Atlantic Margin Images
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- New England Seamount Chain Perspective #1
- New England Seamount Chain Perspective #2
- Oceanographer Canyon System
- Knauss Seamount
- Hudson Canyon
- Toms Canyon
- Hatteras Transverse Channel
- Carolina Slope
- Blake Spur
- Blake-Bahama Outer Ridge
- Cape Fear and Lookout Slides Perspectives and Profiles
Perspective color-relief view of the western part of the New England Seamount chain. See b in image 2 for seamount names. Background grid is from ETOPO2 dataset. Notice the large landslides in the foreground. Vertical exaggeration 10x.
Map view of color relief of the western New England Seamounts and adjacent upper continental rise. Seamounts include Bear Smt (a), Physalia Smt (b), Retriever Smt (c), Balnus Smt (d) and Mytilus Smt (e), f is Oceanographer Canyon channel. Black dashed line is approximate limit of mass-failure deposits.
Perspective color-relief view of a portion of Oceanographer Canyon system. This view shows the junction of two canyon channels, both of which are incised into an older "flood plain". The channel on the left (labeled "a") is a hanging valley with a 10 m drop-off to channel "b". Each canyon is incised about 50 m deep. Vertical exaggeration 20x.
Perspective color-relief view of Knauss Seamount. The summit depth of the seamount is 2968 m. The bold white line is the 4100 m isobath, light white line is 4200 m isobath. Note the sediment banked against the back of the seamount, a result of the strong Western Boundary Current with a flow direction from the lower right to the upper left in this image. Vertical exaggeration 10x.
Perspective view of the bathymetry of a portion of the continental margin centered on Hudson Canyon. Notice the sinuous path of the channel and the incised thalweg. Channels labeled "a" and "b" appear to be formed by springs because they have no landward continuity with any channel. Channels labeled "c" have landward continuity with shallow channels (see perspective view in image 6. Vertical exaggeration 10x.
Perspective color-relief view of the Toms Canyon system. The head of the channel is an amphitheater of numerous canyons that coalesce to form a single channel downslope. Note the levees on either side of the main canyon channel. The levee on the right side of the channel has more than 100 m of relief. Compare the constructional levees on the upper rise to the eroded levees on the lower continental rise. The channels directly above Knauss Seamount and the rubble field (dashed black line) have landward continuations with shallow channels (dashed red lines). The rubble field terminates three of the four channels.
Perspective view of Hatteras Transverse channel looking N. Vertical exaggeration 15x. The channel is 3 to 4 km wide and ranges in incision depth from 120 to 250 m. The large landslide completely blocks the channel with a deposit that rises 12 m above the channel floor. Landslide scars are common along the entire length of Hatteras Transverse channel. The bedforms have wavelengths of 4 to 5.5 km and heights of ~100 m. The cascade has a relief of 35 m.
Perspective view of the bathymetry looking directly toward the Carolina margin. These channels are very steep sided (18° slopes) and deep (~250 m) The channels occur on a section of the lower continental margin with a slope of 0.6°. Note the ~15 km spacing between channels. Vertical exaggeration 15x.
Perspective view of the bathymetry of Blake-Bahama Outer Ridge (BBOR). Blake Spur is in upper left background. Slopes on BBOR are ~2° facing viewer and ~1° facing left and away from viewer. White arrow points to dish-shaped surface of western end of BBOR where depths in the middle of dish are 200 m deeper than on the edges. Bedforms toward top of image have wavelengths of ~1000 m and wave heights of ~25 m whereas bedforms in middle of image have wavelengths of ~2000 m and wave heights of ~25 m. Both sets of bedforms are oblique to the contours. Linear trends that parallel those indicated by red arrows are artifacts. Vertical exaggeration 15 x, looking west.
Perspective view of the bathymetry of Blake Spur. Blake-Bahama Outer Ridge (BBOR) in upper right background. Bedforms occur on a plateau built to the SW of BBOR. Bedforms have wavelengths of ~5000 m and wave heights up to 100 m. An erosional moat 50 m deep is found around the base of Blake Spur. Linear trends that parallel those indicated by red arrows are artifacts. Vertical exaggeration 15x, looking NW.
Perspective view of bathymetry (top) and acoustic backscatter (bottom) of the area encompassing the Caper Fear and Cape Lookout Slides as well as Hatteras Transverse Canyon depositional lobe. Notice that there is very little or no bathymetric expression for the two slide deposits or the depositional lobe. However, there are very pronounced backscatter responses to the three depositional features (yellow, red and white dashed outlines).
11b. Cape Fear and Lookout Slides Profiles
Perspective view of acoustic backscatter draped onto bathymetry showing the Cape Fear and Cape Lookout Slides and the depositional lobe of Hatteras Transverse Canyon. The high backscatter (bright) of the Cape Fear Slide compared to the medium backscatter of the Cape Lookout Slide reflects the different lithologies that make up the slide material. The profile A-B shows toe of the Cape Fear has very little relief, similar to that of the Hatteras Transverse Canyon depositional lobe(profile C-D). Both profiles are at the same horizontal and vertical scales.