Contents
List of Figures
- Figure 1.
Place names near Lone Tree
landslide (right) and close up of the coast from Slide Ranch to the south end of Stinson
Beach (left).
- Figure 2.
Lone Tree landslide in February,
1971, before the earthquake.
- Figure 3.
Lone Tree landslide in September,
1990, almost a year after the earthquake and the beginning of the slide manipulation.
- Figure 4.
Lone Tree landslide in October,
1991, after completion of the landslide manipulation showing the initial development of
the slump areas on the slide fill and burial of intertidal rock.
- Figure 5.
Lone Tree landslide in November,
1992, showing cliff development on the south end of the fill, a large slump forming in
the center of the fill, and extensional cracks on the fill plateau.
- Figure 6.
Lone Tree landslide in October,
1993, showing a large slump in the central area of the fill.
- Figure 7.
Lone Tree landslide in November,
1994, showing additional slumping on the slide face.
- Figure 8.
Lone Tree landslide in May, 1995,
showing steep cliffs along the fill toe, retreat of the toe from the previously buried
intertidal rock, and better development of extensional cracks on the fill plateau.
- Figure 9.
Lone Tree landslide in June, 1994,
showing vertical cliff development on the slide toe, massive slumping from the central
slide, and erosional runnels along the northern face which all contributed to the
extensive rock armoring in the intertidal zone.
- Figure 10.
Seven topographic profiles along the
slide fill showing erosion from 1990 to 1994.
- Figure 11.
Geological hazards of the Lone Tree
slide in 1994.
- Figure 12.
Toe of the Lone Tree landslide in
June, 1990, before the slide manipulation. Looking south from the overview on the rocky
outcrop between the slide and Lone Tree Creek beach.
- Figure 13.
Rocky habitat at the slide toe of
Lone Tree landslide in May, 1990, before the slide manipulation.
- Figure 14.
(a) View of Lone Tree South Slide
beach in July, 1991, immediately after the slide manipulation, and (b) in March, 1993.
Photographed from the fill face looking south.
- Figure 15.
(a) View of Lone Tree South Slide
beach in July, 1991, immediately after the slide manipulation, and (b) in May, 1995.
Photographed from the south end of the beach looking north.
- Figure 16.
(a) Armoring of the slide toe in
June, 1991, and (b) in May, 1995. Photographed from the intertidal rock looking north.
Note the increase in the width of the intertidal zone and the retreat of the fill toe.
- Figure 17.
Large sediment plumes off Duxbury
Reef and Lone Tree landslide in May, 1991.
- Figure 18.
(a) Extensive natural sediment
plumes along the Lone Tree coastline from Muir Beach, to the south, and beyond the slide
to the north. Lone Tree landslide is outlined in red. (b) Highly persistent natural
sediment plume around Duxbury Reef in November, 1991.
- Figure 19. (a) Lone Tree slide sediment plume in April, 1993, showing northward
transport nearshore and southward transport offshore. (b) Normal sediment plume
configuration off the Lone Tree landslide. Photograph taken in April, 1992.
- Figure 20. (a)Sea floor features and (b) bathymetry of Lone Tree slide vicinity in
June, 1994
- Figure 21. (a)Sea floor features and (b) bathymetry of Lone Tree slide vicinity in
October, 1994.
- Figure 22.
Rocky intertidal habitat at Slide
Ranch in October, 1990.
- Figure 23.
Close-up of the algal community in the
mid intertidal zone in October, 1990 at (a) South Slide and (b) Slide Ranch.
- Figure 24.
Burial of rocky intertidal
communities along the South Slide beach in (a) June, 1991, and (b) July, 1991, directly
after the slide manipulation.
- Figure 25.
Typical sediment scour of rocky
intertidal communities along South Slide beach.
- Figure 26.
Some of the rich encrusting marine
invertebrate communities on the sides of intertidal rocks in November, 1990, which were
buried on South Slide beach by the slide manipulation in 1991.
- Figure 27.
Colonization by green algae of intertidal rocks below the slide fill toe, August,
1992.
- Figure 28.
Mussel and gooseneck barnacle
communities on the tops of the intertidal rocks at the slide toe in June, 1991. These
communities periodically colonized isolated rocks below the slide toe and on South Slide
beach.
- Figure 29.
Intertidal habitats around the Lone
Tree slide in 1990, before the slide manipulation.
- Figure 30.
Algae composition and cover at
Slide Ranch
- Figure 31.
Algae composition and cover at
Pelican Point
- Figure 32.
Algae composition and cover at Slide
face
- Figure 33.
Algae composition and cover at
South Slide.
- Figure 34.
Subtidal rock wall communities
(a) at the bottom (0-50 cm) and (b) at 1.5 m above the bottom on the North Pinnacle
directly in front of the slide in August, 1993.
- Figure 35.
Subtidal rock wall communities
(a) at the bottom (0-50 cm) and (b) at 1.5 m above the bottom on the North Pinnacle
directly in front of the slide in October, 1994.
- Figure 36.
Rock wall communities on pinnacle
which are scoured by sediment from the McWay landslide in Big Sur, showing colonization
of exposed substrate by barnacles.