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Tutuila volcano

Tuff cones 653 m / 2,142 ft
United States, Samoan Islands, -14.3°S / -170.7°W
Current status: normal or dormant (1 out of 5) | Reports
Tutuila volcano books
Typical eruption style: unspecified
Tutuila volcano eruptions: unknown, no recent eruptionsNo recent earthquakes
TimeMag. / DepthDistanceLocation

Background:

The elongated, extensively eroded Tutuila Island in the center of the Samoan Islands consists of five Pliocene-to-Pleistocene volcanoes constructed along two or three rifts trending SSW-NNE. The Pago basaltic-to-andesitic shield volcano in the center of the 32-km-long island is truncated by an eroded, 9-km-wide caldera that encloses Pago Pago harbor on its west side. The caldera is now partially filled by cinder cones and trachytic lava domes. ENE-trending dike complexes are prominently exposed on Pago volcano. Following a lengthy period of erosion, submergence, and the construction of a barrier reef, the Leone volcanics were erupted during the Holocene along a 5-km-long N-S-trending fissure over a broad area at the southernmost part of the island (Stearns, 1944), forming a group of initially submarine tuff cones and subsequent subaerial cinder cones that produced fresh-looking pahoehoe lava flows.
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Smithsonian / GVP volcano information


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