Lecture16_deepearth - Fig. 20-3 Seismograms (above) and...

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Fig. 20-3
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Seismograms (above) and time-distance graph (below)
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Measuring the time intervals between arrivals of P, S, and L seismic waves.
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Avoiding error no. 1: transfer a time interval of minutes on the seismogram to the same number of minutes (not inches) on the time-distance graph.
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Correct!
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Avoiding error no. 2: place the beginning of the time intervals between P, S, and L arrivals on the P curve. This point in time refers to the arrival of P at a distant station, not to the time of the earthquake.
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Correct!
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Analysis of P, S, and L arrivals provides distance, but not direction of a seismometer station from an earthquake. Mutual intersections of at least 3 station-to-quake distances (radii of circles) locates the earthquake. CHAPTER 20
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Parts of the Earth Oceanic and continental Crust Mohorovičić discontinuity (Moho) Lithosphere and Asthenosphere Upper and Lower Mantle (transition zone)
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Mohorovičić discontinuity the boundary between the Earth's crust and the mantle lies entirely within the lithosphere 5 - 10 km below the ocean floor and 20 - 90
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This note was uploaded on 07/07/2010 for the course GEO geo taught by Professor Long during the Spring '10 term at University of Texas at Austin.

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Lecture16_deepearth - Fig. 20-3 Seismograms (above) and...

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