08_31_Earthquake

08_31_Earthquake - effects-Mercali Intensity Scale These...

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EARTHQUAKES: GEOLOGIC AND SOCIAL PERSPECTIVES ES10 Introduction to Environmental Sciences
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Earthquakes concentrated in certain zones ± boundaries between rigid plates.
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Gondwanaland and its breakup
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7KH#µIRFXV¶#+ focal point ) is where rupture along the fault begins, and from which seismic waves emanate outward. 7KH#SRLQW#RQ#WKH#HDUWK¶V#VXUIDFH#DERYH#WKH#IRFDO#SRLQW is the epicenter .
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How a seismograph works
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Richter Magnitude -amplitude of ground motion produced by earthquake at a standard distance from the epicenter -logarithmic scale -Energy released goes up 30 x with each unit Contrast with Intensity -a measure of earthquake
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Unformatted text preview: effects-Mercali Intensity Scale These Santa Cruz mountain residents were briefly famous for the crack in their driveway in Oct 1989 When our environmental geology class visited two weeks later, the crack had been filled ± \RX¶G#QHYHU#NQRZ$##%XW#LI#\RX#WXUQHG#DURXQG« The crack was still there. It continued under the road. The crack created a 1-ft dropoff in the road surface. Note the apparent left-lateral offset. This reflects local shifting of blocks relative to one another, not the sense of fault movement. Landslides triggered by the 1987 earthquake in the Andes of Ecuador...
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08_31_Earthquake - effects-Mercali Intensity Scale These...

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