 Howland Seamount |    |
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| Index | SMNT-008N-1766W |
Classification | Small B1 Seamount |
| Location | 0º 48.61' N
176º 37.24' W |
Elongation
Irregularity | 1.30 ± 0.07
1.34 ± 0.05 |
| Plate Age | 124.6 - 125.2 Ma |
Oceanic Province | Abyssal Plain |
| Region | Tokelau Seamounts |
Alternative Names | |
| Plate | Pacific Plate |
Age | |
| Tectonic Setting | Hotspot Trail |
Seamount Top | 400 m |
| Volume | 2889 km3 |
Ocean Bottom | 4850 m |
Shelf Edge
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Volcanic Activity | Extinct |
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| | Description | | Howland Volcanic Island is located at 0¿ 48.8' N, 176¿ 37.2' W and is part of the Tokelau Seamounts on the Pacific Plate. It is 4639 m high with the top at -700 m and the ocean bottom at -5339 m. It has a volume of 8959 km3 and is fairly round with slightly irregular edges. The rifts radiate out in four predominate directions from a central peak. The first dredge for the Tokelau Seamounts was taken at Howland. Dredge AVON2-D26 was taken on the northwestern rift. Dredge AVON2-D27 was on the northeastern rift. Dredge AVON2-D28 was on the southeastern rift and dredge AVON2-D29 was on the southern rift. |
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Howland Seamount -- Multibeam data merged with predicted satellite bathymetry |
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Howland Seamount -- Multibeam bathymetry |
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Howland Seamount -- Predicted satellite bathymetry |
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Howland Seamount -- Residual bathymetry |
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Tokelau Seamounts -- Multibeam data merged with predicted satellite bathymetry |
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Tokelau Seamounts -- Multibeam bathymetry |
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Tokelau Seamounts -- Predicted satellite bathymetry |
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Tokelau Seamounts -- Residual bathymetry |
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Howland Seamount -- Multibeam data merged with predicted satellite bathymetry |
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Howland Seamount -- Multibeam bathymetry |
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Howland Seamount -- Predicted satellite bathymetry |
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Howland Seamount -- Residual bathymetry |
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Tokelau Seamounts -- Multibeam data merged with predicted satellite bathymetry |
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Tokelau Seamounts -- Multibeam bathymetry |
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Tokelau Seamounts -- Predicted satellite bathymetry |
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Tokelau Seamounts -- Residual bathymetry |
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High resolution 40Ar/39Ar ages for the Tokelau seamount trail: sample AVON2-26-40 -- graphs, spreadsheet |
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High resolution 40Ar/39Ar ages for the Tokelau seamount trail: sample AVON2-26-33 -- graphs, spreadsheet |
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High resolution 40Ar/39Ar ages for the Tokelau seamount trail: sample AVON2-27-18 -- graphs, spreadsheet |
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High resolution 40Ar/39Ar ages for the Tokelau seamount trail: sample AVON2-27-24 -- graphs, spreadsheet |
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High resolution 40Ar/39Ar ages for the Tokelau seamount trail: sample AVON2-28-10 -- graphs, spreadsheet |
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| Depth |
Azimuth |
Area |
Length |
Width |
Elongation |
Contour |
Ellipse |
Irregularity |
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| m |
degrees |
km2 |
km |
km |
ratio |
km |
km |
ratio |
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| 2180 |
158.4 |
176.8 |
18.9 |
13.8 |
1.375 |
63.1 |
48.0 |
1.314 |
| 2625 |
158.5 |
263.4 |
23.1 |
18.1 |
1.277 |
81.8 |
58.2 |
1.406 |
| 3070 |
159.3 |
366.6 |
26.1 |
20.8 |
1.252 |
89.9 |
68.5 |
1.312 |
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| 79 % Multibeam Coverage |
1.30 ± 0.07 |
1.34 ± 0.05 |
| 4450 m High |
| 1 Summit |
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