34 - DIAGRAM 2 -Waves speed up as they go down-Ray goes...

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20:34 Baja Earthquake – Oct 21, 2010 = Right lateral strike slip 6.9 Mg.  Read Chapter 5  Seismometer Basis of most seismometers is a Pendulum DIAGRAM 1 It will leave a trace of how the ground moves Seismic Observatories Each seismic observatory contains: Short-period instrument  (T ~/sec) (high frequency waves=short period waves)  –designed to record body waves (P,S waves) Long-period instrument  (T ~20-100sec) –designed to record surface waves For each type of instrument, there are three components: 1-vertical (measures up and down motion) The recording of an Earthquake on each of the component in instruments: 
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Unformatted text preview: DIAGRAM 2 -Waves speed up as they go down-Ray goes from low velocity to high velocity which makes it refract and head toward the interface-TELESEISM- (Distant EQ) due to different velocities of P,S, and surface waves, different wave phases arrive at different times The bottom wave gets to the seismic observatory the fastest because it travels faster (like taking the freeway) even though the top one seems like a shorter distance (it travels slower) Local Event (< 10 -20 km/s) DIAGRAM 3 All wave phases arrive almost simultaneously 20:34 20:34...
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This note was uploaded on 10/26/2010 for the course GEOL 240Lxg at USC.

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34 - DIAGRAM 2 -Waves speed up as they go down-Ray goes...

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