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- W2002247923 abstract "The short-period seismic phase Sn has been interpreted by Stephens & Isacks as a ‘lid wave’ in which the seismic energy is constrained to the uppermost few tens of kilometres of the mantle. We have extended their normal-mode interpretation for structures both with and without low-velocity zones (LVZ) in the upper mantle. We have used spherical, anelastic models of the Earth. For a model of an oceanic mantle with a LVZ, we agree that Sn is a lid wave for sources above 200–250 km, if only the onset of Sn is considered. The later portions of the Sn wave train sample the structure as deeply as the 420-km discontinuity. For deeper foci, the pseudo-lid wave does not appear to be generated; even the onset of Sn samples the deeper mantle structure. For a model of a continental mantle without a LVZ, in general, sources at all depths above the 420-km discontinuity appear to generate teleseismic Sn which samples the entire mantle as deeply as the discontinuity and which travels with a velocity significantly greater than the lid velocity. Thus the velocity of Sn may be an important diagnostic to determine whether or not a LVZ exists in the upper mantle." @default.
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- W2002247923 date "1977-12-01" @default.
- W2002247923 modified "2023-09-26" @default.
- W2002247923 title "Teleseismic Sn: a guided wave in the mantle" @default.
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- W2002247923 doi "https://doi.org/10.1111/j.1365-246x.1977.tb04216.x" @default.
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