Earthquakes 14

Earthquakes 14 - Earthquakes 14 October 30, 2007 ML, MS,...

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Earthquakes 14 October 30, 2007 M L , M S , M B , M w , M D Richter Magnitude – always measures energy at one frequency - Richter magnitude = local magnitude = M L   - Still sometimes used to define “size” of small, local earthquakes - Wood-anderson seismograph, used to measure shear wave amplitude at 1 sec. period. - Good for measuring energy typically released by relatively small earthquakes but, - Above about magnitude 6.5, the Richter scale starts to saturate, stops being a good  measure of how big the earthquake is.  - M L   does a poor job of measuring the “true size” of larger earthquakes that release more  low frequency energy.  - Richter actually measured the smallest S wave he could consistently measure he  arbitrarily assigned to be local magnitude 0.  - He borrowed the logarithmic aspect of scale from astronomy. -
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This note was uploaded on 01/23/2009 for the course GEOL 240Lxg taught by Professor 12:30-01:50pm during the Fall '07 term at USC.

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Earthquakes 14 - Earthquakes 14 October 30, 2007 ML, MS,...

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