Seismic-monitoring changes and the remote deployment of seismic stations (seismic spider) at Mount St. Helens, 2004-2005
Patrick J. McChesney, Marvin R. Couchman, Seth C. Moran, Andrew B. Lockhart, Kelly J. Swinford, Richard G. LaHusen
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-7
The instruments in place at the start of volcanic unrest at Mount St. Helens in 2004 were inadequate to record the large earthquakes and monitor the explosions that occurred as the eruption developed. To remedy this, new instruments were deployed and the short-period seismic network was modified. A new method...
Petrology of the 2004-2006 Mount St. Helens lava dome -- implications for magmatic plumbing and eruption triggering
John S. Pallister, Carl R. Thornber, Katharine V. Cashman, Michael A. Clynne, Heather Lowers, Charlie Mandeville, Isabelle K. Brownfield, Gregory P. Meeker
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-30
Eighteen years after dome-forming eruptions ended in 1986, and with little warning, Mount St. Helens began to erupt again in October 2004. During the ensuing two years, the volcano extruded more than 80×106 m3 of gas-poor, crystal-rich dacite lava. The 2004-6 dacite is remarkably uniform in bulk-rock composition and, at...
Seismicity and infrasound associated with explosions at Mount St. Helens, 2004-2005
Seth C. Moran, Patrick J. McChesney, Andrew B. Lockhart
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-6
Six explosions occurred during 2004-5 in association with renewed eruptive activity at Mount St. Helens, Washington. Of four explosions in October 2004, none had precursory seismicity and two had explosion-related seismic tremor that marked the end of the explosion. However, seismicity levels dropped following each of the October explosions, providing...
Identification and evolution of the juvenile component in 2004-2005 Mount St. Helens ash
Michael C. Rowe, Carl R. Thornber, Adam J. R. Kent
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-29
Petrologic studies of volcanic ash are commonly used to identify juvenile volcanic material and observe changes in the composition and style of volcanic eruptions. During the 2004-5 eruption of Mount St. Helens, recognition of the juvenile component in ash produced by early phreatic explosions was complicated by the presence of...
Exposure assessment of veterinary medicines in aquatic systems
Chris Metcalfe, Alistair Boxall, Kathrin Fenner, Dana W. Kolpin, Eric Silberhorn, Jane Staveley
2008, Book chapter, Veterinary medicines in the environment
The release of veterinary medicines into the aquatic environment may occur through direct or indirect pathways. An example of direct release is the use of medicines in aquaculture (Armstrong et al. 2005; Davies et al. 1998), where chemicals used to treat fish are added directly to water. Indirect releases, in...
Buy it now: A hybrid internet market institution
Steven T. Anderson, Daniel Friedman, Garrett Milam, Nirvikar Singh
2008, Journal of Electronic Commerce Research (9) 137-153
This paper analyzes seller choices and outcomes in approximately 700 Internet auctions of a relatively homogeneous good. The ‘Buy it Now’ option allows the seller to convert the auction into a posted price market. We use a structural model to control for the conduct of the auction as well as...
The effect of river regulations and ground-water discharge on the ecology of the riparian corridors of the Colorado River and tributaries
Donald O. Rosenberry
2008, Conference Paper, 36th congress of the International Association of Hydrogeologists
No abstract available....
Towards monitoring land-cover and land-use changes at a global scale: the global land survey 2005
G. Gutman, Raymond A. Byrnes, J. Masek, S. Covington, C. Justice, S. Franks, Rachel Headley
2008, Photogrammetric Engineering and Remote Sensing (74) 6-10
Land cover is a critical component of the Earth system, infl uencing land-atmosphere interactions, greenhouse gas fl uxes, ecosystem health, and availability of food, fi ber, and energy for human populations. The recent Integrated Global Observations of Land (IGOL) report calls for the generation of maps documenting global land cover...
Instrumentation in remote and dangerous settings; examples using data from GPS “spider” deployments during the 2004-2005 eruption of Mount St. Helens, Washington
Richard G. LaHusen, Kelly J. Swinford, Matthew Logan, Michael Lisowski
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-16
Self-contained, single-frequency GPS instruments fitted on lightweight stations suitable for helicopter-sling payloads became a critical part of volcano monitoring during the September 2004 unrest and subsequent eruption of Mount St. Helens. Known as “spiders” because of their spindly frames, the stations were slung into the crater 29 times from September...
Analysis of GPS-measured deformation associated with the 2004-2006 dome-building eruption of Mount St. Helens, Washington
Michael Lisowski, Daniel Dzurisin, Roger P. Denlinger, Eugene Y. Iwatsubo
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-15
Detecting far-field deformation at Mount St. Helens since the crater-forming landslide and blast in 1980 has been difficult despite frequent volcanic activity and improved monitoring techniques. Between 1982 and 1991, the systematic extension of line lengths in a regional GPS trilateration network is consistent with recharge of a deep magma...
The Pleistocene eruptive history of Mount St. Helens, Washington, from 300,000 to 12,800 years before present
Michael A. Clynne, Andrew T. Calvert, Edward W. Wolfe, Russell C. Evarts, Robert J. Fleck, Marvin A. Lanphere
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-28
We report the results of recent geologic mapping and radiometric dating that add considerable detail to our understanding of the eruptive history of Mount St. Helens before its latest, or Spirit Lake, stage. New data and reevaluation of earlier work indicate at least two eruptive periods during the earliest, or...
Use of a groundwater flow model to assess the location, extent, and hydrologic properties of faults in the Rialto-Colton Basin, California
Linda R. Woolfenden
Eileen Poeter, Mary C. Hill, Chunmiao Zheng, editor(s)
2008, Conference Paper, MODFLOW and More 2008: Ground water and public policy — Conference proceedings
Faults within a groundwater basin can greatly influence the direction of groundwater flow and contaminant migration. Existing steady-state and transient groundwater flow models were used to assess the location, extent, and hydrologic properties of two alternative fault configurations within the Rialto-Colton basin. Adjustments were made to the hydrologic properties of...
Ice, climate change and wildlife research in Alaska
Anthony R. DeGange
2008, Endangered Species Bulletin (33) 16-19
Not available...
Quantitative approaches to characterizing natural chemical weathering rates
Arthur F. White
Susan L. Brantley, J. D. Kubicki, Arthur F. White, editor(s)
2008, Book chapter, Kinetics of water-rock interaction
Silicate minerals, constituting more than 90% of the rocks exposed at the earth’s surface, are commonly formed under temperature and pressure conditions that make them inherently unstable in surficial environments. Undoubtedly, the most significant aspect of chemical weathering resulting from this instability is the formation of soils which makes life...
Broadband characteristics of earthquakes recorded during a dome-building eruption at Mount St. Helens, Washington, between October 2004 and May 2005
Stephen P. Horton, Robert D. Norris, Seth C. Moran
David R. Sherrod, William E. Scott, Peter H. Stauffer, editor(s)
2008, Professional Paper 1750-5
From October 2004 to May 2005, the Center for Earthquake Research and Information of the University of Memphis operated two to six broadband seismometers within 5 to 20 km of Mount St. Helens to help monitor recent seismic and volcanic activity. Approximately 57,000 earthquakes identified during the 7-month deployment had...
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...
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...
