John A. Power
John Power specializes in volcano seismology, volcano geophysics, and eruption forecasting.
Education and Certifications
Ph.D. Geophysics, University of Alaska, Fairbanks
M.S. Geophysics, University of Alaska, Fairbanks
B.A. Geology, University of Montana, Missoula
Affiliations and Memberships*
American Geophysical Union
Seismological Society of America
Science and Products
Filter Total Items: 75
Augustine Volcano - The influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present: Chapter 16 in The 2006 eruption of Augustine Volcano, Alaska
The petrology and geochemistry of 2006 eruptive products of Augustine Volcano, Alaska, have been investigated through analyses of whole-rock samples, phenocrysts, silicate melt inclusions, and matrix glasses to constrain processes of magma evolution, eruption, and degassing. Particular attention was directed toward the concentrations and geochemical relationships involving the magmatic volatile co
Authors
James D. Webster, Charlie Mandeville, Beth Goldoff, Michelle L. Coombs, Christine Tappen
Integrated satellite observations of the 2006 eruption of Augustine Volcano: Chapter 20 in The 2006 eruption of Augustine Volcano, Alaska
Satellite observations played an important role in monitoring the 2006 eruption of Augustine Volcano. It represented the first opportunity for observers to use, in an operational setting, new Web-based tools and techniques developed by the Alaska Volcano Observatory remote sensing group. The 'Okmok Algorithm' was used to analyze thermal infrared satellite data and highlight changes in the style an
Authors
John E. Bailey, Kenneson G. Dean, Jonathan Dehn, Peter W. Webley
The 2006 eruption of Augustine Volcano - Combined analyses of thermal satellite data and reduced displacement: Chapter 23 in The 2006 eruption of Augustine Volcano, Alaska
Augustine Volcano erupted explosively after 20 years of quiescence on January 11, 2006, followed by approximately 2 months of dome building and lava extrusion. This is the best monitored eruption in Alaska to date; the diverse complementary datasets gathered enable an interdisciplinary interpretation of volcanic activity. An analysis of reduced displacement (continuous measure of seismic tremor am
Authors
Saskia M. van Manen, Jonathan Dehn, Michael E. West, Stephen Blake, David A. Rothery
Lightning and electrical activity during the 2006 eruption of Augustine Volcano: Chapter 25 in The 2006 eruption of Augustine Volcano, Alaska
Lightning and other electrical activity were measured during the 2006 eruption of Augustine Volcano. We found two phases of the activity, the explosive phase corresponding to the explosive eruptions and the plume phase. We classified the lightning into three types, vent discharges, near-vent lightning, and plume lightning. Vent discharges are small, 10 to 100 m sparks, that occur at rate as great
Authors
Ronald J. Thomas, Stephen R. McNutt, Paul R. Krehbiel, William Rison, Grayden Aulich, Harald Edens, Guy Tytgat, Edward Clark
Hazard information management, interagency coordination, and impacts of the 2005-2006 eruption of Augustine Volcano: Chapter 28 in The 2006 eruption of Augustine Volcano, Alaska
Dissemination of volcano-hazard information in coordination with other Federal, State, and local agencies is a primary responsibility of the Alaska Volcano Observatory (AVO). During the 2005-6 eruption of Augustine Volcano in Alaska, AVO used existing interagency relationships and written protocols to provide hazard guidance before, during, and after eruptive events. The 2005-6 eruption was notabl
Authors
Christina A. Neal, Thomas L. Murray, John A. Power, Jennifer N. Adleman, Paul M. Whitmore, Jeffery M. Osiensky
Volcanic-ash dispersion modeling of the 2006 eruption of Augustine Volcano using the Puff model: Chapter 21 in The 2006 eruption of Augustine Volcano, Alaska
Volcanic ash is one of the major potential hazards from volcanic eruptions. It can have both short-range effects from proximal ashfall and long range impacts from volcanic ash clouds. The timely tracking and understanding of recently emitted volcanic ash clouds is important, because they can cause severe damage to jet aircraft engines and shut down major airports. Dispersion models play an importa
Authors
Peter W. Webley, Kenneson G. Dean, Jonathan Dehn, John E. Bailey, Rorik Peterson
Preliminary slope-stability analysis of Augustine Volcano: Chapter 14 in The 2006 eruption of Augustine Volcano, Alaska
Augustine Volcano has been a prolific producer of large debris avalanches during the Holocene. Originating as landslides from the steep upper edifice, these avalanches typically slide into the surrounding ocean. At least one debris avalanche that occurred in 1883 during an eruption initiated a far-traveled tsunami. The possible occurrence of another edifice collapse and ensuing tsunami was a conce
Authors
Mark E. Reid, Dianne L. Brien, Christopher F. Waythomas
High-resolution satellite and airborne thermal infrared imaging of the 2006 eruption of Augustine Volcano: Chapter 22 in The 2006 eruption of Augustine Volcano, Alaska
Thermal infrared (TIR) images provided a timely pre- and syn-eruption record of summit changes, lava flow emplacement, and pyroclastic-flow-deposit distribution during the Alaska Volcano Observatory's (AVO) response to the 2006 eruption of Augustine Volcano. A series of images from both handheld and helicopter mounted forward looking infrared radiometers (FLIR) captured detailed views during a ser
