Earthquakes Chpt. 6

Earthquakes Chpt. 6 - Earthquakes Northridge CA 17 Jan 1994...

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9/30/11 Earthquakes Northridge, CA, 17 Jan 1994
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9/30/11 @ usgs.gov
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9/30/11 Earthquakes Approx. >2 million earthquakes worldwide occur each year Most not felt
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9/30/11 Where do earthquakes occur? Along faults At all boundary types Intraplates New Madrid Seismic Zone Swarm 1811-1812 Ottawa – Quebec Eq on Sunday
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9/30/11 Fault Block Diagram Focus = point along fault where movement first occurs Foc us Fau lt Epicenter = point on surface dircectly above focus Epicent er
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9/30/11 Comparing Earthquakes Magnitude Amount of energy released Richter scale Not useful for earthquakes >5 Moment magnitude Strength of rock Area of rupture Distance of displacement Intensity Amount of ground shaking
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9/30/11 Comparing Earthquakes Single earthquake 1 magnitude Many intensities Soft ground shakes more than hard ground
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9/30/11 What happens when earthquake occurs?
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9/30/11 When earthquake occurs Energy released Moves through Earth as waves Called seismic waves
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9/30/11 Seismic waves
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9/30/11 Seismic waves Different types of seismic waves Compressional waves (P-waves) Shear waves (S- waves) Surface waves Love Rayleigh
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9/30/11 Seismic waves
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9/30/11 Seismic waves
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Click to edit Master subtitle style 9/30/11 Earthquakes detected on seismographs How do we know where a single earthquake occurred?
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9/30/11 Locating earthquakes Need three seismographs Triangulate using distances
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9/30/11 Earthquake epicenter Locating an earthquake 400 km 300 600 Km X
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9/30/11 What are the hazards?
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9/30/11 Earthquake Hazards and Humans
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Earthquakes Chpt. 6 - Earthquakes Northridge CA 17 Jan 1994...

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