Oceanic Pn/Sn Phases: A Qualitative Explanation and Reinterpretation of the T-Phase.
HAWAII INST OF GEOPHYSICS HONOLULU
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The combined effects of 1 differing efficiencies between Pn and Sn energy transmission across the basement-sediment interface 2 ocean surface reflections 3 Pn to Sn conversions and, 4 large lateral variations in the crust and upper mantle are used to formulate a working hypothesis which appears to explain, qualitatively, many observations of high-frequency PnSn phases throughout the western, northern, and central Pacific. Also, the concept of PnSn phases as sources of energy at the basement-sediment interface is suggested as a possible mechanism for T-phase generation through scattering or Stoneley wave generation. Author