fig. 16.4 - Focus of an Earthquake

7. Where did it happen? How does knowing the epicenter of EQs help seismologist predict future EQs? Gap Hypothesis- EQs are more likely to happen in areas along faults that have not had EQs recently.

8. V. Measuring Earthquake Strength A. Why do scientists and public officials want to know how strong earthquakes are? So they can prepare for future EQs.

9. VI. The Richter Scale A. Richter Scale- used to measure EQ strength B. Magnitude- The amount of energy an earthquake has. C. Magnitude- number given to an earthquake based on its seismic waves

10. Assignment To find the distance to epicenter: The P-wave and S-wave are separated by 4:05 (4 minutes, 5 seconds). You need to find a spot on the graph where the P- line and the S-line are separated by 4:05. Take a scrap piece of paper, line it up along the left edge of the chart. Put a small tick mark on your scrap paper at zero, and a small tick mark at 4:05. Slide the scrap paper up along the chart until the two tick marks just touch the P and S lines. BE SURE THAT YOUR SCRAP PAPER IS PERFECTLY STRAIGHT UP AND DOWN (use the lines on the grid as a guide). Now that you have found the right spot on the graph, drop a line straight down to the bottom of the graph to read the distance- 2,600km.