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### 22 Cards in this Set

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 Q What are seismic waves? A The waves produced by earthquakes. Q What causes seismic waves? A When the stress in the rock beneath the Earth's surface builds up enough, the rock breaks or changes shape, releasing energy in the form of waves or vibrations. Q What are the 3 types of seismic waves? A 1. Primary waves 2. Secondary waves 3. Surface waves Q What are Primary waves? A Longitudinal seismic waves. Q What are secondary waves? A Transverse seismic waves. They cannot move through liquids. Q What are surface seismic waves? A Primary and Secondary seismic waves that reach the Earth's surface and combine. Q Which seismic waves move the fastest? A P waves (Primary waves)are fastest. Q Which seismic waves move the slowest? A Surface waves are the slowest. Q What mediums can a P wave travel through? A Solids and liquids Q What medium(s) can a S wave travel through? A Solids only. This means they cannot be detected on the side of the Earth opposite an earthquake. Q What medium(s) can a Surface wave travel through? A A seismic surface wave travels on the SURFACE of solids and liquids. Q What is the earthquake SHADOW ZONE? A The area on the Earth's surface where no seismic waves from a particular earthquake can be detected. Q What seismic waves produce the most severe ground movement and damage? A Surface waves Q What is triangulation? A The use of AT LEAST 3 seismographs to locate the center of an earthquake. Q For what other purpose do geologists use seismographs? A Geologists use seismographs to understand how the what kinds of rocks are deep underground and how they are arraigned. Q What property of seismic waves are used to locate the center of earthquakes? A The difference in the speed of P waves and S waves. Q How do geologists use the difference in seismic wave speed to locate earthquakes? A P waves and S waves arrive at seismographs at different times. Knowing this time difference and the speed of seismic wave through rock lets us calculate how far away the earthquake was. Q What is a seismograph? A An instrument used to detect and measure the strength of earthquakes. It also measures the arrival time of the waves. Q Secondary waves (S waves) cannot travel through what part of the Earth's interior? A The Earth's LIQUID OUTER CORE. Q What type of seismic waves can be detected on the opposite side of the Earth's surface from an earthquake? A Only P waves can be detected because S waves cannot thravel through the Earth's liquid core. Q What is a tsunami? A Surface waves on the ocean caused by an underwater earthquake. Q What is the danger from a tsunami? A While the swell in open ocean is small (under 3 feet), when the wave reaches shore the energy being carried by the wave causes the waves to pile up,producing waves upto 100+ feet high as they come on shore and travel far inland.