Publications
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Earthquakes & Volcanoes, Volume 21, Number 1, 1989: Featuring the U.S. Geological Survey's National Earthquake Information Center in Golden, Colorado, USA Earthquakes & Volcanoes, Volume 21, Number 1, 1989: Featuring the U.S. Geological Survey's National Earthquake Information Center in Golden, Colorado, USA
Earthquakes and Volcanoes is published bimonthly by the U.S. Geological Survey to provide current information on earthquakes and seismology, volcanoes, and related natural hazards of interest to both generalized and specialized readers. The Secretary of the Interior has determined that the publication of this periodical is necessary in the transaction of the public business required by...
Authors
Henry Spall, Diane C. Schnabel
Petrology of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon Petrology of the zoned calcalkaline magma chamber of Mount Mazama, Crater Lake, Oregon
Evolution of the magma chamber at Mount Mazama involved repeated recharge by two types of andesite (high-Sr and low-Sr), crystal fractionation, crystal accumulation, assimilation, and magma mixing (Bacon and Druitt 1988). This paper addresses the modal compositions, textures, mineral chemistry and magmatic temperatures of (i) products of the 6845±50 BP climactic eruption, (ii) blocks of...
Authors
T. H. Druitt, C. R. Bacon
Preliminary geologic map of the Puu Anahulu quadrangle, Hawaii Preliminary geologic map of the Puu Anahulu quadrangle, Hawaii
Vent deposits and lava flows from Hualalai Volcano and lava flows from Mauna Loa and Mauna Kea Volcanoes cover the Puu Anahulu 7 1/2-minute quadrangle. Hualalai's diffuse north-trending rift zone, marked by the large trachyte cone of Puu Waawaa and several basaltic spatter cones, is located mainly in the southwestern part of the quadrangle. Several Hualalai flows originated in the...
Authors
Richard B. Moore, David A. Clague, Wendy A. Bohrson, W. S. Wise
Guidebook for field trip to the Mount Bachelor-South Sister-Bend area, central Oregon High Cascades Guidebook for field trip to the Mount Bachelor-South Sister-Bend area, central Oregon High Cascades
No abstract available.
Authors
William E. Scott, Cynthia A. Gardner, Scott A. Lundstrom, Brittain E. Hill, Edward M. Taylor, Andrei M. Sarna-Wojcicki, Charles E. Meyer, John K. Nakata, J.L. Slate, P.C. Russell
A mechanical model for lava domes that includes a mechanism for eruptive growth A mechanical model for lava domes that includes a mechanism for eruptive growth
No abstract available.
Authors
Richard M. Iverson, Roger P. Denlinger
Preliminary map of upper Eocene to Holocene volcanic and related rocks of the Cascade Range, Oregon Preliminary map of upper Eocene to Holocene volcanic and related rocks of the Cascade Range, Oregon
Since 1979 the Geothermal Research Program of the U.S. Geological Survey has carried out multidisciplinary research in the Cascade Range. The goal of this research is to understand the geology, tectonics, and hydrology of the Cascades in order to characterize and quantify geothermal resource potential. A major goal of the program is compilation of a comprehensive geologic map of the...
Authors
David R. Sherrod, James G. Smith
Flow modeling in the Toutle River, Washington Flow modeling in the Toutle River, Washington
No abstract available.
Authors
Yasuyuki Shimizu, Randy L. Dinehart, J. Dungan Smith
Chemical analyses of volcanic rocks from monogenetic and shield volcanoes near Crater Lake, Oregon Chemical analyses of volcanic rocks from monogenetic and shield volcanoes near Crater Lake, Oregon
No abstract available.
Authors
P. E. Bruggman, C. R. Bacon, J. S. Mee, S. T. Pribble, D. F. Siems
Compositional zonation and cumulus processes in the Mount Mazama magma chamber, Crater Lake, Oregon Compositional zonation and cumulus processes in the Mount Mazama magma chamber, Crater Lake, Oregon
The 6845 ± 50 BP climactic eruption of Mount Mazama discharged 47 ± 9 km3 of vertically zoned calc-alkaline magma, affording a virtually complete section through the chamber. Evidence for two andesitic parents with different trace-element (particularly Sr) and water contents is preserved in the ejecta. Prior to eruption, a dominant volume of rhyodacite was underlain successively by high...
Authors
T. H. Druitt, Charles R. Bacon
Voluminous submarine lava flows from Hawaiian volcanoes Voluminous submarine lava flows from Hawaiian volcanoes
The GLORIA long-range sonar imaging system has revealed fields of large lava flows in the Hawaiian Trough east and south of Hawaii in water as deep as 5.5 km. Flows in the most extensive field (110 km long) have erupted from the deep submarine segment of Kilauea's east rift zone. Other flows have been erupted from Loihi and Mauna Loa. This discovery confirms a suspicion, long held from...
Authors
Robin T. Holcomb, James G. Moore, Peter W. Lipman, R.H. Belderson
Large-scale bedforms in boulder gravel produced by giant waves in Hawaii Large-scale bedforms in boulder gravel produced by giant waves in Hawaii
Approximately 105,000 yr ago (based on uranium-series dating), waves in a giant wave train swept up to an elevation of about 375 m on the island of Lanai. The waves deposited the Hulopoe Gravel, which near the present shoreline consists of basalt boulders, coral fragments, and calcareous beachrock slabs, and near the upper limit of the deposit consists of sand and shell fragments. The...
Authors
G. W. Moore, James G. Moore
The Mount Mazama climactic eruption (6900 BP) and resulting convulsive sedimentation on the continent, ocean basin, and Crater Lake caldera floor The Mount Mazama climactic eruption (6900 BP) and resulting convulsive sedimentation on the continent, ocean basin, and Crater Lake caldera floor
The climactic eruption of Mount Mazama and the resulting sedimentation may have been the most significant convulsive sedimentary event in North America during Holocene time. A collapse caldera 1,200 m deep and 10 km in diameter was formed in Mount Mazama, and its floor was covered by hundreds of meters of wall-collapse debris. Wind-blown pyroclastic ash extended 2,000 km northeast from...
Authors
C. Hans Nelson, Paul R. Carlson, Charles R. Bacon