A simple question about one seismogram can open the door into the wonderful world of wave propagation. Seismographs in North America are far away from earthquakes that occur in the subduction zone along Indonesia, and thus the first arrivals from these events will be core phases—P waves that have traveled through the Earth's core. On 7 August 2000, there was a fairly large (Mw = 6.5) deep earthquake beneath the Banda Sea region of the Indonesia arc. This deep event is notable in producing sharp single-pulse P-wave seismograms (for example, see the source time function at...

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