Publications
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A multiple-approach radiometric age estimate for the Rotoiti and Earthquake Flat eruptions, New Zealand, with implications for the MIS 4/3 boundary
Pyroclastic fall deposits of the paired Rotoiti and Earthquake Flat eruptions from the Taupo Volcanic Zone (New Zealand) combine to form a widespread isochronous horizon over much of northern New Zealand and the southwest Pacific. This horizon is important for correlating climatic and environmental changes during the Last Glacial period, but has been the subject of numerous disparate age estimates
Authors
C. J. N. Wilson, D.A. Rhoades, M. A. Lanphere, A.T. Calvert, Bruce F. Houghton, S.D. Weaver, J. W. Cole
Development of the California Current during the past 12,000 yr based on diatoms and silicoflagellates
Detailed diatom and silicoflagellates records in three cores from the offshore region of southern Oregon to central California reveal the evolution of the northern part of the California Current during the past 12,000 yr. The early Holocene, prior to ∼ 9 ka, was characterized by relatively warm sea surface temperatures (SST), owing to enhanced northerly flow of the subtropical waters comparable to
Authors
John A. Barron, David Bukry
New K-Ar ages for calculating end-of-shield extrusion rates at West Maui volcano, Hawaiian island chain
Thirty-seven new K–Ar ages from West Maui volcano, Hawai‘i, are used to define the waning stages of shield growth and a brief episode of postshield volcanism. All but two samples from shield-stage strata have reversed polarity magnetization, so conceivably the exposed shield is not much older than the Olduvai Normal-Polarity subchron, or about 1.8 Ma. The oldest ages obtained are in the range 1.9–
Authors
David R. Sherrod, T. Murai, Takahiro Tagami
Compositional zoning of the Bishop Tuff
Compositional data for >400 pumice clasts, organized according to eruptive sequence, crystal content, and texture, provide new perspectives on eruption and pre-eruptive evolution of the >600 km3 of zoned rhyolitic magma ejected as the Bishop Tuff during formation of Long Valley caldera. Proportions and compositions of different pumice types are given for each ignimbrite package and for the interca
Authors
W. Hildreth, C. J. N. Wilson
Electrical activity during the 2006 Mount St. Augustine volcanic eruptions
By using a combination of radio frequency time-of-arrival and interferometer measurements, we observed a sequence of lightning and electrical activity during one of Mount St. Augustine's eruptions. The observations indicate that the electrical activity had two modes or phases. First, there was an explosive phase in which the ejecta from the explosion appeared to be highly charged upon exiting the
Authors
Ronald J. Thomas, Paul R. Krehbiel, William Rison, H. E. Edens, G. D. Aulich, S.R. McNutt, Guy Tytgat, E. Clark
Discussion of The mantle plume debate in undergraduate geoscience education: Overview, history, and recommendations
No abstract available.
Authors
Robert I. Tilling
Volcanic ash plume identification using polarization lidar: Augustine eruption, Alaska
During mid January to early February 2006, a series of explosive eruptions occurred at the Augustine volcanic island off the southern coast of Alaska. By early February a plume of volcanic ash was transported northward into the interior of Alaska. Satellite imagery and Puff volcanic ash transport model predictions confirm that the aerosol plume passed over a polarization lidar (0.694 mm wavelength
Authors
Kenneth Sassen, Jiang Zhu, Peter W. Webley, K. Dean, Patrick Cobb
The question of recharge to the deep thermal reservoir underlying the geysers and hot springs of Yellowstone National Park: Chapter H in Integrated geoscience studies in Integrated geoscience studies in the Greater Yellowstone Area—Volcanic, tectonic,
The extraordinary number, size, and unspoiled beauty of the geysers and hot springs of Yellowstone National Park (the Park) make them a national treasure. The hydrology of these special features and their relation to cold waters of the Yellowstone area are poorly known. In the absence of deep drill holes, such information is available only indirectly from isotope studies. The δD-δ18O values of pre
Authors
Robert O. Rye, Alfred Hemingway Truesdell
Modeling the dynamic response of a crater glacier to lava-dome emplacement: Mount St Helens, Washington, USA
The debris-rich glacier that grew in the crater of Mount St Helens after the volcano's cataclysmic 1980 eruption was split in two by a new lava dome in 2004. For nearly six months, the eastern part of the glacier was squeezed against the crater wall as the lava dome expanded. Glacier thickness nearly doubled locally and surface speed increased substantially. As squeezing slowed and then stopped,
Authors
Stephen F. Price, Joseph S. Walder
Crisis GIS--Preparing for and responding to volcanic eruptions in the United States
No abstract available.
Authors
D.W. Ramsey, J.E. Robinson, S. P. Schilling, J.R. Schaefer, Frank A. Trusdell
Crustal deformation of the Yellowstone-Snake River Plain volcano-tectonic system-Campaign and continuous GPS observations, 1987-2004
The Yellowstone-Snake River Plain tectonomagmatic province resulted from Late Tertiary volcanism in western North America, producing three large, caldera-forming eruptions at the Yellowstone Plateau in the last 2 Myr. To understand the kinematics and geodynamics of this volcanic system, the University of Utah conducted seven GPS campaigns at 140 sites between 1987 and 2003 and installed a networ
Authors
C.M. Puskas, R. B. Smith, Charles M. Meertens, W. L. Chang
A user-friendly one-dimensional model for wet volcanic plumes
This paper presents a user-friendly graphically based numerical model of one-dimensional steady state homogeneous volcanic plumes that calculates and plots profiles of upward velocity, plume density, radius, temperature, and other parameters as a function of height. The model considers effects of water condensation and ice formation on plume dynamics as well as the effect of water added to the plu
Authors
Larry G. Mastin