The figure shows a seismic tomography profile carried out in a sector of the Pacific. Explain what the seismic tomography tech- nique consists of, and how the tomographic section shown is in- terpreted in the context of plate tectonics (the circles represent earthquakes). Depth (km) 0 100 200 300 400 500 600 700 P-wave Tomography Fiji Tonga Lau Spreading Arc Center co -6% P-wave velocity anomaly Pacific Plate +6%

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