Geo101.12.Earthquakes

Geo101.12.Earthquakes - Earthquakes shake rattle and roll...

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1 Earthquakes shake, rattle and roll… San Francisco Bay Earthquakes in the News … Earthquakes happen when the Earth’s crust first bends, then suddenly snaps and breaks… This breaking generates vibrations or seismic waves Radius = 6370 kilometers = 4000 miles 1) sudden formation of new fault or fracture 2) sudden slip on an existing fault 3) sudden rearrangement of minerals in a rock 4) volcanic eruptions 5) landslides 6) meteorite impacts 7) underground (human-made) explosions Seismicity (Earthquake activity) can occur for several reasons …the place on Earth where rock ruptures and slips or the place where an explosion occurs is the focus (or hypocenter ) of the earthquake …the point on the surface of the Earth that lies directly above the focus is the epicenter
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2 Where and why do earthquakes occur… 3 major classes of Earthquakes.. 1) Shallow focus (top 20km of the Earth) …these are the most damaging 2) Intermediate focus (20 and 300 km) 3) Deep focus (300 to about 670 km) Earthquakes at Plate Boundaries Continental transform boundaries Continental rifts and collisions Intraplate earthquakes Shallow focus < 10 km Earthquakes at Plate Boundaries Convergent boundaries shallow, intermediate and deep focus The inclined zone of seismic activity produced by the interaction of the downgoing, subducting, oceanic plate beneath an overriding continental or oceanic plate.
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