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Understanding Tsunami Warnings: Epicenter Location and Arrival Time Calculation

This exercise explores tsunami warnings by analyzing a seismogram from a coastal region. Participants will learn how to determine the time lag between primary and secondary waves, which is crucial for locating the epicenter of an earthquake. Using this information, we will calculate the distance to the epicenter and forecast the tsunami's arrival time. This hands-on math problem emphasizes the importance of seismological data in disaster preparedness and public safety.

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Understanding Tsunami Warnings: Epicenter Location and Arrival Time Calculation

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Presentation Transcript

  1. Tsunami Warning

    Locating an epicenter and forecasting a tsunami arrival time . . .
  2. A math problem . . . Suppose you receive a seismogram from a coastal region that looks like the one on the board. What is the time lag? How far away is the epicenter? How much time do you have before a tsunami could possibly arrive?
  3. Get out the maps . . . In the folder (for the appropriate map) are three seismograms for a large (Magnitude 8.0) earthquake with its epicenter in the ocean. Locate the epicenter. Then, forecast the arrival time of a tsunami at a specific destination (that I’ll give you after you locate the epicenter correctly). The arrival time is the travel time of the tsunami MINUS the time taken to receive the S-Wave.
  4. Clean up . . . Please clean up the map. Also, get all materials put away (or back where you found them). Give me your folders. Give me your answer sheets.
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