Late one recent night I realized that building a seismic detector
for my location may be a waste of time.

    The airport is realitively close to the town, and that night the
departing aircraft were flying over the town.  Some of the larger
aircraft rattle the windows, and shake the house.  Is this type of
vibration likely to be detected on a seismograph?

    Ron (in Gander, Newfoundland)

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