Moloka`i Survey
The Moloka`i survey shows the headwall of the giant Wailau landslide (Moore et al., 1989, 1994). The break-in-slope is the headwall of the slide, which is seen to be quite irregular due to secondary slumping (Clague et al., 1998). The gently-sloping platform above the headwall is cut by numerous submarine canyons and, to the west, a meandering stream channel, all probably carved when this area was still above sea level.
Plunge pools are present at the distal end of many of the canyons below the break-in-slope. A single volcanic cone and flow are present in the central part of the gently-sloping platform above the break-in-slope. This cone and flow are apparently young (they have high backscatter in the sidescan data indicating thin sediment cover) and probably erupted during the rejuvenated stage that formed the Kalauapapa Peninsula between 370,000 and 540,000 years ago (Clague et al., 1982). Below the headwall a single rotational slump block has moved away from the headwall and diverted subsequent sediment flow around the block to the east. The oblique view below shows the area from the north with the islands of Moloka`i, Maui, Lana`i, and Kaho`olawe in the background.
The oblique views show the area from the north with the islands of Moloka`i, Maui, Lanai, and Kaho`olawe in the background. The second oblique is a close-up of some of the canyons and the offshore rotated slump block.
