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
Catalog of earthquake parameters and description of seismograph and infrasound stations at Alaskan volcanoes—January 1, 2013, through December 31, 2017
Between January 1, 2013, and December 31, 2017, the Alaska Volcano Observatory (AVO) located a total of 28,172 earthquakes at volcanoes in Alaska. The annual totals are 3,840, 5,819, 5,297, 6,151, and 7,065 earthquakes for the years 2013 through 2017, respectively. This represents an average of 5,634 earthquakes per year, which is comparable to the yearly number of earthquakes AVO located in the p
Authors
James P. Dixon, Scott D. Stihler, Matthew M. Haney, John J. Lyons, Dane M. Ketner, Katherine M. Mulliken, Thomas Parker, John Power
A unified catalog of earthquake hypocenters and magnitudes at volcanoes in Alaska—1989 to 2018
The Alaska Volcano Observatory (AVO) has maintained an earthquake catalog since 1989 that now contains over 120,000 hypocenters and magnitudes that occurred near Alaskan volcanoes. Since 1989 the seismic instrumentation and data acquisition and processing techniques have undergone numerous changes as computer systems and seismic processing software have advanced and evolved. In this report we reca
Authors
John Power, Paul A. Friberg, Matthew M. Haney, Thomas Parker, Scott D. Stihler, James P. Dixon
Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2012
Between January 1 and December 31, 2012, the Alaska Volcano Observatory located 4,787 earthquakes, of which 4,211 occurred within 20 kilometers of the 33 volcanoes monitored by a seismograph network. There was significant seismic activity at Iliamna, Kanaga, and Little Sitkin volcanoes in 2012. Instrumentation highlights for this year include the implementation of the Advanced National Seismic Sys
Authors
James P. Dixon, Scott D. Stihler, John A. Power, Matthew M. Haney, Tom Parker, Cheryl Searcy, Stephanie Prejean
Seismic observations of Redoubt Volcano, Alaska - 1989-2010 and a conceptual model of the Redoubt magmatic system
Seismic activity at Redoubt Volcano, Alaska, has been closely monitored since 1989 by a network of five to ten seismometers within 22 km of the volcano's summit. Major eruptions occurred in 1989-1990 and 2009 and were characterized by large volcanic explosions, episodes of lava dome growth and failure, pyroclastic flows, and lahars.
Seismic features of the 1989-1990 eruption were 1) weak precurso
Authors
John A. Power, Scott D. Stihler, Bernard A. Chouet, Matthew M. Haney, D.M. Ketner
Source characterization for an explosion during the 2009 eruption of Redoubt Volcano from very-long-period seismic waves
The 2009 eruption of Redoubt produced several very-long-period (VLP) signals associated with explosions. We invert for the source location and mechanism of an explosion at Redoubt volcano using waveform methods applied to broadband recordings. Such characterization of the source carries information on the geometry of the conduit and the physics of the explosion process. Inversions are carried out
Authors
Matthew M. Haney, Bernard A. Chouet, Phillip B. Dawson, John A. Power
Volcanic earthquakes in Alaska's national parks
Alaska’s national parks contain 11 historically active
volcanoes (Figure 2), which produce thousands of small
earthquakes every year. These earthquakes are voices
of the magmatic and geothermal systems within the
volcanoes. The Alaska Volcano Observatory (AVO), a
joint program of the U.S. Geological Survey, the Geophysical
Institute at the University of Alaska Fairbanks,
and the Alaska Division of
Authors
Stephanie G. Prejean, Seth C. Moran, John A. Power, Michael J. West
Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2011
Between January 1 and December 31, 2011, the Alaska Volcano Observatory (AVO) located 4,364 earthquakes, of which 3,651 occurred within 20 kilometers of the 33 volcanoes with seismograph subnetworks. There was no significant seismic activity above background levels in 2011 at these instrumented volcanic centers. This catalog includes locations, magnitudes, and statistics of the earthquakes located
Authors
James P. Dixon, Scott D. Stihler, John A. Power, Cheryl K. Searcy
The 2009 eruption of Redoubt Volcano, Alaska
Redoubt Volcano, an ice-covered stratovolcano on the west side of Cook Inlet, erupted in March 2009 after several months of escalating unrest. The 2009 eruption of Redoubt Volcano shares many similarities with eruptions documented most recently at Redoubt in 1966–68 and 1989–90. In each case, the eruptive phase lasted several months, consisted of multiple ashproducing explosions, produced andesiti
Authors
Katharine F. Bull, Cheryl Cameron, Michelle L. Coombs, Angie Diefenbach, Taryn Lopez, Steve McNutt, Christina A. Neal, Allison Payne, John A. Power, David J. Schneider, William E. Scott, Seth Snedigar, Glenn Thompson, Kristi L. Wallace, Christopher F. Waythomas, Peter Webley, Cynthia A. Werner
Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2010
Between January 1 and December 31, 2010, the Alaska Volcano Observatory (AVO) located 3,405 earthquakes, of which 2,846 occurred within 20 kilometers of the 33 volcanoes with seismograph subnetworks. There was no significant seismic activity in 2010 at these monitored volcanic centers. Seismograph subnetworks with severe outages in 2009 were repaired in 2010 resulting in three volcanic centers (An
Authors
James P. Dixon, Scott D. Stihler, John A. Power, Cheryl K. Searcy
Mechanism of the 1996-97 non-eruptive volcano-tectonic earthquake swarm at Iliamna Volcano, Alaska
