Chlorine degassing during the lava dome-building eruption of Mount St. Helens, 2004-2005
Marie Edmonds, Kenneth A. McGee, Michael P. Doukas
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-27
Remote measurements of volcanic gases from the Mount St. Helens lava dome were carried out using OpenPath Fourier-Transform Infrared spectroscopy on August 31, 2005. Measurements were performed at a site ~1 km from the lava dome, which was used as a source of IR radiation. On average, during the period...
Lightning‐driven electric fields measured in the lower ionosphere: Implications for transient luminous events
Jeremy N. Thomas, Benjamin H. Barnum, Erin Lay, Robert H. Holzworth, Mengu Cho, Michael C. Kelley
2008, Journal of Geophysical Research A: Space Physics (113) 1-8
Transient luminous events above thunderstorms such as sprites, halos, and elves require large electric fields in the lower ionosphere. Yet very few in situ measurements in this region have been successfully accomplished, since it is typically too low in altitude for rockets and satellites and too high for balloons. In...
Absolute and relative locations of earthquakes at Mount St. Helens, Washington, using continuous data: Implications for magmatic processes
Weston A. Thelen, Robert S. Crosson, Kenneth C. Creager
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-4
This study uses a combination of absolute and relative locations from earthquake multiplets to investigate the seismicity associated with the eruptive sequence at Mount St. Helens between September 23, 2004, and November 20, 2004. Multiplets, a prominent feature of seismicity during this time period, occurred as volcano-tectonic, hybrid, and low-frequency...
Emission rates of CO2, SO2, and H2S, scrubbing, and preeruption excess volatiles at Mount St. Helens, 2004-2005
Terrence M. Gerlach, Kenneth A. McGee, Michael P. Doukas
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-26
Airborne surveillance of gas emissions began at Mount St. Helens on September 27, 2004. Reconnaissance measurements--SO2 column abundances and CO2 , SO2 , and H2 S concentrations--showed neither a gas plume downwind of the volcano nor gas sources within the crater. Subsequent measurements taken during the period of unrest before the eruption began...
Active faulting in the Hindu Kush and adjacent Pamir mountains: identifying complex faulting in intermountain-alpine regions
Chester A. Ruleman
2008, Conference Paper, Cryosphere & hazards for the Hindu Kush, Himalaya & Tibetean Plateau; 31 March _ 2 April 08, Kathmandu
Near-real-time information products for Mount St. Helens -- tracking the ongoing eruption
Anthony I. Qamar, Stephen Malone, Seth C. Moran, William P. Steele, Weston A. Thelen
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-3
The rapid onset of energetic seismicity on September 23, 2004, at Mount St. Helens caused seismologists at the Pacific Northwest Seismic Network and the Cascades Volcano Observatory to quickly improve and develop techniques that summarized and displayed seismic parameters for use by scientists and the general public. Such techniques included...
Pre- and post-eruptive investigations of gas and water samples from Mount St. Helens, Washington, 2002 to 2005
D. Bergfeld, William C. Evans, Kenneth A. McGee, Kurt R. Spicer
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-25
Samples of gas and water from thermal springs in Loowit and Step canyons and creeks that drain the crater at Mount St. Helens have been collected since October 2004 to monitor the flux of dissolved magmatic volatiles in the hydrologic system. The changing composition of the waters highlights a trend...
Seismicity associated with renewed dome building at Mount St. Helens, 2004-2005
Seth C. Morgan, Stephen D. Malone, Anthony I. Qamar, Weston A. Thelen, Amy K. Wright, Jacqueline Caplan-Auerbach
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-2
The reawakening of Mount St. Helens after 17 years and 11 months of slumber was heralded by a swarm of shallow (depth Md >2 earthquakes were occurring at a...
Detecting changes in riparian habitat conditions based on patterns of greenness change: A case study from the Upper San Pedro River Basin, USA
K. Bruce Jones, Curtis M. Edmonds, E. Terrence Slonecker, James Wickham, Anne Neale, Timothy G. Wade, Kurt H. Riitters, William Kepner
2008, Ecological Indicators (8) 89-99
Healthy riparian ecosystems in arid and semi-arid regions exhibit shifting patterns of vegetation in response to periodic flooding. Their conditions also depend upon the amount of grazing and other human uses. Taking advantage of these system properties, we developed and tested an approach that utilizes historical Landsat data to track changes in the patterns of greenness (Normalized Difference...
