Publications
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The frequency and distribution of recent landslides in three montane tropical regions of Puerto Rico The frequency and distribution of recent landslides in three montane tropical regions of Puerto Rico
Landslides are common in sttep mountainous areas of Puerto Rico where mean annual rainfall and the frequency of intense storms are high. Each year, landslides cause extensive damage to property and coccasionally result in loss of life. Average population density is high, 422 people/km2, and is increasing. This increase in population density is accompanied by growing stress on the natural
Authors
M. C. Larsen, A. J. Torres-Sanchez
Automated detection of Pi 2 pulsations using wavelet analysis: 1. Method and an application for substorm monitoring Automated detection of Pi 2 pulsations using wavelet analysis: 1. Method and an application for substorm monitoring
Wavelet analysis is suitable for investigating waves, such as Pi 2 pulsations, which are limited in both time and frequency. We have developed an algorithm to detect Pi 2 pulsations by wavelet analysis. We tested the algorithm and found that the results of Pi 2 detection are consistent with those obtained by visual inspection. The algorithm is applied in a project which aims at the...
Authors
M. Nose, T. Iyemori, M. Takeda, T. Kamei, D. K. Milling, D. Orr, H. J. Singer, E. W. Worthington, N. Sumitomo
Scaling laws from geomagnetic time series Scaling laws from geomagnetic time series
The notion of extended self-similarity (ESS) is applied here for the X-component time series of geomagnetic field fluctuations. Plotting nth order structure functions against the fourth order structure function we show that low-frequency geomagnetic fluctuations up to the order n = 10 follow the same scaling laws as MHD fluctuations in solar wind, however, for higher frequencies (f > 1/5...
Authors
Z. Voros, P. Kovacs, A. Juhasz, A. Kormendi, A.W. Green
Map showing landslide susceptibility in the Comerio Municipality, Puerto Rico Map showing landslide susceptibility in the Comerio Municipality, Puerto Rico
No abstract available.
Authors
M. C. Larsen, J.E. Parks
Surface deformation as a guide to kinematics and three-dimensional shape of slow-moving, clay-rich landslides, Honolulu, Hawaii Surface deformation as a guide to kinematics and three-dimensional shape of slow-moving, clay-rich landslides, Honolulu, Hawaii
Two slow-moving landslides in Honolulu, Hawaii, were the subject of photogrammetric measurements, field mapping, and subsurface investigation to learn whether surface observations can yield useful information consistent with results of subsurface investigation. Mapping focused on structural damage and on surface features such as scarps, shears, and toes. The x-y-z positions of photo...
Authors
R.L. Baum, J. Messerich, R. W. Fleming
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
Geologic hazards and relative slope stability of the inactive part of the Slumgullion Landslide, southwestern Colorado Geologic hazards and relative slope stability of the inactive part of the Slumgullion Landslide, southwestern Colorado
No abstract available.
Authors
Mario Parise, Andrea Moscariello
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