Log: Jan.21st

1. Log: Jan.21st • In your own words describe your idea of an earthquake. Tell if you have experienced a earthquake. • Draw and color 193

2. Log: Jan 24th 2011 • Define Terms to learn in Chapter 8.1 Page 224 • Complete Drawing, coloring and labeling for the Layers of the Earth page 192-193 (Due Tuesday)

3. EarthquakesChap. 8 Japan Earthquake Jan. 17th 1995 (click here)

4. Where are Earthquakes • On the edges of tectonic plates • Tectonic plates – giant pieces of the Earth’s thin, outermost layers • Tectonic plate move in many different ways • They can push toward or away from each other • Slip past each other

5. Faults • The movement of the tectonic plates creates faults • Faults- breaks in the Earth crust along which blocks of the Earths crust • Earthquakes occur along faults because of the sliding

6. Deformation-The change in the shape of a rock do to stress Plastic Deformation Elastic Deformation A temporary shape change that is self-reversing after the force is removed, so that the object returns to its original shape, is called elastic deformation Does lead to quakes • When the stress is sufficient to permanently deform the metal, it is called plastic deformation. • Does not lead to quakes

7. Elastic Rebound- when a rock returns to its original state after stretching, during this energy is released

8. Log: Jan. 6, 2010 • Where do earthquakes take place? • What causes them? • What is a fault?

9. San Andreas fault

10. Plate Motion and Fault typesTransform Motion • When two plates slide past each other • Creates a strike-slip fault-blocks of crust slide horizontally past each other • Strike slip faults do not make cliffs because the blocks of rock are not moving up or down relative to each other.

11. Plate Motion and Fault typesConvergent Motion • Occurs where two plates push together • Creates reverse faults-blocks of crust are pushed together and slid along reveres faults • In a reverse fault the exposed area of the fault is often an overhang. Thus you could not walk on it.

12. Plate Motion and Fault typesDivergent Motion Occurs where two plates pull away from each other Creates normal faults- block of crust pulled away from each other The rock on one side of the fault is moved down relative to the rock on the other side of the fault. Normal faults will not make an overhanging rock ledge. In a normal fault it is likely that you could walk on an exposed area of the fault. Early in the rift-forming process, streams and rivers will flow into the sinking rift valley to form a long linear lake http://www.classzone.com