Abstract
Accurate models of the distribution of heterogeneities in the Earth's
mantle, especially of subduction zones, are crucial for our understanding
of the composition and dynamics of the Earth. Here we present broad-band
(BB) seismograms with P-waves reflected at the subduction zone under
southern Japan at about 84 deg distance from German Regional Seismic
Network. The earthquakes occurred in the Mariana Islands region at
100 deg to 105 deg distance. Array techniques allow the separation
of this wave with an asymmetric path (P1P2) from reflections and
conversions under the source, the receivers and the midpoint between
the source and the receivers. Our observation demonstrates that subduction
zones can act as strong seismic reflectors and can be mapped with
a depth resolution of +-20km with BB arrays at teleseismic distances.
The analysis of such data will help to derive a more detailed picture
of the structure of the Earth's mantle.
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