Ocean Boulevard Landslides

Landslide definitions

GrabensA graben is a down-dropped block between

two scarps. They often form within the bodies of rotational landslides.

Head ScarpThe head scarp is at the top of a landslide.

Structures and utilities that cross these structures may be deformed or broken by landslide movement.

Landslide Toe

The toe is the bottom of the landslide. It is

often marked by a bulge or mound.

Along Ocean Blvd, the landslide toe is

constantly eroded by the ocean.

UtilitiesUtilities along Ocean Blvd include electrical, telephone,

water, and sewer. The arrows show utility poles that are moving because they are in the body of a landslide.

Underground Utilities

Movement on the head scarp has

caused damage to local water and

sewer lines, particularly east of

the Distillery.

Evidence of Recent Movement

scarp lines shown with tick-marks on down-dropped side

landslide locations are approximate, shown as head scarp only

Future MovementThe landslides now affecting Ocean Boulevard will continue to move.

The toes of these failures are continually being eaten away by the ocean,

which means the slope cannot reach equilibrium.

Future GrowthThe landslides along Ocean

Boulevard will probably continue to grow and change.

The head scarps will migrate inland, and the bodies of the slides may expand laterally.

The ocean bluff will continue to retreat, sometimes in the

form of large slumps.

Seismic ground shaking and/or the introduction of

significant amounts of water into these landslides may accelerate these changes.

cracks opening inDistillery’s upper parkinglot

old foundation erodingfrom below