Publications
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Late Quaternary normal faulting of the Hat Creek basalt, northern California Late Quaternary normal faulting of the Hat Creek basalt, northern California
The Hat Creek fault is a major, young, north-striking, normal fault along the western boundary of extensional Basin and Range deformation in the Lessen region of northeastern California. Volcanic rocks of Quaternary and late Pliocene age are displaced a total of >500 m down to the west along west-facing, en echelon scarps now retreated to ∼35° slopes. Fresh, young scarps as much as 30 m...
Authors
L.I.P. Muffler, M.A. Clynne, D.E. Champion
Measurements of thermal-water discharge outside Lassen Volcanic National Park, California, 1983-94 Measurements of thermal-water discharge outside Lassen Volcanic National Park, California, 1983-94
No abstract available.
Authors
Michael L. Sorey, Elizabeth M. Colvard, S. E. Ingebritsen
Volcanic activity and ground deformation hazard analysis for the Hawaii Geothermal Project environmental impact statement Volcanic activity and ground deformation hazard analysis for the Hawaii Geothermal Project environmental impact statement
No abstract available
Authors
James P. Kauahikaua, Richard B. Moore, Paul T. Delaney
Chemistry of spring and well waters on Kilauea Volcano, Hawaii, and vicinity Chemistry of spring and well waters on Kilauea Volcano, Hawaii, and vicinity
Published and new data for chemical and isotopic samples from wells and springs on Kilauea Volcano and vicinity are presented. These data are used to understand processes that determine the chemistry of dilute meteoric water, mixtures with sea water, and thermal water. Data for well and spring samples of non-thermal water indicate that mixing with sea water and dissolution of rock from...
Authors
Cathy J. Janik, Manuel Nathenson, M. A. Scholl
The Loma Prieta, California, earthquake of October 17, 1989: Tectonic processes and models The Loma Prieta, California, earthquake of October 17, 1989: Tectonic processes and models
If there is a single theme that unifies the diverse papers in this chapter, it is the attempt to understand the role of the Loma Prieta earthquake in the context of the earthquake 'machine' in northern California: as the latest event in a long history of shocks in the San Francisco Bay region, as an incremental contributor to the regional deformation pattern, and as a possible harbinger...
Authors
Robert W. Simpson, John H. Shaw, Richard E. Bischke, J. Suppe, Gianluca Valensise, Susan Y. Schwartz, Daniel L. Orange, Robert S. Anderson, Paul A. Reasenberg, Paul Bodin, Roger G. Bilham, Kevin P. Furlong, David Verdonck
A field-trip guide to Yellowstone National Park, Wyoming, Montana, and Idaho: Volcanic, hydrothermal, and glacial activity in the region A field-trip guide to Yellowstone National Park, Wyoming, Montana, and Idaho: Volcanic, hydrothermal, and glacial activity in the region
This field-trip guide was originally prepared for the 7th International Symposium on Water/Rock Interaction (WRI-7) held in July 1992 in Park City, Utah. A large and diversified group of earth scientists and accompanying family members participated in this 3 1/2-day field trip that focused on water/rock interactions over widely ranging temperatures and pressures in the Yellowstone/Grand...
Authors
Robert O. Fournier, R.L. Christiansen, R. A. Hutchinson, K. L. Pierce
The KRISP 90 seismic experiment-a technical review The KRISP 90 seismic experiment-a technical review
On the basis of a preliminary experiment in 1985 (KRISP 85), a seismic refraction/wide-angle reflection survey and a teleseismic tomography experiment were jointly undertaken to study the lithospheric structure of the Kenya rift down to depths of greater than 200 km. This report serves as an introduction to a series of subsequent papers and will focus on the technical description of the...
Authors
C. Prodehl, J. Mechie, U. Achauer, Gordon R. Keller, M.A. Khan, Walter D. Mooney, S.J. Gaciri, J.D. Obel
Vertical structure of mean cross-shore currents across a barred surf zone Vertical structure of mean cross-shore currents across a barred surf zone
Mean cross-shore currents observed across a barred surf zone are compared to model predictions. The model is based on a simplified momentum balance with a turbulent boundary layer at the bed. Turbulent exchange is parameterized by an eddy viscosity formulation, with the eddy viscosity Aυ independent of time and the vertical coordinate. Mean currents result from gradients due to wave...
Authors
John W. Haines, Asbury H. Sallenger
Analysis of the origin of landslides in the New Madrid seismic zone Analysis of the origin of landslides in the New Madrid seismic zone
No abstract available.
Authors
R.W. Jibson, D. K. Keefer
Correlation of gold in siliceous sinters with 3He 4He in hot spring waters of Yellowstone National Park Correlation of gold in siliceous sinters with 3He 4He in hot spring waters of Yellowstone National Park
Opaline sinter samples collected at Yellowstone National Park (YNP) were analyzed for gold by neutron activation and for other trace elements by the inductively coupled plasma optical emission spectroscopy (ICP-OES) method. No correlation was found between Au and As, Sb, or total Fe in the sinters, although the sample containing the highest Au also contains the highest Sb. There also was...
Authors
R.O. Fournier, B. M. Kennedy, M. Aoki, J. M. Thompson
An updated numerical simulation of the ground-water flow system for the Castle Lake debris dam, Mount St. Helens, Washington, and implications for dam stability against heave An updated numerical simulation of the ground-water flow system for the Castle Lake debris dam, Mount St. Helens, Washington, and implications for dam stability against heave
A numerical simulation of the ground-water flow system in the Castle Lake debris dam, calibrated to data from the 1991 and 1992 water years, was used to estimate factors of safety against heave and internal erosion. The Castle Lake debris dam, 5 miles northwest of the summit of Mount St. Helens, impounds 19,000 acre-ft of water that could pose a flood hazard in the event of a lake...
Authors
Evelyn A. Roeloffs
Probability of one or more M ≥7 earthquakes in southern California in 30 years Probability of one or more M ≥7 earthquakes in southern California in 30 years
Eight earthquakes of magnitude greater than or equal to seven have occurred in southern California in the past 200 years. If one assumes that such events are the product of a Poisson process, the probability of one or more earthquakes of magnitude seven or larger in southern California within any 30 year interval is 67% ± 23% (95% confidence interval). Because five of the eight M ≥ 7...
Authors
James C. Savage