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SUBDUCTION ZONES 253
Figure 9.4 Gravity anomalies of an oceanic subduction zone (after Grow, 1973, with permission from the Geological
Society of America).
Figure 9.5 Vertical section perpendicular to the Tonga arc showing earthquake foci during 1965. Circles, foci projected
from within 0–150 km north of the section; triangles, from 0–150 km south. Exaggerated topography (13 : 1) above.
Inset, enlargement of the region of deep earthquakes (redrawn from Isacks et al., 1969, with permission from the
Geological Society of America).
