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08CO, p.
1995 La Conchita landslide in California
Fig. 8-1a, p.
The community of La Conchita, California-- soft marine terrace above it gave way when soaked with too much water
Fig. 8-1b, p.
irrigated avocado field is visible at the top of the terrace in this photograph, which was taken the day after the landslide in 1995
Fig. 8-2, p.
talus slope of basalt blocks formed as rocks fell from the cliff and rolled down the slope to rest at their angle of repose (Columbia River Plateau near Palouse Falls, WA).
Fig. 8-3, p.
the main features of a rotational landslide
Fig. 8-4, p.
forces on a mass resting on a slope
steeper slope has a larger force parallel to the slope (red arrow)
for the gentler slope, the friction force (f) is larger than the force pulling parallel to the slope (F),
Fig. 8-5, p.
Capillary cohesion in the narrow necks between grains pulls the grains together. Fig. 8-6, p.
Water pressure at depth is equal to the load or weight of the overlying water.
Fig. 8-7, p.
Water (dark) seeps out of the soil below the sharply defined saturation level exposed in a road cut in Glacier National Park, Montana Fig. 8-8, p.
1999 Dana Point landslide north of San Diego, California
Fig. 8-9, p.
Filling a reservoir behind a dam raises groundwater in the adjacent slopes, often leading to sliding into the reservoir (^) Fig. 8-10, p.
Installation of a perforated drainpipe can lower the water table and reduce the chance of sliding.
Rissa Landslide, 1978 near Rissa Norway
http://geotechnical.ce.w ashington.edu/courses/ cee522/RissaLandslide/ rissa.html
Fig. 8-17a, p.
The Northridge earthquake caused a swarm of landslides
Fig. 8-17b, p.
Magn. 7.9 earthquake on the Denali Fault 2003 caused landslide onto Black Rapids Glacier, Alaska Range Fig. 8-18, p.
Mitigation: installing heavy wire mesh over a dangerous rockfall area above the Trans Canada Highway.
Fig. 8-19a, p.
Workers drill and bolt a rock cliff above Highway 1 at mouth of Topanga Canyon, CA, west of Los Angeles Fig. 8-19b, p.
Rockbolts and shotcrete stabilize a heavily fractured road cut below houses in Acapulco, Mexico
Fig. 8-20, p.
Subsidence and seaward spreading of the marine terrace in Anchorage
This dropped trough formed at the head of the L Street landslide Fig. 8-21, p.
Steeply dipping limestone beds slope toward and daylight over a coastal highway near Sorento, Italy
Fig. 8-22, p.
hummocky landslide terrain is near Gardena, north of Boise, Idaho
Subtle evidence!
Table 8-1, p.
Fig. 8-23, p.
Marble Canyon, Arizona, recent rockfall debris forms talus fallen from the visible scar on the cliff above.
Fig. 8-24, p.
North Cascades HWY November 10, 2003
Fig. 8-29, p.
Frank slide peeled off the whole east face of Turtle Mountain and spread a bouldery limestone deposit across the valley and up the slope to the west. Fig. 8-30, p.
slope before and after the Frank slide
Fig. 8-31, p.
cross section shows the Elm, Switzerland, debris avalanche and the location of the slate quarry that set it off. Fig. 8-32, p.
Mount Nevados Huascarán debris avalanche in 1970 buried the town of Yungay
Fig. 8-33, p.
Mclure slide south of Aspen, Colorado, is notorious for continuing to slide. The car plunged off the severed road in 1994 Fig. 8-34, p.
Blackfoot landslide in Montana
Rotation of a slump block
Fig. 8-35, p.207 Fig. 8-36, p.
A house begins to break up in a series of rotational slumps in Colorado River bluffs, Grand Junction, Colorado
Fig. 8-37, p.
Crushed rock is scattered along the failure surface of a landslide at Newport, Oregon (see arrow). Fig. 8-38, p.
Heavy boulders are often piled on the lower part of a slide to resist movement. This road, cut through a landslide on U.S. Highway 101 near Garberville, in northern California
Fig. 8-39, p.
A section of coastal cliff at the edge of Puget Sound, near Seattle, collapsed, crushing and burying a home on the narrow strip of beach Fig. 8-40, p.
sackung features
in the high mountains of British Columbia
Fig. 8-47, p.
stronger layer over weak clays may fail by lateral spreading. Parts of the spreading mass may drop as it spreads. Fig. 8-48, p.
Palm Springs
Fig. 8-49, p.
debris flows from the huge fault scarp of the Wasatch Front behind Salt Lake City, Utah, in 1983 (^) Fig. 8-50, p.
1996 debris-flow channel, a tributary to the Columbia River, near Dodson
Fig. 8-51, p.
Slide Mountain, Nevada, southwest of Reno in May of (^1983) Fig. 8-52, p.
debris flow in the Andes of northwestern Argentina
Fig. 8-53, p.
This diagram shows the distribution of grain sizes and water in a debris flow. Fig. 8-54, p.
May 1998, a muddy debris flow from the steep hillside to the right of this house in Siano, Italy, east of Mount Vesuvius
House buried by debris flow (^) Fig. 8-55, p.215 Fig. 8-56, p.
The small community of Orting, Washington, is built on huge mudflows that poured down a valley from Mount Rainier 500 years ago. Earlier mudflows filled the same valley; undoubtedly, mudflows will do so again
Fig. 8-57a, p.
May 1998, a muddy debris flow from the steep hillside to the right of this house in Siano, Italy, east of Mount Vesuvius (^) Fig. 8-57b, p.
The end of this apartment building on the Caraballeda fan collapsed when debris-fl ow boulders crushed key support columns. The largest boulder is more than 2 meters high.
Fig. 8-64, p.
fast-moving mudflows racing right to left down the valley from Mount Pinatubo in the Philippines Fig. 8-65, p.
A large earthquake on January 13, 2001, triggered this devastating mudslide in a middle-class subdivision in Colonia Las Colinas, El Salvador. It killed ~585.
Fig. 8-66, p.
Soil creep produces a slow downslope movement of the upper layers of soil or soft rocks.
Fig. 8-67, p.
Pistol-butt trees are often a signal of soil creep
Fig. 8-68, p.221 Table 8-2, p.
Table 8-3, p.223 Fig. 8-69, p.
distribution of landslide-prone areas in the United States.
Fig. 8-70, p.
hummocks deposited as a massive landslide from Mount Shasta, visible in the upper left. This slide occurred between 300,000 and 380,000 yr ago and was 25 km 3
