Publications
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Potential for seepage erosion of landslide dam Potential for seepage erosion of landslide dam
The failure potential of the debris-avalanche dam at Castle Lake near Mount St. Helens, Washington, by three processes of seepage erosion (1) Heave; (2) piping; and (3) internal erosion, is examined. Results indicated that the dam is stable against piping but potentially locally unstable against heave. -from Authors
Authors
W. Meyer, R. L. Schuster, M. A. Sabol
Seismic structure of the uppermost mantle beneath the Kenya rift Seismic structure of the uppermost mantle beneath the Kenya rift
A major goal of the Kenya Rift International Seismic Project (KRISP) 1990 experiment was the determination of deep lithospheric structure. In the refraction/wide-angle reflection part of the KRISP effort, the experiment was designed to obtain arrivals to distances in excess of 400 km. Phases from interfaces within the mantle were recorded from many shotpoints, and by design, the best...
Authors
Gordon R. Keller, J. Mechie, L.W. Braile, Walter D. Mooney, C. Prodehl
Landslides triggered by the Northridge earthquake Landslides triggered by the Northridge earthquake
No abstract available.
Authors
R.W. Jibson, E. L. Harp, D. K. Keefer, R. C. Wilson
Deep structure beneath Lake Ontario: Crustal-scale Grenville subdivisions Deep structure beneath Lake Ontario: Crustal-scale Grenville subdivisions
Lake Ontario marine seismic data reveal major Grenville crustal subdivisions beneath central and southern Lake Ontario separated by interpreted shear zones that extend to the lower crust. A shear zone bounded transition between the Elzevir and Frontenac terranes exposed north of Lake Ontario is linked to a seismically defined shear zone beneath central Lake Ontario by prominent...
Authors
D. A. Forsyth, Bernd Milkereit, Colin A. Zelt, D. J. White, R. M. Easton, Deborah R. Hutchinson
Historical shoreline mapping (II): Application of the Digital Shoreline Mapping and Analysis Systems (DSMS/DSAS) to shoreline change mapping in Puerto Rico Historical shoreline mapping (II): Application of the Digital Shoreline Mapping and Analysis Systems (DSMS/DSAS) to shoreline change mapping in Puerto Rico
A new, state-of-the-art method for mapping historical shorelines from maps and aerial photographs, the Digital Shoreline Mapping System (DSMS), has been developed. The DSMS is a freely available, public domain software package that meets the cartographic and photogrammetric requirements of precise coastal mapping, and provides a means to quantify and analyze different sources of error in...
Authors
E. Robert Thieler, William W. Danforth
Lake-level history of Lake Michigan for the past 12,000 years: the record from deep lacustrine sediments Lake-level history of Lake Michigan for the past 12,000 years: the record from deep lacustrine sediments
Collection and analysis of an extensive set of seismic-reflection profiles and cores from southern Lake Michigan have provided new data that document the history of the lake basin for the past 12,000 years. Analyses of the seismic data, together with radiocarbon dating, magnetic, sedimentologic, isotopic, and paleontologic studies of core samples, have allowed us to reconstruct lake...
Authors
Steven M. Colman, Richard M. Forester, Richard L. Reynolds, Donald S. Sweetkind, John W. King, Paul Gangemi, Glenn A. Jones, Loyd D. Keigwin, David S. Foster
Lake Michigan's late Quaternary limnological and climate history from ostracode, oxygen isotope, and magnetic susceptibility Lake Michigan's late Quaternary limnological and climate history from ostracode, oxygen isotope, and magnetic susceptibility
The limnology of Lake Michigan has changed dramatically since the late Pleistocene in response to the expansion and contraction of continental glaciers, to differential isostatic rebound, and to climate change. The lake sediment's stratigraphic trends, magnetic susceptibility, δ18O, and ostracode species abundance ratios provide criteria to identify the lake's response to glacial ice and...
Authors
Richard M. Forester, Steven M. Colman, Richard L. Reynolds, Loyd D. Keigwin
Stability of submerged slopes on the flanks of the Hawaiian Islands, a simplified approach Stability of submerged slopes on the flanks of the Hawaiian Islands, a simplified approach
Undersea transmission lines and shoreline AC-DC conversion stations and near-shore transmission lines are being considered as part of a system for transporting energy between the Hawaiian Islands. These facilities will need to be designed so that they will not be damaged or destroyed by coastal or undersea landslides. Advanced site surveys and engineering design of these facilities will...
Authors
Homa J. Lee, Michael Torresan, William McArthur
Video of the August 18, 1992, eruption of Crater Peak vent on Spurr Volcano, Alaska Video of the August 18, 1992, eruption of Crater Peak vent on Spurr Volcano, Alaska
No abstract available.
Authors
Robert G. McGimsey, Joseph M. Dorava
Hydrologic hazards at Alaska volcanoes?Chakachatna River Basin near Crater Peak, Spurr Volcano Hydrologic hazards at Alaska volcanoes?Chakachatna River Basin near Crater Peak, Spurr Volcano
No abstract available.
Authors
J.M. Dorava, C. F. Waythomas
Overview of the southern Lake Michigan coastal erosion study Overview of the southern Lake Michigan coastal erosion study
No abstract available.
Authors
David W. Folger, Steven M. Colman, Peter W. Barnes
Channelized subglacial drainage over a deformable bed Channelized subglacial drainage over a deformable bed
We develop theoretically a description of a possible subglacial drainage mechanism for glaciers and ice sheets moving over saturated, deformable till. The model is based on the plausible assumption that flow of water in a thin film at the ice-till interface is unstable to the formation of a channelized drainage system, and is restricted to the case in which meltwater cannot escape...
Authors
J. S. Walder, A. Fowler