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Katmai National Park, Alaska. The great 1912 eruption of Novarupta Volcano covered the flanks of Katmai Volcano with thick ash falls still visible in this photo taken from a light plane 51 years later. The summit of Katmai collapsed into a caldera (off to the right side) as magma was removed from beneath the peak. Trident volcano (center) was erupting a lava dome and andesite flow.
                                               Photo copyright R.W. Decker, 1963

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