Publications
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Preventing volcanic catastrophe; the U.S. International Volcano Disaster Assistance Program Preventing volcanic catastrophe; the U.S. International Volcano Disaster Assistance Program
When the seismograph began to record the violent earth-shaking caused by yet another eruption of the Nevado del Ruiz volcano in Colombia, no one thought that a few hours later more than 23,000 people would be dead, killed by lahars (volcanic debris flows) in towns and villages several tens of kilometers away from the volcano. Before the fatal eruption the volcano was being monitored by...
Authors
J.W. Ewert, T.L. Murray, A. B. Lockhart, C.D. Miller
Submarine landslides: Selected studies in the U.S. Exclusive Economic Zone Submarine landslides: Selected studies in the U.S. Exclusive Economic Zone
No abstract available.
Authors
William C. Schwab, Homa J. Lee, David C. Twichell
Earthquake locations determined by the Southern Alaska seismograph network for October 1971 through May 1989 Earthquake locations determined by the Southern Alaska seismograph network for October 1971 through May 1989
This report describes the instrumentation and evolution of the U.S. Geological Survey’s regional seismograph network in southern Alaska, provides phase and hypocenter data for seismic events from October 1971 through May 1989, reviews the location methods used, and discusses the completeness of the catalog and the accuracy of the computed hypocenters. Included are arrival time data for...
Authors
Kent A. Fogleman, John C. Lahr, Christopher D. Stephens, Robert A. Page
The Loma Prieta, California, earthquake of October 17, 1989: Preseismic observations The Loma Prieta, California, earthquake of October 17, 1989: Preseismic observations
The October 17, 1989, Loma Prieta, Calif., Ms=7.1 earthquake provided the first opportunity in the history of fault monitoring in the United States to gather multidisciplinary preearthquake data in the near field of an M=7 earthquake. The data obtained include observations on seismicity, continuous strain, long-term ground displacement, magnetic field, and hydrology. The papers in this...
Authors
Malcolm J. S. Johnston, Jean A. Olson, David P. Hill, Anthony C. Fraser-Smith, Arman Bernardi, Robert A. Helliwell, Paul R. McGill, O.G. Villard, Robert J. Mueller, Randall A. White, William L. Ellsworth, Evelyn A. Roeloffs, Alan T. Linde, M. T. Gladwin, R. L. Gwyther, R.H.G. Hart, Michael Lisowski, James C. Savage, William H. Prescott, Jerry L. Svarc, Mark Hunter Murray, P.G. Silver, N. J. Valette-Silver, Olga Kolbek
The danger of collapsing lava domes; lessons for Mount Hood, Oregon The danger of collapsing lava domes; lessons for Mount Hood, Oregon
Nestled in the crater of Oregon's majestic Mount Hood volcano is Crater Rock, a prominent feature known to thousands of skiers, climbers, and tourists who journey each year to the famous Timberline Lodge located high on the volcano's south flank. Crater Rock stands about 100m above the sloping crater floor and warm fumaroles along its base emit sulfur gases and a faint steam plume that...
Authors
S.R. Brantley, W. E. Scott
Landslides caused by the Klamath Falls, Oregon, earthquakes of September 20, 1993 Landslides caused by the Klamath Falls, Oregon, earthquakes of September 20, 1993
The Klamath Falls earthquakes caused landslides throughout an area of about 420 sq km and as far as about 29 km from the epicenter, a distribution that is typical for magnitude 6 earthquakes (see graphs on following pages). Most of the landslides were rock falls or shallow, highly disrupted rock slides from roadcuts, quarries, and steep bluff faces. Such landslides are also among the...
Authors
D. K. Keefer, R. L. Schuster
A rainfall intensity-duration threshold for landslides in a humid- tropical environment, Puerto Rico A rainfall intensity-duration threshold for landslides in a humid- tropical environment, Puerto Rico
Landslides are triggered by factors such as heavy rainfall, seismic activity, and construction on hillslopes. The leading cause of landslides in Puerto Rico is intense and/or prolonged rainfall. A rainfall threshold for rainfall-triggered landsliding is delimited by 256 storms that occurred between 1959 and 1991 in the central mountains of Puerto Rico, where mean annual rainfall is close...
Authors
M. C. Larsen, A. Simon
Contaminant transport in Massachusetts Bay Contaminant transport in Massachusetts Bay
Construction of a new treatment plant and outfall to clean up Boston Harbor is currently one of the world's largest public works projects, costing about $4 billion. There is concern about the long-term impact of contaminants on Massachusetts Bay and adjacent Gulf of Maine because these areas are used extensively for transportation, recreation, fishing, and tourism, as well as waste...
Authors
Bradford Butman
Geology and the fishery of Georges Bank Geology and the fishery of Georges Bank
No abstract available.
Authors
Page C. Valentine
Seismic noise on Rarotonga: Surface versus downhole Seismic noise on Rarotonga: Surface versus downhole
Seismic noise data are presented from the new Global Seismographic Network station, RAR, on the Island of Rarotonga in the South Pacific. Data from the first new borehole site in the GSN are compared with a surface vault installation. Initial indications from the data show that borehole siting on a small island significantly reduces long-period (>20 s) horizontal seismic noise levels...
Authors
Rhett Butler, C. R. Hutt
Strain accumulation across the Wasatch Fault near Ogden, Utah Strain accumulation across the Wasatch Fault near Ogden, Utah
Deformation of a 70 by 40‐km trilateration network spanning the north trending Wasatch fault near Ogden, Utah, has been monitored from 1972 through 1990. All but nine of the 200 measurements are consistent with deformation that is linear in time. We presume that those nine observations are contaminated by some blunder in making the measurements and that deformation is linear in time. The...
Authors
James C. Savage, Michael Lisowski, W.H. Prescott
Interseismic deformation at the Nankai Trough, Japan, subduction zone Interseismic deformation at the Nankai Trough, Japan, subduction zone
Uplift along the coast of southwestern Japan following the 1944 Tonankai (Ms = 8.0) and 1946 Nankaido (Ms = 8.2) earthquakes has been inferred from the 1950–1985 tide gage records. Although uplift rates vary with geographic position, the temporal dependence at each site can be described as the superposition of an exponentially decaying (time constant ∼5 years) transient, significant only...
Authors
James C. Savage, Wayne R. Thatcher