Transcript CH 8
CH 8 A fault is ____. • a.a place on Earth where earthquakes cannot occur • b.a fracture in the Earth where movement has occurred • c.the place on Earth’s surface where structures move during an earthquake • d.another name for an earthquake CH 8 An earthquake’s epicenter is ____. • a.the place on the surface directly above the focus • b.a spot halfway between the focus and the surface • c.the spot below the focus • d.any spot along the nearest fault CH 8 When an earthquake occurs, energy radiates in all directions from its source, which is called the ____. • • • • a.epicenter b.focus c.fault d.seismic center CH 8 Earthquakes are usually associated with ____. • a.violent weather • b.faults • c.large cities • d.the east coast of North America CH 8 Which of the following causes earthquakes? • • • • a.elastic rebound b.Richter scale c.release of heat d.frictional heating CH 8 • The hypothesis that explains the release of energy during an earthquake is called the ____. • a.Richter hypothesis • b.moment magnitude hypothesis • c.vibration hypothesis • d.elastic rebound hypothesis CH 8 Most earthquakes are produced by the rapid release of which kind of energy stored in rock subjected to great forces? • • • • a.chemical b.thermal c.elastic d.mechanical CH 8 During an earthquake, the ground surface ____. • • • • a.moves only in a horizontal direction b.moves only in a vertical direction c.can move in any direction d.does not move CH 8 The adjustments of materials that follow a major earthquake often generate smaller earthquakes called ____. • • • • a.foreshocks b.surface waves c.aftershocks d.body waves CH 8 Tsunamis are ____. • a.often generated by movements of the ocean floor • b.waves that are produced by tidal forces • c.waves that cannot cause damage on land • d.also known as tidal waves CH 8 A succession of ocean waves set in motion by a submarine earthquake is called a(n) ____. • • • • a.compression wave b.underwater landslide c.tsunami d.liquefaction CH 8 A tsunami can occur when there is vertical movement at a fault under ____. • • • • a.a mountain range b.the San Andreas Fault c.the ocean floor d.a small inland lake CH 8 Which of the following is used in an attempt to make short-range predictions of when earthquakes will occur? • • • • a.strain in rocks near faults b.height of ocean waves after earthquakes c.changes in the color of rocks near faults d.study of historical records CH 8 Long-range earthquake forecasts are based on the idea that earthquakes are ____. • • • • a.random b.destructive c.fully understood d.repetitive