Publications
Filter Total Items: 2435
Soil relative dating of moraine and outwash-terrace sequences in the northern part of the upper Arkansas Valley, central Colorado, U.S.A. Soil relative dating of moraine and outwash-terrace sequences in the northern part of the upper Arkansas Valley, central Colorado, U.S.A.
Profile development indices for soils developed in moraines and outwash near Twin Lakes and in outwash near Leadville support the correlation of moraines with subdued morphology and two high outwash terraces with the Bull Lake glaciation (ca. 130-160 ka) and the correlation of hummocky moraines and two low outwash terraces with the Pinedale glaciation (ca. 14-47 ka). Elsewhere in the...
Authors
Alan R. Nelson, Ralph R. Shroba
Digital Compilation of "Preliminary Map of Landslide Deposits in Santa Cruz County, California, By Cooper-Clark and Associates, 1975": A Digital Map Database Digital Compilation of "Preliminary Map of Landslide Deposits in Santa Cruz County, California, By Cooper-Clark and Associates, 1975": A Digital Map Database
A 1:62,500-scale black-and-white map identifying some 2,000 landslides of various types in Santa Cruz County, California, has been converted to a digital-map database that can be acquired from the U.S. Geological Survey over the Internet or on magnetic tape.
Authors
Sebastian Report by Roberts, Andrew D. Barron, Earl E. Preface by Brabb, Richard J. Pike
Debris-flow hazards in the San Francisco Bay region Debris-flow hazards in the San Francisco Bay region
No abstract available.
Authors
Water Resources Division U.S. Geological Survey
Preliminary evaluation of the landslide potential in Capulin Canyon following the Dome fire, Bandelier National Monument, New Mexico Preliminary evaluation of the landslide potential in Capulin Canyon following the Dome fire, Bandelier National Monument, New Mexico
No abstract available.
Authors
S.H. Cannon, W. L. Ellis
Temperature, snowmelt, and the onset of spring season landslides in the central Rocky Mountains Temperature, snowmelt, and the onset of spring season landslides in the central Rocky Mountains
Snow meltwater (snowmelt) that seeps into the subsurface is a major factor contributing to the development of landslides during the spring in mountainous areas of the Rocky Mountain region. An examination of historical temperature data in relation to spring season landslide occurrences reveals an association between the landslide events and intervals of rising temperatures that...
Authors
Alan F. Chleborad
The variability of PSV response spectra across a dense array deployed during the Northridge aftershock sequence The variability of PSV response spectra across a dense array deployed during the Northridge aftershock sequence
This study addresses the variability of pseudo-velocity response spectra across an array deployed on stiff soil in the San Fernando Valley during the Northridge (Mw 6.7) aftershock sequence. The separation between stations ranged from 0.5 to 5 km, and the aftershock magnitudes ranged from 2.3 to 4.0. We find that 95-percent of observed response spectra are within a factor of 1.9 to 2.6...
Authors
Edward H. Field, Susan E. Hough
Index to detailed maps of landslides in the San Francisco Bay region, California Index to detailed maps of landslides in the San Francisco Bay region, California
No abstract available.
Authors
Richard J. Pike
Hydraulic modeling of unsteady debris-flow surges with solid-fluid interactions Hydraulic modeling of unsteady debris-flow surges with solid-fluid interactions
Interactions of solid and fluid constituents produce the unique style of motion that typifies debris flows. To simulate this motion, a new hydraulic model represents debris flows as deforming masses of granular solids variably liquefied by viscous pore fluid. The momentum equation of the model describes how internal and boundary forces change as coarse-grained surge heads dominated by...
Authors
Richard M. Iverson
Geotechnical properties of debris-flow sediments and slurries Geotechnical properties of debris-flow sediments and slurries
Measurements of geotechnical properties of various poorly sorted debris-flow sediments and slurries (??? 32 mm diameter) emphasize their granular nature, and reveal that properties of slurries can differ significantly from those of compacted sediments. Measurements show that: (1) cohesion probably offers little resistance to shear in most debris flows under low confining stresses...
Authors
J. J. Major, R.M. Iverson, D.F. McTigue, S. Macias, B.K. Fiedorowicz
Debris-flow hazards in areas affected by the June 27, 1995, storm in Madison County, Virginia Debris-flow hazards in areas affected by the June 27, 1995, storm in Madison County, Virginia
A severe storm on June 27, 1995 triggered hundreds of rock, debris and soil slides from the steep hillsides of Madison County, Virginia. Most of these transformed into debris flows that inundated areas downslope causing damage to structures, roads, utilities, livestock and crops. This report contains an analysis of areas susceptible to debris flows including an examination of source...
Authors
B. A. Morgan, G. F. Wieczorek, R. H. Campbell, P. L. Gori
Map showing principal debris-flow source areas in the San Francisco Bay region, California Map showing principal debris-flow source areas in the San Francisco Bay region, California
No abstract available.
Authors
Stephen D. Ellen, Robert K. Mark, Gerald F. Wieczorek, Carl M. Wentworth, David W. Ramsey, Thomas E. May