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The spectral content of high frequency (1-30Hz) P and S phases observed by ocean bottom seismographs (OBS's) in the Mariana basin is investigated . It is shown that autoregressive models of 10-30th order are suitable for analyzing high frequency waves. For events with S-P times greater than 50 sec, both the predominant frequency and the wave energy of observed P and S phases are confined to a narrow range, say 6-10Hz for P waves and 5.5-9Hz for S waves . In addition, high frequency phases are also characterized by their long duration. It seems likely that some intrinsic property of the oceanic crust or upper mantle allows the efficient ransmission of high frequency (5-10Hz) seismic waves. A model of the oceanic upper mantle which is consistent with the observed transmission of high frequency seismic waves is presented.

Spectral structure of high frequency P and S phases observed by OBS's in the Mariana Basin.