Abstract
MOST P signals from underground explosions are simple1, consisting of a single pulse of 2 to 3 cycles followed by a tail or coda of relatively low amplitude arrivals which may be explained in terms of reflexions in the crust and upper mantle at the explosion epicentre or at the receiver. Some complex signals have been recorded from underground explosions (see, for example, ref. 2) ; these signals contain arrivals which have amplitudes similar to or greater than the direct P and which are as much as several tens of seconds later than the first arrival.
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DOUGLAS, A., MARSHALL, P. & CORBISHLEY, D. Absorption and the Complexity of P Signals. Nature Physical Science 233, 50–51 (1971). https://doi.org/10.1038/physci233050a0
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DOI: https://doi.org/10.1038/physci233050a0
