Publications
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Landslide deposits in the Grouse Creek 30' X 60' Quadrangle, Utah, Nevada, and Idaho Landslide deposits in the Grouse Creek 30' X 60' Quadrangle, Utah, Nevada, and Idaho
No abstract available.
Authors
Roger B. Colton
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
The observational side of volcanology The observational side of volcanology
[No abstract available]
Authors
David A. Swanson, Hans-Ulrich Schmincke
Crustal structure beneath the Kenya Rift from axial profile data Crustal structure beneath the Kenya Rift from axial profile data
Modelling of the KRISP 90 axial line data shows that major crustal thinning occurs along the axis of the Kenya Rift from Moho depths of 35 km in the south beneath the Kenya Dome in the vicinity of Lake Naivasha to 20 km in the north beneath Lake Turkana. Low Pn velocities of 7.5–7.7 km/s are found beneath the whole of the axial line. The results indicate that crustal extension increases...
Authors
J. Mechie, Gordon R. Keller, C. Prodehl, S. Gaciri, L.W. Braile, Walter D. Mooney, D. Gajewski, K.-J. Sandmeier
Galileo Photometry of Asteroid 951 Gaspra Galileo Photometry of Asteroid 951 Gaspra
Galileo images of Gaspra make it possible for the first time to determine a main-belt asteroid's photometric properties accurately by providing surface-resolved coverage over a wide range of incidence and emission angles and by extending the phase angle coverage to phases not observable from Earth. We combine Earth-based telescopic photometry over phase angles 2° ≤ α ≤ 25° with Galileo...
Authors
P. Helfenstein, J. Veverka, P.C. Thomas, D.P. Simonelli, P. Lee, K. Klaasen, T. V. Johnson, H. Breneman, J.W. Head, S. Murchie, F. Fanale, M. Robinson, B. Clark, J. Granahan, H. Garbeil, A. S. McEwen, Randolph L. Kirk, M. Davies, G. Neukum, S. Mottola, R. Wagner, M. Belton, C. Chapman, C. Pilcher
Increased pressure from rising bubbles as a mechanism for remotely triggered seismicity Increased pressure from rising bubbles as a mechanism for remotely triggered seismicity
Aftershocks of large earthquakes tend to occur close to the main rupture zone, and can be used to constrain its dimensions. But following the 1992 Landers earthquake (magnitude M(w) = 7.3) in southern California, many aftershocks were reported in areas remote from the mainshock. Intriguingly, this remote seismicity occurred in small clusters near active volcanic and geothermal systems...
Authors
A. T. Linde, I. S. Sacks, M.J.S. Johnston, D.P. Hill, R.G. Bilham
Eruptive history and petrology of Mount Drum volcano, Wrangell Mountains, Alaska Eruptive history and petrology of Mount Drum volcano, Wrangell Mountains, Alaska
Mount Drum is one of the youngest volcanoes in the subduction-related Wrangell volcanic field (80x200 km) of southcentral Alaska. It lies at the northwest end of a series of large, andesite-dominated shield volcanoes that show a northwesterly progression of age from 26 Ma near the Alaska-Yukon border to about 0.2 Ma at Mount Drum. The volcano was constructed between 750 and 250 ka during...
Authors
D.H. Richter, E. J. Moll-Stalcup, T. P. Miller, M. A. Lanphere, G. B. Dalrymple, R. L. Smith
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