Publications
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Crustal subsidence and extension and Medicine Lake volcano, northern California
The pattern of historical ground deformation, seismicity, and crustal structure near Medicine Lake volcano illustrates a close relation between magmatism and tectonism near the margin of the Cascade volcanic chain and the Basin and Range tectonic province. Between leveling surveys in 1954 and 1989 the summit of Medicine Lake volcano subsided 389±43 mm with respect to a reference bench mark 40 km t
Authors
Daniel Dzurisin, Julie M. Donnelly-Nolan, John R. Evans, Stephen R. Walter
Degassing and differentiation in subglacial volcanoes, Iceland
Within the neovolcanic zones of Iceland many volcanoes grew upward through icecaps that have subsequently melted. These steep-walled and flat-topped basaltic subglacial volcanoes, called tuyas, are composed of a lower sequence of subaqueously erupted, pillowed lavas overlain by breccias and hyaloclastites produced by phreatomagmatic explosions in shallow water, capped by a subaerially erupted lava
Authors
James G. Moore, L. C. Calk
Channel hydraulics and energy expenditure in channel adjustment; Elk Rock Reach, North Fork Toutle River, Washington
No abstract available.
Authors
Andrew Simon
Geology and petrology of Mahukona Volcano, Hawaii
The submarine Mahukona Volcano, west of the island of Hawaii, is located on the Loa loci line between Kahoolawe and Hualalai Volcanoes. The west rift zone ridge of the volcano extends across a drowned coral reef at about-1150 m and a major slope break at about-1340 m, both of which represent former shoreines. The summit of the volcano apparently reached to about 250 m above sea level (now at-1100
Authors
D. A. Clague, James G. Moore
Hydrologic monitoring for effects of geothermal and ground-water development, Long Valley caldera, California
No abstract available.
Authors
C. D. Farrar, D. L. Lyster
Documented historical landslide dams from around the world
This data compilation consists of dBase IV1 data files of the location, date, triggering mechanism, kind, size, failure time and mechanism, breach dimensions, subsequent controls, materials, and references for 463 historical landslide dams and associated natural reservoirs that have been recorded throughout the World. The data base presented in this report is a compilation of information on the ch
Authors
John E. Costa, Robert L. Schuster
Volcanologic investigations in the Commonwealth of the Northern Mariana Islands, September-October 1990
U.S. Geological Survey volcanologists examined the ten volcanoes in the active Mariana Arc north of Saipan in May 1992, at the request of the Governor and the Disaster Control Office of the Commonwealth of the Northern Mariana Islands (CNMI). A shallow earthquake swarm on Anatahan in March-April 1990 and reports of possible new fuming on Agrigan in August 1990 had prompted the evacuation of all CN
Authors
Richard B. Moore, R. Y. Koyanagi, M. K. Sako, F. A. Trusdell, George Kojima, R. L. Ellorda, S. K. Zane
Map showing the distribution of debris flows during the New Year's Eve storm of 1987-1988 in southeastern Oahu, Hawaii
No abstract available.
Authors
Stephen D. Ellen, Richard M. Iverson, Thomas C. Pierson
Hawaiian Volcano Observatory: Summary 90 part I. Seismic data, January to December 1990
No abstract available.
Authors
Alvin H. Tomori, J. S. Nakata, P. G. Okubo, W. R. Tanigawa, J. P. Tokuuke, Thomas L. Wright
Uranium and minor-element partitioning in Fe-Ti oxides and zircon from partially melted granodiorite, Crater Lake, Oregon
Crystal-liquid partitioning in Fe-Ti oxides and zircon was studied in partially melted granodiorite blocks ejected during the climactic eruption of Mt. Mazama (Crater Lake), Oregon. The blocks, which contain up to 33% rhyolite glass (75 wt% SiO2), are interpreted to be portions of the magma chamber walls that were torn off during eruption. The glass is clear and well homogenized for all measured e
Authors
T.Z.L. Tourrette, D.S. Burnett, C. R. Bacon
Calc-alkaline, shoshonitic, and primitive tholeiitic lavas from monogenetic volcanoes near Crater Lake, Oregon
Quaternary monogenetic volcanism in the High Cascades of Oregon is manifested by cinder cones, lava fields, and small shields. Near Crater Lake caldera, monogenetic lava compositions include: low-K (as low as 0·09% K2O) high-alumina olivine tholeiite (HAOT); medium-K. calc-alkaline basalt, basaltic andesite, and andesite; and shoshonitic basaltic andesite (2·1% K2O, 1750 ppm Sr at 54% SiO2). Thole
Authors
Charles R. Bacon
Chapter 14: Middle Cretaceous silicic metavolcanic rocks in the Kings Canyon area, central Sierra Nevada, California
Metamorphosed silicic volcanic and hypabyssal rocks of middle Cretaceous (110 to 100 Ma) age occur in two roof pendants in the Kings Canyon area of the central Sierra Nevada. The metavolcanic remnants are similar in age to or are only slightly older than the voluminous enclosing batholithic rocks. Thus, high to surface levels of the batholith are implied for this region. This is interesting consid
Authors
J.B. Saleeby, R. W. Kistler, Samuel Longiaru, James G. Moore, Warren J. Nokleberg