Lecture 10

Lecture 10 - many seismometers. Some of those rays pass...

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Refraction Reflection Refraction and Reflection of beams of light in a fish bowl
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Refraction and Reflection of beams of light in a fish bowl i R i >i c r r Total internal reflection
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Homogeneous Earth
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Earth with uniformly increasing seismic velocity toward the center.
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Earth with increasing seismic velocity toward the center and discrete layers.
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Fig. 19.3 P-and S-wave Pathways Through Earth Earthquake
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P-wave and P-wave and S-wave S-wave velocities velocities reveal the reveal the structure of structure of earth's earth's interior interior
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Structure of the Crust and Upper Mantle Fig. 19.7
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Isostacy Less dense crustal rocks float on denser mantle rocks.
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Crustal root Crust Mantle
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Model of Isostasy
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The less dense crust “floats” on the less buoyant, denser mantle Fig. 19.6 Mohorovicic Discontinuity (Moho)
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Changes in P- wave and S-wave velocity reveal Earth’s internal layers
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Seismic Tomography Seismic Tomography One earthquake sends out many rays (many wave paths) that are recorded at
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Unformatted text preview: many seismometers. Some of those rays pass through an anomalous zone, affecting their arrival times at distant seismometers. However, there is not enough information to pin down the location and configuration of the anomalous zone. Many earthquakes send out many rays to many seismometers providing enough information to pin down the location and configuration of the anomalous zone. Seismogram Seismogram A seismogram is a recording of the ground motions at a particular location due to the passage of seismic waves generated by an earthquake. The recording can be make by a single self-contained unit called a seismograph, or by a more complex system of remote detectors, electronic amplifiers, transmission lines, and modern digital computers. Seismogram Seismogram Seismogram...
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This note was uploaded on 01/11/2010 for the course GEOL 240Lxg at USC.

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Lecture 10 - many seismometers. Some of those rays pass...

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