Publications
Filter Total Items: 3065
Objective delineation of lahar-inundation hazard zones Objective delineation of lahar-inundation hazard zones
A new method of delineating lahar hazard zones in valleys that head on volcano flanks provides a rapid, objective, reproducible alternative to traditional methods. The rationale for the method derives from scaling analyses of generic lahar paths and statistical analyses of 27 lahar paths documented at nine volcanoes. Together these analyses yield semiempirical equations that predict...
Authors
Richard M. Iverson, Steven P. Schilling
An empirical method for estimating travel times for wet volcanic mass flows An empirical method for estimating travel times for wet volcanic mass flows
Travel times for wet volcanic mass flows (debris avalanches and lahars) can be forecast as a function of distance from source when the approximate flow rate (peak discharge near the source) can be estimated beforehand. The near-source flow rate is primarily a function of initial flow volume, which should be possible to estimate to an order of magnitude on the basis of geologic...
Authors
Thomas C. Pierson
Sediment transport at gaging stations near Mount St. Helens, Washington, 1980-90. Data collection and analysis Sediment transport at gaging stations near Mount St. Helens, Washington, 1980-90. Data collection and analysis
River sedimentation caused by the May 18, 1980, eruption of Mount St. Helens, Washington, has been monitored in a continuing program by the U.S. Geological Survey. In this report, sediment discharge and changes in sediment transport are summarized from data collected at stream-gaging stations near Mount St. Helens during the years 1980 through 1990. The objectives of the monitoring...
Authors
Randal L. Dinehart
Detecting debris flows using ground vibrations Detecting debris flows using ground vibrations
Debris flows are rapidly flowing mixtures of rock debris, mud, and water that originate on steep slopes. During and following volcanic eruptions, debris flows are among the most destructive and persistent hazards. Debris flows threaten lives and property not only on volcanoes but far downstream in valleys that drain volcanoes where they arrive suddenly and inundate entire valley bottoms...
Authors
Richard G. LaHusen
Sulfur dioxide emission rates of Kilauea Volcano, Hawaii, 1979-1997 Sulfur dioxide emission rates of Kilauea Volcano, Hawaii, 1979-1997
Sulfur dioxide (SO2) emission rates from Kilauea Volcano were first measured by Stoiber and Malone (1975) and have been measured on a regular basis since 1979 (Casadevall and others, 1987; Greenland and others, 1985; Elias and others, 1993; Elias and Sutton, 1996). The purpose of this report is to present a compilation of Kilauea SO2 emission rate data from 1979 through 1997 with...
Authors
Tamar Elias, A. J. Sutton, J. B. Stokes, T. J. Casadevall
Mount Rainier: Living with perilous beauty Mount Rainier: Living with perilous beauty
Mount Rainier is an active volcano reaching more than 2.7 miles (14,410 feet) above sea level. Its majestic edifice looms over expanding suburbs in the valleys that lead to nearby Puget Sound. USGS research over the last several decades indicates that Mount Rainier has been the source of many volcanic mudflows (lahars) that buried areas now densely populated. Now the USGS is working...
Authors
Kevin M. Scott, Edward W. Wolfe, Carolyn L. Driedger
The age and constitution of Cerro Campanario, a mafic stratovolcano in the Andes of central Chile The age and constitution of Cerro Campanario, a mafic stratovolcano in the Andes of central Chile
Cerro Campanario, a towering landmark on the continental divide near Paso Pehuenche, is a glacially eroded remnant of a mafic stratovolcano that is much younger than previously supposed. Consisting of fairly uniform basaltic andesite, rich in olivine and plagioclase, the 10-15 km3 edifice grew rapidly near the end of the middle Pleistocene, about 150-160 ka, as indicated by 40Ar/39Ar and...
Authors
Wes Hildreth, B. Singer, E. Godoy, F. Munizaga
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