Lecture 12

Lecture 12 - A travel time curve is a plot of time versus...

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A travel time curve is a plot of time versus distance for a particular phase. From the recordings made by a large number of stations for many earthquakes, one can construct a travel-time curve for each body-wave phase. Taken together, these travel-time curves (i.e., their shapes) can be used to provide detailed information about the structure and composition of earth's interior. We also depend on travel time curves to locate earthquakes. Travel-time curves for the direct P-wave and S-wave phases, used for locating earthquake hypocenters.
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1. Measure the difference between the P and S wave arrival times (the S-P interval) from the seismogram in (A). 2. Find the S-P interval between the two travel time curves in (B). 3. Read the distance traveled from the focus in (B). 4. Repeat for two more stations.
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The red line is a seismogram from a station 3800 km from the epicenter, showing the first P-wave and first S-wave arrivals.
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Lecture 12 - A travel time curve is a plot of time versus...

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