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Debris-flow initiation experiments using diverse hydrologic triggers Debris-flow initiation experiments using diverse hydrologic triggers

Controlled debris-flow initiation experiments focused on three hydrologic conditions that can trigger slope failure: localized ground-water inflow; prolonged moderate-intensity rainfall; and high-intensity rainfall. Detailed monitoring of slope hydrology and deformation provided exceptionally complete data on conditions preceding and accompanying slope failure and debris-flow...
Authors
Mark E. Reid, Richard G. LaHusen, Richard M. Iverson

Crustal structure along the west flank of the Cascades, western Washington Crustal structure along the west flank of the Cascades, western Washington

Knowledge of the crustal structure of the Washington Cascades and adjacent Puget Lowland is important to both earthquake hazards studies and geologic studies of the evolution of this tectonically active region. We present a model for crustal velocity structure derived from analysis of seismic refraction/wide-angle reflection data collected in 1991 in western Washington. The 280-km-long...
Authors
K.C. Miller, Gordon R. Keller, J.M. Gridley, James H. Luetgert, Walter D. Mooney, H. Thybo

Digital compilation of landslide overview map of the conterminous United States Digital compilation of landslide overview map of the conterminous United States

This dataset consists of polygons enclosing areas of landslide incidence and susceptibility for the conterminous United States.
Authors
Jonathan W. Godt, Dorothy H. Radbruch-Hall

Volcanic ash - danger to aircraft in the north Pacific Volcanic ash - danger to aircraft in the north Pacific

The world's busy air traffic corridors pass over hundreds of volcanoes capable of sudden, explosive eruptions. In the United States alone, aircraft carry many thousands of passengers and millions of dollars of cargo over volcanoes each day. Volcanic ash can be a serious hazard to aviation even thousands of miles from an eruption. Airborne ash can diminish visibility, damage flight...
Authors
Christina A. Neal, Thomas J. Casadevall, Thomas P. Miller, James W. Hendley, Peter H. Stauffer

Seafloor studies of Mamala Bay, Honolulu, Hawaii Seafloor studies of Mamala Bay, Honolulu, Hawaii

No comprehensive study of the effects of disposal of dredge spoils has been conducted to determine if the environment has suffered. The U.S. Army Corps of Engineers (USACE) has regularly dredged the shipping channels of Honolulu Harbor and Pearl Harbor for commercial and military purposes. The 5-year frequency for new dredging activity has led to the formation of extensive offshore wide...
Authors
Michael E. Torresan

No: The L.A. array is not ready for prime time No: The L.A. array is not ready for prime time

Although much interest will focus upon the temporal behavior of observed deformation, the principal justification for the SCIGN array is that within a 5‐year interval it will provide an accurate and detailed determination of the velocity field in the Los Angeles basin that can be used to identify the active faults and estimate their secular slip rates. Obviously, the accuracy of the...
Authors
James C. Savage
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