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Collapse of Santa Ana volcano during the late Pleistocene produced the voluminous and extremely mobile Acajutla debris avalanche, which traveled ∼50 km south into the Pacific Ocean, forming the broad Acajutla Peninsula. The subaerial deposit covers ∼390 km2; inclusion of a possible additional ∼150 km2 submarine component gives an estimated volume of 16 ± 5 km3. Hummocks are present to beyond the coast-line but are most prominent in four clusters corresponding to the location of buried bedrock ridges. Bulking in distal portions incorporated accessory Tertiary-to-Quaternary volcaniclastic rocks and ignimbrites. Modern Santa Ana volcano was constructed...

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