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Lect_1_Intro - Course Summary 1994 M6.7 Northridge...

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Course Summary
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1994 M6.7 Northridge earthquake, California
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Another building destroyed by the 1994 Northridge earthquake
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Devastation from 1995 M7.2 Kobe earthquake, Japan
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Whole neighborhoods were destroyed in the 1999 M7.4 Izmit earthquake in Turkey. More than 17,000 people were killed in this earthquake.
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Earthquakes can trigger tsunamis. This destruction was caused by the tsunami triggered by the 1964 M9.2 Alaskan earthquake.
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Many low-lying towns were destroyed by the tsunami triggered by the 1998 M7 Papua New Guinea earthquake
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Geologic Time
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Geologists use cross-cutting relationships to determine relative age of events. So, in this picture, (1) layers A-J were emplaced (A being the oldest, J the youngest), then (2) the pluton and dike intruded into these layers, and finally (3) the fault formed, creating an offset in the layers and the dike.
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Geological Time Scale Originally, a relative time scale (only knew if a rock was older or younger than some other rock - didn’t know actual ages in years) Based on fossil record.
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