Upper mantle structure of northwestern Eurasia

  title={Upper mantle structure of northwestern Eurasia},
  author={Jeffrey Wi Given and Donald V. Helmberger},
Long-and short-period WWSSN seismograms from nuclear explosions in the Union of Soviet Socialist Republics are incorporated with apparent velocity observations to derive an upper mantle model for northwest Eurasia. The compressional waves from these explosions have several distinctive features that provide important new information about the character of the upper mantle in the region. The seismograms from 9° to 13° exhibit impulsive first arrivals Pn, implying a smooth, positive velocity… CONTINUE READING

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