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Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Maug Islands
An aerial view of the Maug Islands from the NE shows Kitashima (North Island) at the right margin, Higashishima (East Island) in the foreground, and Nishishima (West Island) in the background. The islands enclose a 2.5-km-wide submarine caldera containing a lava dome that rises to within about 20 m of the ocean surface. Photo by Dick Moore, 1990 (U. S. Geological Survey).
Volcano Number:
284143
Volcano Name:
Maug Islands
Country:
United States
Volcano Type:
Stratovolcano
Elevation:
227m
Tectonic Setting:
Subduction zone / Crustal thickness unknown
Latitude:
20.02
Longitude:
145.22
Details
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Three small elongated islands up to 2.3 km long mark the northern, western, and eastern rims of a largely submerged 2.5-km-wide caldera. The highest point of the Maug Islands reaches only 227 m above sea level; the submerged southern notch on the caldera rim lies about 140 m below sea level. The caldera has an average submarine depth of about 200 m and contains a twin-peaked central lava dome that rises to within about 20 m of the sea surface. The Maug Islands form a twin volcanic massif with Supply Reef, about 11 km N. The truncated inner walls of the caldera on all three islands expose lava flows and pyroclastic deposits that are cut by radial dikes; bedded ash deposits overlie the outer flanks of the islands. No eruptions are known since the discovery of the islands by Espinosa in 1522. The presence of poorly developed coral reefs and coral on the central lava dome suggests a long period of general quiescence, although it does not exclude mild eruptions (Corwin, 1971). A 2003 NOAA expedition detected possible evidence of submarine geothermal activity.
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Eruption Data from the Global Volcanism Program of the Smithsonian Institution
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Emissions Data from the Global Volcanism Program of the Smithsonian Institution
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Data from the Earthchem Library
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Data from the Earthchem Portal
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Data from the SESAR Database
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Data from the MaGa Database
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Data from UNAVCO
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Data from USIEI
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Data from IRIS FDSNWS
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