Authors
Rick L. Wessels, Michelle L. Coombs, David J. Schneider, Jonathan Dehn, Michael S. Ramsey
Geodetic constraints on magma movement and withdrawal during the 2006 eruption of Augustine Volcano: Chapter 17 in The 2006 eruption of Augustine Volcano, Alaska
For the first time in the United States, a modern geodetic network of continuously recording Global Positioning System (GPS) receivers has measured a complete eruption cycle at a stratovolcano, Augustine Volcano in Alaska, from the earliest precursory unrest through the return to background quiescence. The on-island network consisted of five continuously recording, telemetered GPS stations, four c
Authors
Peter F. Cervelli, Thomas J. Fournier, Jeff T. Freymueller, John A. Power, Michael Lisowski, Benjamin A. Pauk
Characterizing pyroclastic-flow interactions with snow and water using environmental magnetism at Augustine Volcano: Chapter 11 in The 2006 eruption of Augustine Volcano, Alaska
In-place measurements of environmental magnetic susceptibility of pyroclastic flows, surges and lahars emplaced during the 2006 eruption of Augustine Volcano show that primary volume magnetic susceptibilities of pyroclastic materials decreased where the flows encountered water and steam. The Rocky Point pyroclastic flow, the largest flow of the eruption sequence, encountered a small pond near the
Authors
James E. Beget
Pyroclastic flows, lahars, and mixed avalanches generated during the 2006 eruption of Augustine Volcano: Chapter 10 in The 2006 eruption of Augustine Volcano, Alaska
Each of the three phases of the 2006 eruption at Augustine Volcano had a distinctive eruptive style and flowage deposits. From January 11 to 28, the explosive phase comprised short vulcanian eruptions that punctuated dome growth and produced volcanowide pyroclastic flows and more energetic hot currents whose mobility was influenced by efficient mixing with and vaporization of snow. Initially, hot
Authors
James W. Vallance, Katharine F. Bull, Michelle L. Coombs
Timing, distribution, and volume of proximal products of the 2006 eruption of Augustine Volcano: Chapter 8 in The 2006 eruption of Augustine Volcano, Alaska
During and after the 2006 eruption of Augustine Volcano, we compiled a geologic map and chronology of new lava and flowage deposits using observational flights, oblique and aerial photography, infrared imaging, satellite data, and field investigations. After approximately 6 months of precursory activity, the explosive phase of the eruption commenced with two explosions on January 11, 2006 (events
Authors
Michelle L. Coombs, Katharine F. Bull, James W. Vallance, David J. Schneider, Evan E. Thoms, Rick L. Wessels, Robert G. McGimsey
Science and Products
Filter Total Items: 75
Augustine Volcano - The influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present: Chapter 16 in The 2006 eruption of Augustine Volcano, Alaska
The petrology and geochemistry of 2006 eruptive products of Augustine Volcano, Alaska, have been investigated through analyses of whole-rock samples, phenocrysts, silicate melt inclusions, and matrix glasses to constrain processes of magma evolution, eruption, and degassing. Particular attention was directed toward the concentrations and geochemical relationships involving the magmatic volatile co
Authors
James D. Webster, Charlie Mandeville, Beth Goldoff, Michelle L. Coombs, Christine Tappen
Integrated satellite observations of the 2006 eruption of Augustine Volcano: Chapter 20 in The 2006 eruption of Augustine Volcano, Alaska
Satellite observations played an important role in monitoring the 2006 eruption of Augustine Volcano. It represented the first opportunity for observers to use, in an operational setting, new Web-based tools and techniques developed by the Alaska Volcano Observatory remote sensing group. The 'Okmok Algorithm' was used to analyze thermal infrared satellite data and highlight changes in the style an
Authors
John E. Bailey, Kenneson G. Dean, Jonathan Dehn, Peter W. Webley
The 2006 eruption of Augustine Volcano - Combined analyses of thermal satellite data and reduced displacement: Chapter 23 in The 2006 eruption of Augustine Volcano, Alaska
Augustine Volcano erupted explosively after 20 years of quiescence on January 11, 2006, followed by approximately 2 months of dome building and lava extrusion. This is the best monitored eruption in Alaska to date; the diverse complementary datasets gathered enable an interdisciplinary interpretation of volcanic activity. An analysis of reduced displacement (continuous measure of seismic tremor am
Authors
Saskia M. van Manen, Jonathan Dehn, Michael E. West, Stephen Blake, David A. Rothery
Lightning and electrical activity during the 2006 eruption of Augustine Volcano: Chapter 25 in The 2006 eruption of Augustine Volcano, Alaska
Lightning and other electrical activity were measured during the 2006 eruption of Augustine Volcano. We found two phases of the activity, the explosive phase corresponding to the explosive eruptions and the plume phase. We classified the lightning into three types, vent discharges, near-vent lightning, and plume lightning. Vent discharges are small, 10 to 100 m sparks, that occur at rate as great
Authors
