Earthquakes 7.1 Earthquakes occur along faults. 7.2 CHAPTER NEW CHAPTER Earthquakes the BIG idea Earthquakes release stress that has built up in rocks. 7.1 Earthquakes occur along faults. 7.2 Earthquakes release energy. 7.3 Earthquake damage can be reduced. CHAPTER OUTLINE CHAPTER RESOURCES
Earthquakes occur along faults. 7.1 Earthquakes occur along faults. Normal faults form as rocks are pulled apart. fault stress earthquake CHAPTER RESOURCES SECTION OUTLINE
Earthquakes occur along faults. 7.1 Earthquakes occur along faults. Normal faults form as rocks are pulled apart. Reverse faults form as rocks are pushed together. fault stress earthquake CHAPTER RESOURCES SECTION OUTLINE
Earthquakes occur along faults. 7.1 Earthquakes occur along faults. Normal faults form as rocks are pulled apart. Reverse faults form as rocks are pushed together. fault Strike-slip faults form as rocks are pushed horizontally in opposite directions. stress earthquake VISUALIZATION Explore animations showing fault motion. CLASSZONE.COM CHAPTER RESOURCES SECTION OUTLINE
7.1 fault Earthquakes occur along faults. stress A fracture in Earth’s lithosphere along which blocks of rock move past each other. earthquake CHAPTER RESOURCES KEY CONCEPT SUMMARY
7.1 stress Earthquakes occur along faults. The force applied by an object pressing on, pulling on, or pushing against another object. earthquake CHAPTER RESOURCES KEY CONCEPT SUMMARY
7.1 earthquake Earthquakes occur along faults. stress A shaking of the ground caused by the sudden movement of large blocks of rocks along a fault. earthquake CHAPTER RESOURCES KEY CONCEPT SUMMARY
Earthquakes release energy. 7.2 Earthquakes release energy. seismic wave focus epicenter seismograph Seismic waves move out from the focus in all directions. VISUALIZATION Explore primary-wave and secondary-wave motion. CLASSZONE.COM CHAPTER RESOURCES SECTION OUTLINE
7.2 seismic wave Earthquakes release energy. focus The vibrations caused by an earthquake. epicenter seismograph CHAPTER RESOURCES KEY CONCEPT SUMMARY
7.2 focus Earthquakes release energy. seismic wave focus focus In an earthquake, the point underground where the rocks first begin to move. epicenter seismograph CHAPTER RESOURCES KEY CONCEPT SUMMARY
7.2 epicenter Earthquakes release energy. seismic wave epicenter focus The point on Earth’s surface directly above the focus of an earthquake. epicenter seismograph CHAPTER RESOURCES KEY CONCEPT SUMMARY
7.2 seismograph Earthquakes release energy. seismic wave seismograph focus An instrument that constantly records ground movements. epicenter seismograph CHAPTER RESOURCES KEY CONCEPT SUMMARY
Earthquake damage can be reduced. 7.3 Earthquake damage can be reduced. A powerful earthquake releases more energy and causes more shaking of the ground than does a weak earthquake. aftershock liquefaction tsunami CHAPTER RESOURCES SECTION OUTLINE
Earthquake damage can be reduced. 7.3 Earthquake damage can be reduced. aftershock An area’s risk of earthquakes can be predicted. 0 200 400 kilometers 0 200 400 miles liquefaction tsunami CHAPTER RESOURCES SECTION OUTLINE
Earthquake damage can be reduced. 7.3 Earthquake damage can be reduced. Structures can be designed for greater safety in an earthquake. aftershock liquefaction tsunami CHAPTER RESOURCES SECTION OUTLINE
7.3 aftershock Earthquake damage can be reduced. liquefaction A smaller earthquake that follows a more powerful earthquake in the same area. tsunami CHAPTER RESOURCES KEY CONCEPT SUMMARY
7.3 liquefaction Earthquake damage can be reduced. aftershock liquefaction liquefaction A process in which the shaking of ground causes loose, wet soil to act like a liquid. tsunami CHAPTER RESOURCES KEY CONCEPT SUMMARY
7.3 tsunami Earthquake damage can be reduced. aftershock tsunami liquefaction A water wave caused by an earthquake, volcanic eruption, or landslide. tsunami CHAPTER RESOURCES KEY CONCEPT SUMMARY
7.1 Earthquakes occur along faults. I. Earthquakes occur along faults. A. Rocks move along faults. stress B. Faults are classified by how rocks move. earthquake 1. Normal Faults 2. Reverse Faults 3. Strike-Slip Faults CHAPTER RESOURCES KEY CONCEPT SUMMARY
Earthquakes release energy. 7.2 Earthquakes release energy. II. Earthquakes release energy. seismic wave A. Energy from earthquakes travels through Earth. focus epicenter 1. Waves and Energy seismograph 2. Primary Waves 3. Secondary Waves 4. Surface Waves B. Seismic waves can be measured. 1. Using Seismographs CHAPTER RESOURCES 2. Locating an Earthquake KEY CONCEPT SUMMARY
Earthquake damage can be reduced. 7.3 Earthquake damage can be reduced. III. Earthquake damage can be reduced. aftershock A. Earthquakes can cause severe damage and loss of life. liquefaction 1. Earthquake Magnitude tsunami 2. Damage from Earthquakes 3. Damage from Tsunamis B. Scientists work to monitor and predict earthquakes. C. Structures can be designed to resist earthquake damage. CHAPTER RESOURCES KEY CONCEPT SUMMARY
Image Gallery Click on the icons to see a larger image or animation. CHAPTER HOME Image Gallery Click on the icons to see a larger image or animation. VISUALIZATION Explore animations showing fault motion. CLASSZONE.COM VISUALIZATION Explore primary-wave and secondary-wave motion. CLASSZONE.COM
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