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Don Joao de Castro Bank volcano

Submarine volcano -13 m / - 43 ft
Azores, Portugal, 38.23°N / -26.63°W
Current status: normal or dormant (1 out of 5) | Reports
Don Joao de Castro Bank volcano books
Typical eruption style: unspecified
Don Joao de Castro Bank volcano eruptions: 1720 
TimeMag. / DepthDistanceLocation
Sat, 11 Jul 2020
Sat, 11 Jul 10:44 UTCM 4.3 / 10 km28 kmAzores Islands, Portugal
Sat, 4 Jul 2020
Sat, 4 Jul 02:54 UTCM 2.025 kmS Banco D. Joao de Castro (Portugal)
Wed, 24 Jun 2020
Wed, 24 Jun 14:47 UTCM 2.818 kmSE Terceira (Portugal)
Wed, 24 Jun 03:23 UTCM 2.328 kmSE Terceira (Portugal)
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Background:

Don Joao de Castro Bank is a large submarine volcano that rises to within 13 m of the sea surface roughly halfway between Terceira and San Miguel Islands. Pillow lavas form the base of the volcano, which is capped by basaltic hyaloclastites. A submarine eruption during December 1720 produced an ephemeral island that attained a length of 1.5 km and an altitude of about 250 m before it was eroded beneath the sea surface two years later. The volcano (also spelled Dom Joao de Castro) was named after the Portuguese hydrographic survey vessel that surveyed the bank in 1941. Two youthful parasitic craters, one tephra covered and the other sediment free, are located on the NW flank. The submarine volcano has an impressive shallow fumarole field and remains seismically active.
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Smithsonian / GVP volcano information


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