Mantle Discontinuity Structure Beneath the Southern East Pacific Rise from P-to-S Converted Phases
Yang Shen,
*
Anne F. Sheehan,
Kenneth G. Dueker,
Catherine de Groot-Hedlin,
Hersh Gilbert
Receiver functions derived from teleseismic body waves recorded by
ocean-bottom seismometers on the southern East Pacific Rise reveal
shear waves converted from compressional waves at the mantle
discontinuities near 410- and 660-kilometer depth. The thickness of the
mantle transition zone between the two discontinuities is normal
relative to the global average and indicates that upwelling beneath the
southern East Pacific Rise is not associated with an excess temperature
in the mantle transition zone.
Y. Shen, Department of Geology and Geophysics, Woods Hole
Oceanographic Institution, Woods Hole, MA 02543, USA.
A. F. Sheehan, K. G. Dueker, H. Gilbert, Cooperative
Institute for Research in Environmental Sciences (CIRES), University of
Colorado, Boulder, CO 80309, USA.
C. de Groot-Hedlin, Scripps Institute of Oceanography, La Jolla, CA
92093, USA.
*
To whom correspondence should be addressed: E-mail:
yshen{at}whoi.edu
