National Geographic : 1962 Jul
Molten rock belches from Mazama's throat, setting the stage for an awesome collapse T HOUGH explosions blew away part of the lanches. The magma also found subterranean chan peak, much of it vanished into a void within nels and drained away, creating a chamber in the the mountain itself (diagrams, above). As eruption heart of the mountain. Then the summit, its props followed eruption, fiery magma deep in the vol- weakened, tumbled into the vast cavity. Geologists 130 cano's throat escaped and formed glowing ava- believe the collapse took only a few days. DIAGRAM BY J. E . BARRETT; KODACHROMEBY WALTERMEAYERSEDWARDS,NATIONAL GEOGRAPHICSTAFF © N.G.S.