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Los Angeles Margin

Perspective Views

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Click on the arrows within the index map below or go to the thumbnail images to choose a perspective view.

Los Angeles Margin perspective view index map

Perspective view of the Los Angeles Margin
Larger View

Overall perspective view of the Los Angeles Margin and Basin looking northeast. The distance across the bottom of the image is about 100 km with a vertical exaggeration of 6x. The margin is bisected by a series of large underwater canyons, channels, and gullies. Underwater landslides occur along the steep slope off the Palos Verdes Peninsula depositing large blocks (Fig. 3) into the deeper basin. Download 300dpi TIFF image (10 MB)

Perspective view of Santa Monica Bay
Larger View
Perspective view looking northeast toward the Santa Monica Mountains in northern Santa Monica Bay. The distance across the bottom of the image is about 9 km with a vertical exaggeration of 6x. Large channels (240 m wide and up to 20 m deep at "A") decrease in size from west to east as the slope gradient and height decrease. The large channels on the steep slope give way to smaller gullies (150 m wide and less than 1 m deep at "B") on the apron. The edge of Santa Monica Canyon can be seen on the far right of the image. Download 300dpi TIFF image (17 MB)
Perspective view of San Pedro Bay
Larger View
Perspective view looking north over the San Gabriel (A) and Newport (B) submarine canyons. The distance across the bottom of the image is about 17 km with a vertical exaggeration of 6x. Both canyons formed when the San Gabriel River and the Santa Ana River flowed out across the Los Angeles Basin and offshore shelf when it was exposed during lower eustatic sea level. Newport Canyon begins less than 360 m from shore at the north end of Newport Harbor and is composed of individual channels that braid down the slope over a width of about 9 km. San Gabriel Canyon begins as a series of channels that join together midway down the slope and then split into two channels at the base of the slope. The width of San Gabriel Canyon at "C" is 815 m and incises about 25 m into the slope. Lasuen Knoll can be seen in the forground. Download 300dpi TIFF image (19 MB)

Larger View
Perspective view looking east over Redondo submarine canyon in southern Santa Monica Bay. The distance across the bottom of the image is about 9 km with a vertical exaggeration of 6x. The canyon begins less than 160 m from shore just south of the Redondo Beach Harbor and incises over 420 m into the shelf (A) or about the same height as the Paloes Verdes Peninsula (440 m at B). The canyon ranges in width from 660m at its head to 3.2 km were it ends in the Santa Monica Basin. Download 300dpi TIFF image (19 MB)
Perspective view of Santa Monica Bay
Larger View
Perspective view looking southeast over Santa Monica Bay. The distance across the bottom of the image is about 9 km with a vertical exaggeration of 6x. Santa Monica submarine canyon begins in about 90 m water depth (A) and meanders down to the Santa Monica Basin. The canyon that has a width ranging from 550 to 900 m and averages 70 m of incision was created when the Los Angeles River flowed out through Ballona Gap (B) and across the shelf that was exposed above sealevel during lower eustatic sea levels. Failures can be seen along the canyon walls. The failure at "C" is 2 km long (3/4 the length of the northern runway of the Los Angeles International Airport (2.7 km)) and up to 53 m deep. Rocky outcrops protrude above the seafloor (D), some by as much as 12 m in central Santa Monica Bay in a region informally called Short Bank. Redondo Canyon (E) and San Pedro Sea Valley (F) are to the south. Download 300dpi TIFF image (16 MB)
Perspective view of Palos Verdes
Larger View
Perspective view looking southeast towards the Palos Verdes Peninsula. The distance across the bottom of the image is about 14 km with a vertical exaggeration of 6x. The vertical drop of the shelf at "A" is about 700 m, whereas the height of the Palos Verdes Peninsula at "B" is about 440 m. Large blocks can be seen on the basin floor (dark blue) that came from an underwater landslide along the walls of the San Pedro Sea Valley. The block at "C" is 325 m in length and 15 m in height. A "megaslump" (D) failed off the Los Angeles Margin slope. Download 300dpi TIFF image (16 MB)

 

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Page Last Modified: 8 September 2008 (lzt)