Publications
Filter Total Items: 3019
Geology of Akutan Island, Alaska Geology of Akutan Island, Alaska
No abstract available.
Authors
Donald H. Richter, Christopher F. Waythomas, Robert G. McGimsey, Peter L. Stelling
Experimental analysis of debris-flow deposition--process and effects of pore-fluid pressure Experimental analysis of debris-flow deposition--process and effects of pore-fluid pressure
No abstract available.
Authors
Jon J. Major, Richard M. Iverson
Response of flexible wire rope barriers to debris-flow loading Response of flexible wire rope barriers to debris-flow loading
No abstract available.
Authors
Jay S. DeNatale, Gregg L. Fiegel, Richard M. Iverson, Jon J. Major, Richard G. Lahusen, John D. Duffy, Gregory D. Fisher
The Loma Prieta, California, earthquake of October 17, 1989: Aftershocks and postseismic effects The Loma Prieta, California, earthquake of October 17, 1989: Aftershocks and postseismic effects
While the damaging effects of the earthquake represent a significant social setback and economic loss, the geophysical effects have produced a wealth of data that have provided important insights into the structure and mechanics of the San Andreas Fault system. Generally, the period after a large earthquake is vitally important to monitor. During this part of the seismic cycle, the...
Authors
Paul A. Reasenberg, Lynn D. Dietz, William L. Ellsworth, Robert W. Simpson, John W. Gephart, Susan Y. Schwartz, Glenn D. Nelson, H. Guo, A. Lerner-Lam, William Menke, Susan E. Hough, Leif Wennerberg, K.S. Breckenridge, Jeff Behr, Roger G. Bilham, Paul Bodin, Arthur G. Sylvester, Jon S. Galehouse, R. Burgmann, Paul Segall, Michael Lisowski, Jerry L. Svarc, John Langbein, Mark F. Linker, J.R. Rice, M. T. Gladwin, R. L. Gwyther, R.H.G. Hart, Randall Mackie, Theodore R. Madden, Edward A. Nichols
Discussion and closure: Slope instability from ground-water seepage Discussion and closure: Slope instability from ground-water seepage
No abstract available.
Authors
Richard M. Iverson, Muniram Budhu, Roger Gobin
What are volcano hazards? What are volcano hazards?
Volcanoes give rise to numerous geologic and hydrologic hazards. U.S. Geological Survey (USGS) scientists are assessing hazards at many of the almost 70 active and potentially active volcanoes in the United States. They are closely monitoring activity at the most dangerous of these volcanoes and are prepared to issue warnings of impending eruptions or other hazardous events.
Authors
Bobbie Myers, Steven R. Brantley, Peter R. Stauffer, James W. Hendley
Volcano hazards in the Mount Hood region, Oregon Volcano hazards in the Mount Hood region, Oregon
Mount Hood is a potentially active volcano close to rapidly growing communities and recreation areas. The most likely widespread and hazardous consequence of a future eruption will be for lahars (rapidly moving mudflows) to sweep down the entire length of the Sandy (including the Zigzag) and White River valleys. Lahars can be generated by hot volcanic flows that melt snow and ice or by...
Authors
W. E. Scott, T.C. Pierson, S. P. Schilling, J. E. Costa, C. A. Gardner, J.W. Vallance, J. J. Major
Living on active volcanoes - The Island of Hawai'i Living on active volcanoes - The Island of Hawai'i
People on the Island of Hawai'i face many hazards that come with living on or near active volcanoes. These include lava flows, explosive eruptions, volcanic smog, damaging earthquakes, and tsunamis (giant seawaves). As the population of the island grows, the task of reducing the risk from volcano hazards becomes increasingly difficult. To help protect lives and property, U.S. Geological...
Authors
Christina Heliker, Peter H. Stauffer, James W. Hendley
Living on active volcanoes: The Island of Hawai'i Living on active volcanoes: The Island of Hawai'i
No abstract available.
Authors
Christina Heliker, Peter H. Stauffer, James W. Hendley
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
Living with volcanic risk in the Cascades Living with volcanic risk in the Cascades
The Cascade Range of the Pacific Northwest has more than a dozen potentially active volcanoes. Cascade volcanoes tend to erupt explosively, and on average two eruptions occur per century—the most recent were at Mount St. Helens, Washington (1980–86 and 2004–8), and Lassen Peak, California (1914–17). To help protect the Pacific Northwest’s rapidly expanding population, USGS scientists at...
Authors
Daniel Dzurisin, Peter H. Stauffer, James W. Hendley
Primitive magmas at five Cascade volcanic fields: Melts from hot, heterogeneous sub-arc mantle Primitive magmas at five Cascade volcanic fields: Melts from hot, heterogeneous sub-arc mantle
Major and trace element concentrations, including REE by isotope dilution, and Sr, Nd, Pb, and O isotope ratios have been determined for 38 mafic lavas from the Mount Adams, Crater Lake, Mount Shasta, Medicine Lake, and Lassen volcanic fields, in the Cascade arc, northwestern part of the United States. Many of the samples have a high Mg# [100Mg/(Mg + FeT) > 60] and Ni content (>140 ppm)...
Authors
C. R. Bacon, P. E. Bruggman, R.L. Christiansen, M.A. Clynne, J.M. Donnelly-Nolan, W. Hildreth