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Science 27 August 1999:
Vol. 285. no. 5432, pp. 1365 - 1366
DOI: 10.1126/science.285.5432.1365
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Perspectives

Also see the archival list of Science's Compass: Enhanced Perspectives

GEOPHYSICS:
Enhanced: A Seismic Look Under the Continents

Karen M. Fischer [HN13] and Rob D. van der Hilst [HN14]

So-called continental keels extend 250 to 350 kilometers below continents. Recent seismic arrays studies have provided insights into the origin and evolution of these fast wave speed features. The studies have shown that the keels are much more diverse than previously thought on the basis of sparser data sets. Global generalizations regarding keel properties and processes should therefore be viewed with considerable caution.

K. M. Fischer is in the Department of Geological Sciences, Brown University, Providence, RI 02912, USA. E-mail: karen_fischer{at}brown.edu. R. D. van der Hilst is in the Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. E-mail: hilst{at}mit.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)