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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. |
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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. |
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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. |
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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. |
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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. |
U.S. Department of the Interior |
U.S. Geological Survey
![[Perspective view index map]](images/perspix1.gif)
