William E Scott
In retirement I am working on completing a geologic map of Mount Hood volcano, Oregon.
Science and Products
Filter Total Items: 70
Near-real-time information products for Mount St. Helens -- tracking the ongoing eruption Near-real-time information products for Mount St. Helens -- tracking the ongoing eruption
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 webicorders (Web-based helicorder-like...
Authors
Anthony I. Qamar, Stephen Malone, Seth C. Moran, William P. Steele, Weston A. Thelen
Absolute and relative locations of earthquakes at Mount St. Helens, Washington, using continuous data: Implications for magmatic processes Absolute and relative locations of earthquakes at Mount St. Helens, Washington, using continuous data: Implications for magmatic processes
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 earthquakes spanning a large...
Authors
Weston A. Thelen, Robert S. Crosson, Kenneth C. Creager
Hazard information management during the autumn 2004 reawakening of Mount St. Helens volcano, Washington Hazard information management during the autumn 2004 reawakening of Mount St. Helens volcano, Washington
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 several days of the onset of accelerating seismicity, media inquiries increased
Authors
Carolyn L. Driedger, Christina A. Neal, Tom H. Knappenberger, Deborah H. Needham, Robert B. Harper, William P. Steele
Emission rates of CO2, SO2, and H2S, scrubbing, and preeruption excess volatiles at Mount St. Helens, 2004-2005 Emission rates of CO2, SO2, and H2S, scrubbing, and preeruption excess volatiles at Mount St. Helens, 2004-2005
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 on October 1 and for several days after
Authors
Terrence M. Gerlach, Kenneth A. McGee, Michael P. Doukas
Seismicity associated with renewed dome building at Mount St. Helens, 2004-2005 Seismicity associated with renewed dome building at Mount St. Helens, 2004-2005
The reawakening of Mount St. Helens after 17 years and 11 months of slumber was heralded by a swarm of shallow (depth 2 earthquakes were occurring at a rate of ~1 per minute. A gradual transition from volcano-tectonic to hybrid and low-frequency events occurred along with this intensification, a characteristic of many precursory swarms at Mount St. Helens before dome-building eruptions...
Authors
Seth C. Morgan, Stephen D. Malone, Anthony I. Qamar, Weston A. Thelen, Amy K. Wright, Jacqueline Caplan-Auerbach
Pre- and post-eruptive investigations of gas and water samples from Mount St. Helens, Washington, 2002 to 2005 Pre- and post-eruptive investigations of gas and water samples from Mount St. Helens, Washington, 2002 to 2005
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 that began as early as 1994 and includes decreasing SO4 and Cl concentrations and large
Authors
D. Bergfeld, William C. Evans, Kenneth A. McGee, Kurt R. Spicer
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 70
Near-real-time information products for Mount St. Helens -- tracking the ongoing eruption Near-real-time information products for Mount St. Helens -- tracking the ongoing eruption
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 webicorders (Web-based helicorder-like...
Authors
Anthony I. Qamar, Stephen Malone, Seth C. Moran, William P. Steele, Weston A. Thelen
Absolute and relative locations of earthquakes at Mount St. Helens, Washington, using continuous data: Implications for magmatic processes Absolute and relative locations of earthquakes at Mount St. Helens, Washington, using continuous data: Implications for magmatic processes
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 earthquakes spanning a large...
Authors
Weston A. Thelen, Robert S. Crosson, Kenneth C. Creager
Hazard information management during the autumn 2004 reawakening of Mount St. Helens volcano, Washington Hazard information management during the autumn 2004 reawakening of Mount St. Helens volcano, Washington
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 several days of the onset of accelerating seismicity, media inquiries increased
Authors
Carolyn L. Driedger, Christina A. Neal, Tom H. Knappenberger, Deborah H. Needham, Robert B. Harper, William P. Steele
Emission rates of CO2, SO2, and H2S, scrubbing, and preeruption excess volatiles at Mount St. Helens, 2004-2005 Emission rates of CO2, SO2, and H2S, scrubbing, and preeruption excess volatiles at Mount St. Helens, 2004-2005
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 on October 1 and for several days after
Authors
Terrence M. Gerlach, Kenneth A. McGee, Michael P. Doukas
Seismicity associated with renewed dome building at Mount St. Helens, 2004-2005 Seismicity associated with renewed dome building at Mount St. Helens, 2004-2005
The reawakening of Mount St. Helens after 17 years and 11 months of slumber was heralded by a swarm of shallow (depth 2 earthquakes were occurring at a rate of ~1 per minute. A gradual transition from volcano-tectonic to hybrid and low-frequency events occurred along with this intensification, a characteristic of many precursory swarms at Mount St. Helens before dome-building eruptions...
Authors
Seth C. Morgan, Stephen D. Malone, Anthony I. Qamar, Weston A. Thelen, Amy K. Wright, Jacqueline Caplan-Auerbach
Pre- and post-eruptive investigations of gas and water samples from Mount St. Helens, Washington, 2002 to 2005 Pre- and post-eruptive investigations of gas and water samples from Mount St. Helens, Washington, 2002 to 2005
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 that began as early as 1994 and includes decreasing SO4 and Cl concentrations and large
Authors
D. Bergfeld, William C. Evans, Kenneth A. McGee, Kurt R. Spicer
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.