Publications
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Debris-flow hazards in the United States Debris-flow hazards in the United States
No abstract available.
Authors
Lynn Highland, Stephenson D. Ellen, Sarah B. Christian, William M. Brown
Land-based high-resolution seismic-reflection surveys of seven sites in Duval and St. Johns Counties, northeastern Florida Land-based high-resolution seismic-reflection surveys of seven sites in Duval and St. Johns Counties, northeastern Florida
No abstract available.
Authors
J. K. Odum, W. J. Stephenson, R. A. Williams, D. M. Worley, D. J. Toth, R. M. Spechler, Thomas L. Pratt
History of the International Conference and Field Trip on Landslides (ICFL) History of the International Conference and Field Trip on Landslides (ICFL)
No abstract available.
Authors
E. E. Brabb
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Landslide Hazards Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Geographic relations of landslide distribution and assessment of landslide hazards in the Blanco, Cibuco, and Coamo basins, Puerto Rico Geographic relations of landslide distribution and assessment of landslide hazards in the Blanco, Cibuco, and Coamo basins, Puerto Rico
Landslide occurrence is common in mountainous areas of Puerto Rico where mean annual rainfall and the frequency of intense storms are high and hillslopes are steep. Each year, landslides cause extensive damage to property and occasionally result in loss of life. Landslide maps developed from 1:20,000 scale aerial photographs in combination with a computerized geographic information...
Authors
M. C. Larsen, A. J. Torres-Sanchez
Debris-flow hazards in the Blue Ridge of Virginia Debris-flow hazards in the Blue Ridge of Virginia
No abstract available.
Authors
Paula L. Gori, William C. Burton
New trends in active faulting studies for seismic hazard assessment New trends in active faulting studies for seismic hazard assessment
No abstract available.
Authors
Enzo Boschi, D. Giardini, D. Pantosti, Gianluca Valensise, Ramon Arrowsmith, Peter W. Basham, R. Burgmann, Anthony J. Crone, Alan Hull, Robin K. McGuire, David Schwartz, Kerry Sieh, Steven N Ward, Robert S. Yeats
Overview of landslide problems, research, and mitigation, Cincinnati, Ohio, area Overview of landslide problems, research, and mitigation, Cincinnati, Ohio, area
Landslides cause much damage to property throughout the metropolitan area of Cincinnati, Ohio. Most landslides occur in unconsolidated deposits, including colluvium, till, glacial lake clays, and man-made fill derived from colluvium and glacial deposits. Landslides in thin colluvium are widespread on steeper slopes that wall the valleys of the Ohio River and its tributaries. Abundant...
Authors
Rex L. Baum, Arvid M. Johnson
Submarine landslides Submarine landslides
Landslides are common on inclined areas of the seafloor, particularly in environments where weak geologic materials such as rapidly deposited, finegrained sediment or fractured rock are subjected to strong environmental stresses such as earthquakes, large storm waves, and high internal pore pressures. Submarine landslides can involve huge amounts of material and can move great distances...
Authors
M. A. Hampton, H.J. Lee, J. Locat
Aeromagnetic survey over US to advance geomagnetic research Aeromagnetic survey over US to advance geomagnetic research
A proposed high-altitude survey of the United States offers an exciting and cost effective opportunity to collect magnetic-anomaly data. Lockheed Martin Missile and Space Company is considering funding a reimbursable ER-2 aircraft (Figure 1) mission to collect synthetic aperture radar (SAR) imagery at an altitude of about 21 km over the conterminous United States and Alaska. The...
Authors
T.G. Hildenbrand, R.J. Blakely, W. J. Hinze, Gordon R. Keller, R.A. Langel, M. Nabighian, W. Roest
Site-response maps for the Los Angeles region based on earthquake ground motions Site-response maps for the Los Angeles region based on earthquake ground motions
Ground-motion records from aftershocks of the 1994 Northridge earthquake and main-shock records from the 1971 San Fernando, 1987 Whittier Narrows, 1991 Sierra Madre, and 1994 Northridge earthquakes are used to estimate site response in the urban Los Angeles, California, area. Two frequency bands are considered, 0.5-1.5 Hz and 2.0-6.0 Hz. Instrument characteristics prevented going to...
Authors
Stephen H. Hartzell, Stephen C. Harmsen, Arthur D. Frankel, David L. Carver, Edward Cranswick, Mark E. Meremonte, John A. Michael
The Loma Prieta, California, Earthquake of October 17, 1989: Main shock characteristics The Loma Prieta, California, Earthquake of October 17, 1989: Main shock characteristics
The October 17, 1989, Loma Prieta, Calif., earthquake (0004:15.2 G.m.t. October 18; lat 37.036º N., long 121.883º W.; 19-km depth) had a local magnitude (ML) of about 6.7, a surface-wave magnitude (MS) of 7.1, a seismic moment of 2.2x1019 N-m to 3.5x1019 N-m, a source duration of 6 to 15 s, and an average stress drop of at least 50 bars. Slip occurred on a dipping fault surface about 35...
Authors
Paul A. Spudich, Gregory C. Beroza, George Choy, John Boatwright, Stephen H. Hartzell, Gordon L. Stewart, Carlos Mendoza, Stephen Horton, John G. Anderson, Andres J. Mendez, Hiroo Kanamori, Kenji Satake, Michael Lisowski, Mark Hunter Murray, Jerry L. Svarc, Grant Marshall, Ross S. Stein, Karen McNally, Gerald W. Simila, Judy G. Brown, J.L. Nabelek, Ze’ev Reches, Mark D. Zoback, Jamison Steidl, Ralph J. Archuleta, Aaron A. Velasco, Thorne Lay, Jiajun Zhang, David J. Wald, Donald V. Helmberger, Thomas H. Heaton, Chesley R. Williams, Paul Segall, Francis T. Wu, Mingdong Wu, J.W. Rudnicki
Geomagnetic storms, the Dst ring-current myth and lognormal distributions Geomagnetic storms, the Dst ring-current myth and lognormal distributions
The definition of geomagnetic storms dates back to the turn of the century when researchers recognized the unique shape of the H-component field change upon averaging storms recorded at low latitude observatories. A generally accepted modeling of the storm field sources as a magnetospheric ring current was settled about 30 years ago at the start of space exploration and the discovery of...
Authors
W.H. Campbell