Lake Manix shorelines and Afton Canyon terraces: Implications for incision of Afton Canyon
Marith C. Reheis, Joanna L. Redwine
2008, Book chapter, Late Cenozoic Drainage History of the Southwestern Great Basin and Lower Colorado River Region: Geologic and Biotic Perspectives
Lake Manix, in south-central California, was the terminal basin of the Mojave River until the late Pleistocene, when it drained east to the Lake Mojave Basin. Based on new field observations, radiocarbon ages, and soil development, we propose modifications to previously published hypotheses on the timing of the last 543...
Hazard information management during the autumn 2004 reawakening of Mount St. Helens volcano, Washington
Carolyn L. Driedger, Christina A. Neal, Tom H. Knappenberger, Deborah H. Needham, Robert B. Harper, William P. Steele
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-24
The 2004 reawakening of Mount St. Helens quickly caught the attention of government agencies as well as the international news media and the public. Immediate concerns focused on a repeat of the catastrophic landslide and blast event of May 18, 1980, which remains a vivid memory for many individuals. Within...
Geology and Surface Processes on Titan
Ralf Jaumann, Randolph L. Kirk, Ralph D. Lorenz, Rosaly Lopes, Ellen Stofan, Elizabeth P. Turtle, Horst Uwe Keller, Charles A. Wood, Christophe Sotin, Laurence A. Soderblom, Martin G. Tomasko
2008, Book chapter, Titan from Cassini-Huygens
The surface of Titan has been revealed globally, if incompletely, by Cassini observations at infrared and radar wavelengths as well as locally by the instruments on the Huygens probe. Extended dune fields, lakes, mountainous terrain, dendritic erosion patterns and erosional remnants indicate dynamic surface processes. Valleys, small-scale gullies and rounded...
Geological and geophysical evaluation of the mechanisms of the great 1899 Yakutat Bay earthquakes
George Plafker, Wayne R. Thatcher
Jeffery T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Goran Ekstrom, editor(s)
2008, Book chapter, Active tectonics and seismic potential of Alaska
We have used tectonic, geologic, and seismologic observations to reevaluate the mechanisms and seismotectonic significance of the two great (Mw = 8.1 and 8.2) September 1899 Yakutat Bay earthquakes. In their comprehensive study of these earthquakes between 1905 and 1910, Tarr and Martin (1912) showed that these events were accompanied...
Overview of the 2004 to 2006, and continuing, eruption of Mount St. Helens, Washington
William E. Scott, David R. Sherrod, Cynthia A. Gardner
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-1
Rapid onset of unrest at Mount St. Helens on September 23, 2004, initiated an uninterrupted lava-dome-building eruption that continues to the time of writing this overview (spring 2006) for a volume of papers focused on this eruption. About three weeks of intense seismic unrest and localized surface uplift, punctuated by...
Relating streamflow characteristics to specialized insectivores in the Tennessee River Valley: a regional approach
Rodney R. Knight, M. Brian Gregory, Amy K. Wales
2008, Ecohydrology (1) 394-407
Analysis of hydrologic time series and fish community data across the Tennessee River Valley identified three hydrologic metrics essential to habitat suitability and food availability for insectivorous fish communities in streams of the Tennessee River Valley: constancy (flow stability or temporal invariance), frequency of moderate flooding (frequency of habitat disturbance),...
Magmatism and tectonics in a tilted crustal section through a continental arc, eastern Transverse Ranges and southern Mojave Desert
Andrew P. Barth, J. Lawford Anderson, Carl E. Jacobson, Scott R. Paterson, Joseph L. Wooden
E. M. Duebendorfer, Eugene I. Smith, editor(s)
2008, Book chapter, Field guide to plutons, volcanoes, faults, reefs, dinosaurs, and possible glaciation in selected areas of Arizona, California, and Nevada
This field guide describes a two-and-one-half day transect, from east to west across southern California, from the Colorado River to the San Andreas fault. Recent geochronologic results for rocks along the transect indicate the spatial and temporal relationships between subarc and retroarc shortening and Cordilleran arc magmatism. The transect begins...
