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Geol105_Lecture_07

Geol105_Lecture_07 - GEOL 105 Lecture 07 Prof Jonathan Lees...

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GEOL 105 Lecture 07 Prof. Jonathan Lees http://www.nws.noaa.gov/sat_tab.php
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Earthquake Intensity Mercalli Scale Variables Earthquake magnitude Distance from hypocenter/epicenter Foundation materials Building style Duration of shaking
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Mercalli Intensity Scale Mercalli Intensity(at epicenter) Magnitude Witness Observations I 1 to 2 Felt by very few people; barely noticeable. II 2 to 3 Felt by a few people, especially on upper floors. III 3 to 4 Noticeable indoors, especially on upperfloors, but may not be recognized as an earthquake. IV 4 Felt by many indoors, few outdoors. May feel like heavy truck passing by. V 4 to 5 Felt by almost everyone, some people awakened. Small objects moved. Trees and poles may shake. VI 5 to 6 Felt by everyone. Difficult to stand. Some heavy furniture moved, some plaster falls. Chimneys may be slightly damaged. VII 6 Slight to moderate damage in well built, ordinary structures.
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