Structure under Mount Rainier, Washington, inferred from teleseismic body waves

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書誌事項

公開日
1979-08-10
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/jb084ib09p04749
公開者
American Geophysical Union (AGU)

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説明

<jats:p>Teleseismic long‐period <jats:italic>P</jats:italic> waves recorded at the World‐Wide Standard Seismograph Network station LON (Longmire, Washington) are shown to exhibit strong anomalous particle motion not attributable to instrument miscalibration or malfunction. In particular, a large and azimuthally smoothly varying tangential component is observed after vector rotation of horizontal <jats:italic>P</jats:italic> waves into the ray direction and after application of a deconvolution technique which equalizes effective source time functions and removes the instrument response. These tangential waves attain amplitudes comparable to the radial component and demonstrate wave form antisymmetry about a NNE azimuth. A model which contains a single high‐contrast interface dipping toward the NNE at a depth of 15–20 km can explain most of the characteristics of the long‐period <jats:italic>P</jats:italic> wave data, provided dips are greater than about 10° and only the interference of <jats:italic>P</jats:italic> and <jats:italic>Ps</jats:italic> generated at the interface is considered. The model breaks down for later arrivals which are presumably multiples or scattered waves. Examination of long‐period <jats:italic>S</jats:italic> waves from several deep teleseisms shows a prominent <jats:italic>Sp</jats:italic> arrival 18 s before <jats:italic>S</jats:italic>. The timing of this phase conversion suggests an interface at about 145‐km depth, and its sense of polarity suggests that the velocity contrast is from higher to lower velocities as depth decreases. This interface may correspond to the bottom of the upper mantle low‐velocity zone in the area.</jats:p>

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