Ronald J. Thomas, Stephen R. McNutt, Paul R. Krehbiel, William Rison, Grayden Aulich, Harald Edens, Guy Tytgat, Edward Clark
Hazard information management, interagency coordination, and impacts of the 2005-2006 eruption of Augustine Volcano: Chapter 28 in The 2006 eruption of Augustine Volcano, Alaska
Dissemination of volcano-hazard information in coordination with other Federal, State, and local agencies is a primary responsibility of the Alaska Volcano Observatory (AVO). During the 2005-6 eruption of Augustine Volcano in Alaska, AVO used existing interagency relationships and written protocols to provide hazard guidance before, during, and after eruptive events. The 2005-6 eruption was notabl
Authors
Christina A. Neal, Thomas L. Murray, John A. Power, Jennifer N. Adleman, Paul M. Whitmore, Jeffery M. Osiensky
Volcanic-ash dispersion modeling of the 2006 eruption of Augustine Volcano using the Puff model: Chapter 21 in The 2006 eruption of Augustine Volcano, Alaska
Volcanic ash is one of the major potential hazards from volcanic eruptions. It can have both short-range effects from proximal ashfall and long range impacts from volcanic ash clouds. The timely tracking and understanding of recently emitted volcanic ash clouds is important, because they can cause severe damage to jet aircraft engines and shut down major airports. Dispersion models play an importa
Authors
Peter W. Webley, Kenneson G. Dean, Jonathan Dehn, John E. Bailey, Rorik Peterson
Preliminary slope-stability analysis of Augustine Volcano: Chapter 14 in The 2006 eruption of Augustine Volcano, Alaska
Augustine Volcano has been a prolific producer of large debris avalanches during the Holocene. Originating as landslides from the steep upper edifice, these avalanches typically slide into the surrounding ocean. At least one debris avalanche that occurred in 1883 during an eruption initiated a far-traveled tsunami. The possible occurrence of another edifice collapse and ensuing tsunami was a conce
Authors
Mark E. Reid, Dianne L. Brien, Christopher F. Waythomas
High-resolution satellite and airborne thermal infrared imaging of the 2006 eruption of Augustine Volcano: Chapter 22 in The 2006 eruption of Augustine Volcano, Alaska
Thermal infrared (TIR) images provided a timely pre- and syn-eruption record of summit changes, lava flow emplacement, and pyroclastic-flow-deposit distribution during the Alaska Volcano Observatory's (AVO) response to the 2006 eruption of Augustine Volcano. A series of images from both handheld and helicopter mounted forward looking infrared radiometers (FLIR) captured detailed views during a ser
Authors
Rick L. Wessels, Michelle L. Coombs, David J. Schneider, Jonathan Dehn, Michael S. Ramsey
Geodetic constraints on magma movement and withdrawal during the 2006 eruption of Augustine Volcano: Chapter 17 in The 2006 eruption of Augustine Volcano, Alaska
For the first time in the United States, a modern geodetic network of continuously recording Global Positioning System (GPS) receivers has measured a complete eruption cycle at a stratovolcano, Augustine Volcano in Alaska, from the earliest precursory unrest through the return to background quiescence. The on-island network consisted of five continuously recording, telemetered GPS stations, four c
Authors
Peter F. Cervelli, Thomas J. Fournier, Jeff T. Freymueller, John A. Power, Michael Lisowski, Benjamin A. Pauk
Characterizing pyroclastic-flow interactions with snow and water using environmental magnetism at Augustine Volcano: Chapter 11 in The 2006 eruption of Augustine Volcano, Alaska
In-place measurements of environmental magnetic susceptibility of pyroclastic flows, surges and lahars emplaced during the 2006 eruption of Augustine Volcano show that primary volume magnetic susceptibilities of pyroclastic materials decreased where the flows encountered water and steam. The Rocky Point pyroclastic flow, the largest flow of the eruption sequence, encountered a small pond near the
Authors
James E. Beget
Pyroclastic flows, lahars, and mixed avalanches generated during the 2006 eruption of Augustine Volcano: Chapter 10 in The 2006 eruption of Augustine Volcano, Alaska
Each of the three phases of the 2006 eruption at Augustine Volcano had a distinctive eruptive style and flowage deposits. From January 11 to 28, the explosive phase comprised short vulcanian eruptions that punctuated dome growth and produced volcanowide pyroclastic flows and more energetic hot currents whose mobility was influenced by efficient mixing with and vaporization of snow. Initially, hot
Authors
James W. Vallance, Katharine F. Bull, Michelle L. Coombs
Timing, distribution, and volume of proximal products of the 2006 eruption of Augustine Volcano: Chapter 8 in The 2006 eruption of Augustine Volcano, Alaska
During and after the 2006 eruption of Augustine Volcano, we compiled a geologic map and chronology of new lava and flowage deposits using observational flights, oblique and aerial photography, infrared imaging, satellite data, and field investigations. After approximately 6 months of precursory activity, the explosive phase of the eruption commenced with two explosions on January 11, 2006 (events
Authors
Michelle L. Coombs, Katharine F. Bull, James W. Vallance, David J. Schneider, Evan E. Thoms, Rick L. Wessels, Robert G. McGimsey
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government