Publications
Filter Total Items: 2705
Semiquantitative spectrographic analyses of stream-sediment samples from the Wenaha Tucannon Wilderness, Washington and Oregon
No abstract available.
Authors
Donald A. Swanson, Thomas L. Wright
Time-predictable bimodal volcanism in the Coso Range, California
The bimodal Pleistocene part of the Coso volcanic field has erupted rhyolite and basalt at constant long-term rates during the past ∼0.5 m.y. Both basalt and high-silica rhyolite were erupted in several independent, geologically brief episodes. The interval between eruptions of rhyolite was proportional to the volume of the preceding eruption. Basaltic eruptions appear to have followed a similar p
Authors
Charles R. Bacon
Cenozoic silicoflagellates from offshore Guatemala, Deep Sea Drilling Project Site 495
Diverse lower Miocene to Pleistocene silicoflagellate assemblages occur at Deep Sea Drilling Project Site 495, but many samples are dominated by one or two taxa. Low-latitude zonation can be applied throughout. Cool-indicating Distephanus speculum s. ampl. is only abundant in the upper Miocene; however, relative paleotemperature values (Ts) suggest temperature extremes in the lower Miocene similar
Authors
David Bukry
Diverse basalt types from Loihi seamount, Hawaii
Loihi seamount is the southeasternmost active volcano in the Hawaiian-Emperor volcanic chain. The seamount is considered representative of the early phase of Hawaiian volcanism because of its youth, small size, and location near the melting anomaly. Seventeen dredge stations recovered transitional basalt, alkalic basalt, and basanite, in addition to the expected tholeiitic basalt. Four flows of al
Authors
James G. Moore, D. A. Clague, W. R. Normark
Geothermal systems of the Cascade Range
In the central and southern Cascade Range, plate convergence is oblique, and Quaternary volcanism produces mostly basalt and mafic andesite; large andesite-dacite composite volcanoes and silicic dome fields occur in restricted areas of long-lived igneous activity. To the north, plate convergence is normal, producing widely spaced centers in which mafic lavas are minor. Most Cascade volcanoes are s
Authors
L.J. Muffler, Charles R. Bacon, W. A. Duffield
Tilt measurements at Long Valley caldera, California, May-August 1982
The Mammoth Lakes area in east-central California has experienced unusual seismicity and ground deformation since 1978, highlighted by four M>6 earthquakes in May 1980 and by the discovery soon thereafter of a broad uplift within Long Valley caldera. Recurrent seismic swarms during June 1980-May 1982 raised concern over the possibility of renewed volcanic activity in the foreseeable future, prompt
Authors
Daniel Dzurisin, K. V. Cashman, D. A. Johnston, Arthur G. Sylvester
Chemistry and isotope ratios of sulfur in basalts and volcanic gases at Kilauea volcano, Hawaii
Eighteen basalts and some volcanic gases from the submarine and subaerial parts of Kilauea volcano were analyzed for the concentration and isotope ratios of sulfur. By means of a newly developed technique, sulfide and sulfate sulfur in the basalts were separately but simultaneously determined. The submarine basalt has 700 ± 100 ppm total sulfur with δ34SΣs of ‰0.7 ± 0.1 ‰. The sulfate/sulfide mola
Authors
H. Sakai, T. J. Casadevall, J. G. Moore
Aeromagnetic map of Mt. St. Helens, Washington: Post May 1980 eruption
No abstract available.
Authors
Age of the Coso Formation, Inyo County, California
No abstract available.
Authors
Charles R. Bacon, D.M. Giovannetti, W. A. Duffield, G. B. Dalrymple, Robert E. Drake
A method for estimating intermediate and long-term risks from volcanic activity, with an example from Mount St. Helens, Washington
No abstract available.
Authors
C. G. Newhall
Self-potential surveys related to probable geothermal anomalies, Hualalai Volcano, Hawaii
No abstract available.
Authors
D. B. Jackson, M. K. Sako
Geodetic measurement of crustal deformation on the San Andreas, Hayward, and Calaveras faults near San Francisco, California
Analysis of a geodetic network of 115 lines crossing the San Andreas, Hayward, and Calaveras faults in the vicinity of San Francisco Bay and measured repeatedly between 1970 and 1980 has revealed details about the accommodation of relative plate motion in this area. The most striking result is that the deformation is not uniformly distributed across the area. In the east bay, along the Hayward and
Authors
W. H. Prescott, Michael Lisowski, James C. Savage