Publications
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Hand-Hewn Granite Basins at Native American Saltworks, Sierra Nevada, California
This site in the northern Sierra Nevada contains about 369 circular basins carved in fresh, glaciated granodioritic bedrock, with 325 basins crowded together in an area of 2,700 m2 on the main terrace. These terrace basins have a median average diameter of 125 cm (80 percent between 100 and 160 cm) and a median depth of 75-80 cm. They show a strong congruity to similar granitic basins in the south
Authors
James G. Moore, Michael F. Diggles
Hydrothermal processes above the Yellowstone magma chamber: Large hydrothermal systems and large hydrothermal explosions
Hydrothermal explosions are violent and dramatic events resulting in the rapid ejection of boiling water, steam, mud, and rock fragments from source craters that range from a few meters up to more than 2 km in diameter; associated breccia can be emplaced as much as 3 to 4 km from the largest craters. Hydrothermal explosions occur where shallow interconnected reservoirs of steam- and liquid-saturat
Authors
Lisa A. Morgan, Pat Shanks, Kenneth L. Pierce
Buckets of ash track tephra flux from Halema'uma'u Crater, Hawai'i
The 2008–2009 eruption at Kīlauea Volcano's summit made news because of its eight small discrete explosive eruptions and noxious volcanic smog (vog) created from outgassing sulfur dioxide. Less appreciated is the ongoing, weak, but continuous output of tephra, primarily ash, from the new open vent in Halema'uma'u Crater. This tephra holds clues to processes causing the eruption and forming the new
Authors
Don Swanson, Kelly M. Wooten, Tim R. Orr
Proceedings of the XIIIth IAGA Workshop on Geomagnetic Observatory Instruments, Data Acquisition, and Processing
The thirteenth biennial International Association of Geomagnetism and Aeronomy (IAGA) Workshop on Geomagnetic Observatory Instruments, Data Acquisition and Processing was held in the United States for the first time on June 9-18, 2008. Hosted by the U.S. Geological Survey's (USGS) Geomagnetism Program, the workshop's measurement session was held at the Boulder Observatory and the scientific sessio
Authors
Jeffrey J. Love
Saddle Mountain fault deformation zone, Olympic Peninsula, Washington: Western boundary of the Seattle uplift
The Saddle Mountain fault, first recognized in the early 1970s, is now well mapped in the Hoodsport area, southeastern Olympic Peninsula (northwestern United States), on the basis of light detection and ranging (LIDAR) surveys, aerial photography, and trench excavations. Drowned trees and trench excavations demonstrate that the Saddle Mountain fault produced a MW 6.5–7.0 earthquake 1000–1300 yr ag
Authors
Richard J. Blakely, Brian L. Sherrod, Jonathan F. Hughes, Megan L. Anderson, Ray E Wells, Craig S. Weaver
Coastal change along the shore of northeastern South Carolina— The South Carolina Coastal Erosion Study
The U.S. Geological Survey, in cooperation with the South Carolina Sea Grant Consortium, conducted a 7-year, multidisciplinary study of coastal erosion in northeastern South Carolina. Shoreline behavior along the coast of Long Bay is dictated by waves, tidal currents, and sediment supply that act within the overall constraints of the regional geologic setting. Beaches are thin ribbons of sand that
Authors
W. C. Schwab, P. T. Gayes, R.A. Morton, N. W. Driscoll, W. E. Baldwin, W. A. Barnhardt, J. F. Denny, M.S. Harris, M.P. Katuna, T.R. Putney, G. Voulgaris, J.C. Warner, E.E. Wright
Community exposure to lahar hazards from Mount Rainier, Washington
Geologic evidence of past events and inundation modeling of potential events suggest that lahars associated with Mount Rainier, Washington, are significant threats to downstream development. To mitigate potential impacts of future lahars and educate at-risk populations, officials need to understand how communities are vulnerable to these fast-moving debris flows and which individuals and communiti
Authors
Nathan J. Wood, Christopher E. Soulard
Chronology and references of volcanic eruptions and selected unrest in the United States, 1980-2008
The United States ranks as one of the top countries in the world in the number of young, active volcanoes within its borders. The United States, including the Commonwealth of the Northern Mariana Islands, is home to approximately 170 geologically active (age
Authors
Angela K. Diefenbach, Marianne Guffanti, John W. Ewert
Dendrogeomorphic Assessment of the Rattlesnake Gulf Landslide in the Tully Valley, Onondaga County, New York
Dendrogeomorphic techniques were used to assess soil movement within the Rattlesnake Gulf landslide in the Tully Valley of central New York during the last century. This landslide is a postglacial, slow-moving earth slide that covers 23 acres and consists primarily of rotated, laminated, glaciolacustrine silt and clay. Sixty-two increment cores were obtained from 30 hemlock (Tsuga canadensis) tree
Authors
Kathryn L. Tamulonis, William M. Kappel
Emergency Assessment of Postfire Debris-Flow Hazards for the 2009 Station Fire, San Gabriel Mountains, Southern California
This report presents an emergency assessment of potential debris-flow hazards from basins burned by the 2009 Station fire in Los Angeles County, southern California. Statistical-empirical models developed for postfire debris flows are used to estimate the probability and volume of debris-flow production from 678 drainage basins within the burned area and to generate maps of areas that may be inund
Authors
Susan H. Cannon, Joseph E. Gartner, Michael G. Rupert, John A. Michael, Dennis M. Staley, Bruce B. Worstell
Introduction to the High Resolution Imaging Science Experiment (HiRISE)
No abstract available.
Authors
Alfred S. McEwen, Kenneth E. Herkenhoff, Laszlo P. Keszthelyi
Causes and Movement of Landslides at Rainbow Creek and Rattlesnake Gulf in the Tully Valley, Onondaga County, New York
No abstract available.
Authors
Kathryn Tamulonis, William Kappel, Stephen Shaw