Geoscience Reference
In-Depth Information
Figure 9.60.
Deviations of seismic velocity from a standard model across
subduction zones of the Pacific as determined from P-wave travel times:
(a) Farallon, (b) Japan and (c) Tonga. (d) A map view of the velocity anomalies at a
depth of 145 km beneath the Tonga arc and the Lau back-arc region. Note the high
velocities of the cold subducting plate. The plate boundary and coastlines are shown
as solid lines, earthquakes as white circles. Colour versions Plate 25.(W. Spakman,
personal communication 2003.)
