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Characteristics of seamounts near Hawaii as viewed by GLORIA
Bridges, Nathan T.
Marine geology, 1997-05, Vol.138 (3), p.273-301
[Periódico revisado por pares]
Headquarters: Elsevier B.V
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Título:
Characteristics of seamounts near Hawaii as viewed by GLORIA
Autor:
Bridges, Nathan T.
Assuntos:
GLORIA sonar
;
Hawaii
;
Musicians seamounts
;
North Arch lava flow
;
Oceanography
;
Seamounts
É parte de:
Marine geology, 1997-05, Vol.138 (3), p.273-301
Notas:
HQ
NAS 1.26:207247
NASA/CR-96-207247
Headquarters
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição:
Using images and data acquired from the GLORIA sonar system, 390 seamounts within the U.S. Hawaiian Exclusive Economic Zone (HEEZ) off Hawaii have been studied. Their diameters range from 1 to 57 km, with most less than 15km. Seamount abundance increases exponentially with decreasing size. The areal density of observed seamounts having diameters greater than 1 km is 182 10 6km 2 . The theoretical abundance of seamounts of all sizes normalized to a unit area is (309 ± 17) 10 6 km 2 , about an order of magnitude less than other surveyed areas of the Pacific. This may reflect a lower abundance of Cretaceous seamounts in this region, the covering of small seamounts by sediment, or discrepancies from the use of different data sets to derive the abundance statistics. The seamounts have morphologies ranging from steep-sided, flat-topped structures to cones to more amorphous structures; they are similar to volcanoes found elsewhere on the seafloor. A suite of secondary features associated with the seamounts includes summit craters, summit mounds, coalesced boundaries, landslides, and graben. Several seamount chains are aligned parallel to Cretaceous fracture zones, consistent with an origin close to the ancestral East Pacific Rise. Others are aligned parallel to the Necker Ridge, suggesting that they formed contemporaneously with Necker in the plate interior. This observation, together with high abundances of seamounts where other intraplate igneous processes have occurred, suggests some seamounts formed since leaving the spreading center.
Editor:
Headquarters: Elsevier B.V
Idioma:
Inglês
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