English: S-wave velocity near Earth's surface for three tectonic provinces: TNA = Tectonic North America SNA= Shield North America ATL = North Atlantic
Français : Vitesse de propagation des ondes S dans le manteau supérieur, dans trois régions typiques : TNA = province tectonique nord-américaine, SNA = bouclier nord-américain, ATL = Atlantique Nord
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Patterned after Don L. Henderson (2007) New Theory of the Earth (2nd ed.), Cambridge University Press, p. 102, Figure 8.6 ISBN: 0521849594. and attributed to Grand & Helmberger (1984).
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