Subsidence reversal in a re-establish wetland in the Sacramento-San Joaquin Delta, California, USA
Robin L. Miller, Miranda S. Fram, Roger Fujii, Gail A. Wheeler
2008, San Francisco Estuary and Watershed Science (6)
The stability of levees in the Sacramento-San Joaquin Delta is threatened by continued subsidence of Delta peat islands. Up to 6 meters of land-surface elevation has been lost in the 150 years since Delta marshes were leveed and drained, primarily from oxidation of peat soils. Flooding subsided peat islands halts...
Paleoseismicity and neotectonics of the Aleutian subduction zone — An overview
Gary A. Carver, George Plafker
Jeffery T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Goran Ekstrom, editor(s)
2008, Book chapter, Active tectonics and seismic potential of Alaska
The Aleutian subduction zone is one of the most seismically active plate boundaries and the source of several of the world’s largest historic earthquakes. The structural architecture of the subduction zone varies considerably along its length. At the eastern end is a tectonically complex collision zone where the allochthonous Yakutat...
Managing public and media response to a reawakening volcano: lessons from the 2004 eruptive activity of Mount St. Helens
Peter M. Frenzen, Michael T. Matarrese
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-23
Volcanic eruptions and other infrequent, large-scale natural disturbances pose challenges and opportunities for public-land managers. In the days and weeks preceding an eruption, there can be considerable uncertainty surrounding the magnitude and areal extent of eruptive effects. At the same time, public and media interest in viewing developing events is...
Integration of regional hydrologic modeling using FORTRAN and ArcGIS
Alan L. Flint, Lorraine E. Flint
2008, Water Resources Impact (10) 31-35
Toward a time-dependent probabilistic seismic hazard analysis for Alaska
Oliver S. Boyd, Yuehua Zeng, Charles G. Bufe, Robert L. Wesson, Frederick Pollitz, Jeanne L. Hardebeck
Jeffery T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Goran Ekstrom, editor(s)
2008, Book chapter, Active tectonics and seismic potential of Alaska
We report on a time-dependent seismic hazard analysis for Alaska and the Aleutians to complement our recently completed time-independent map. Whereas the time-independent map treats all sources as statistically independent, the time-dependent analysis is based on calculations of the conditional probability of occurrence for the next 50 years by using...
Low genotyping error rates and noninvasive sampling in Bighorn Sheep
Gordon Luikart, Stephanie Zundel, Delphine Rioux, Christian Miquel, Kim A. Keating, John T. Hogg, Brian Steele, Kerry Foresman, Pierre Taberlet
2008, Journal of Wildlife Management (72) 299-304
Noninvasive DNA sampling allows studies of natural populations without disturbing the target animals. Unfortunately, high genotyping error rates often make noninvasive studies difficult. We report low error rates (0.0–7.5%/locus) when genotyping 18 microsatellite loci in only 4 multiplex polymerase chain reaction amplifications using fecal DNA from bighorn sheep (Ovis...
Seasonal and spatial variability in dissolved organic matter quantity and composition from the Yukon River basin, Alaska
R.G.M. Spencer, George Aiken, Kimberly P. Wickland, Rob Striegl, Peter J. Hernes
2008, Global Biogeochemical Cycles (22)
[1] The seasonal and spatial variability of dissolved organic matter (DOM) quantity and chemical composition were investigated in the Yukon River basin of Alaska, United States, and northwestern Canada. Dissolved organic carbon (DOC), chromophoric DOM (CDOM), and dissolved lignin phenols were measured across a range of source...
Does a boundary of the Wrangell Block extend through southern Cook Inlet and Shelikof Strait, Alaska?
Michael A. Fisher, Ray W. Sliter, Florence L. Wong
Jeffery T. Freymueller, Peter J. Haeussler, Robert L. Wesson, Goran Ekstrom, editor(s)
2008, Book chapter, Active tectonics and seismic potential of Alaska
In southcentral Alaska, the boundaries of two different tectonic blocks extend southwestward from the Denali Fault toward Cook Inlet and Shelikof Strait. We use offshore multichannel seismic reflection data and oil-well stratigraphy to evaluate whether local geologic structures are compatible with boundaries of either tectonic block and with the relative...
Note from the Hubbert Quorum
Steven E. Ingebritsen, Shaul Hurwitz, E. E. Brodsky
2008, Geofluids (8) 1-2
No abstract available....
