Nicaragua Migration Image MARGINSTUCAN 20046

1
Nicaragua Migration ImageMARGINS/TUCAN 2004-6
(MacKenzie et al., submitted, 2009)
Moho
fast
slab surface
dVs/Vs
slow
et al Abers, Rondenay, Fischer
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Conversion widths in stacked receiver functions
(MacKenzie et al., submitted, 2009)
Receiver functions
Back-arc Moho
w 1.9 s Rmax 7-8 km
w 1.6 s Rmax 5-8 km
Compositional?
w 6.1 s Rmax17-30 km
Thermal?

• Sharp discontinuities or gradients?
• (compositional or thermal?)

w
lag from conversion, sec
R 1/2fmx?T max. width of boundary,
km
Blue data stack .03-1 Hz Red best-fit Gaussian