EES-1000 Lecture 21: Earthquakes

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Locating an epicenter: the point of intersection of 3 stations is the epicenter! Earthquake size: size is described by either intensity or magnitude, mercalli intensity scale- degree of shaking damage, roman numerals assigned to different levels of damage, damage diminishes in intensity with distance, damage also in uenced by underlying rock type! The lower the roman numeral the less damage: magnitude- the amount of energy released, maximum seismogram motion, normalized for distance, reported on the richter scale, earthquake energy release can be calculated! Measuring earthquake size: small earthquakes are frequent, ~100,000 with magnitude >3 / year, large earthquakes are rare, 1 with magnitude >8 earthquakes / year! Shallow focused earthquakes: shallow- 0-20 km, along the mid-ocean ridge, transform boundaries, shallow part of trenches in subduction zones! Example: haiti 2010- mg 7. 0: occurred along the left-lateral strike slip fault! Intermediate and deep earthquakes occur in subduction zones- the.

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