A significant number of volcano-tectonic (VT) earthquake swarms, some of which are accompanied by ground deformation and/or volcanic gas emissions, do not culminate in an eruption. These swarms are often thought to represent stalled intrusions of magma into the mid- or shallow-level crust. Real-time assessment of the likelihood that a VT swarm will culminate in an eruption is one of the key challe
Authors
Diana Roman, John A. Power
The Augustine magmatic system as revealed by seismic tomography and relocated earthquake hypocenters from 1994 through 2009
We incorporate 14 years of earthquake data from the Alaska Volcano Observatory with data from a 1975 controlled‐source seismic experiment to obtain the three‐dimensional P and S wave velocity structure and the first high‐precision earthquake locations at Augustine Volcano to be calculated in a fully three‐dimensional velocity model. Velocity tomography shows two main features beneath Augustine: a
Authors
E.M. Syracuse, C.H. Thurber, John A. Power
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
Science and Products
Filter Total Items: 75
Catalog of earthquake parameters and description of seismograph and infrasound stations at Alaskan volcanoes—January 1, 2013, through December 31, 2017
Between January 1, 2013, and December 31, 2017, the Alaska Volcano Observatory (AVO) located a total of 28,172 earthquakes at volcanoes in Alaska. The annual totals are 3,840, 5,819, 5,297, 6,151, and 7,065 earthquakes for the years 2013 through 2017, respectively. This represents an average of 5,634 earthquakes per year, which is comparable to the yearly number of earthquakes AVO located in the p
Authors
James P. Dixon, Scott D. Stihler, Matthew M. Haney, John J. Lyons, Dane M. Ketner, Katherine M. Mulliken, Thomas Parker, John Power
A unified catalog of earthquake hypocenters and magnitudes at volcanoes in Alaska—1989 to 2018
The Alaska Volcano Observatory (AVO) has maintained an earthquake catalog since 1989 that now contains over 120,000 hypocenters and magnitudes that occurred near Alaskan volcanoes. Since 1989 the seismic instrumentation and data acquisition and processing techniques have undergone numerous changes as computer systems and seismic processing software have advanced and evolved. In this report we reca
Authors
John Power, Paul A. Friberg, Matthew M. Haney, Thomas Parker, Scott D. Stihler, James P. Dixon
Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2012
Between January 1 and December 31, 2012, the Alaska Volcano Observatory located 4,787 earthquakes, of which 4,211 occurred within 20 kilometers of the 33 volcanoes monitored by a seismograph network. There was significant seismic activity at Iliamna, Kanaga, and Little Sitkin volcanoes in 2012. Instrumentation highlights for this year include the implementation of the Advanced National Seismic Sys
Authors
James P. Dixon, Scott D. Stihler, John A. Power, Matthew M. Haney, Tom Parker, Cheryl Searcy, Stephanie Prejean
Seismic observations of Redoubt Volcano, Alaska - 1989-2010 and a conceptual model of the Redoubt magmatic system
Seismic activity at Redoubt Volcano, Alaska, has been closely monitored since 1989 by a network of five to ten seismometers within 22 km of the volcano's summit. Major eruptions occurred in 1989-1990 and 2009 and were characterized by large volcanic explosions, episodes of lava dome growth and failure, pyroclastic flows, and lahars.
Seismic features of the 1989-1990 eruption were 1) weak precurso
Authors
John A. Power, Scott D. Stihler, Bernard A. Chouet, Matthew M. Haney, D.M. Ketner
Source characterization for an explosion during the 2009 eruption of Redoubt Volcano from very-long-period seismic waves
The 2009 eruption of Redoubt produced several very-long-period (VLP) signals associated with explosions. We invert for the source location and mechanism of an explosion at Redoubt volcano using waveform methods applied to broadband recordings. Such characterization of the source carries information on the geometry of the conduit and the physics of the explosion process. Inversions are carried out
Authors
Matthew M. Haney, Bernard A. Chouet, Phillip B. Dawson, John A. Power
Volcanic earthquakes in Alaska's national parks
Alaska’s national parks contain 11 historically active
volcanoes (Figure 2), which produce thousands of small
earthquakes every year. These earthquakes are voices
of the magmatic and geothermal systems within the
volcanoes. The Alaska Volcano Observatory (AVO), a
joint program of the U.S. Geological Survey, the Geophysical
Institute at the University of Alaska Fairbanks,
and the Alaska Division of
Authors
Stephanie G. Prejean, Seth C. Moran, John A. Power, Michael J. West
Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2011
Between January 1 and December 31, 2011, the Alaska Volcano Observatory (AVO) located 4,364 earthquakes, of which 3,651 occurred within 20 kilometers of the 33 volcanoes with seismograph subnetworks. There was no significant seismic activity above background levels in 2011 at these instrumented volcanic centers. This catalog includes locations, magnitudes, and statistics of the earthquakes located
Authors
James P. Dixon, Scott D. Stihler, John A. Power, Cheryl K. Searcy
The 2009 eruption of Redoubt Volcano, Alaska
Redoubt Volcano, an ice-covered stratovolcano on the west side of Cook Inlet, erupted in March 2009 after several months of escalating unrest. The 2009 eruption of Redoubt Volcano shares many similarities with eruptions documented most recently at Redoubt in 1966–68 and 1989–90. In each case, the eruptive phase lasted several months, consisted of multiple ashproducing explosions, produced andesiti
Authors
Katharine F. Bull, