Unformatted text preview: discontinuity is confirmed in this region and the deflections of 660 and 410 km are studied. The underside reflection P660P that was recently considered to be absent is visible with the migration method in these regions. The results show that the 660 km discontinuity seems to be lowered up to 40 km whereas the 410km discontinuity seems to be only slightly raised near subduction areas and the data show laterally varying topography on all observed discontinuities. Using the depths of the discontinuities we are attempting to constrain the temperature within and in vicinity of the slabs. The 520 km discontinuity is detected in the whole dataset and seems to be much lower in our studied region. In addition discontinuities at 220 and 350 km are observed....
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- Spring '08
- Southwest Pacific, km discontinuity, upper mantle discontinuities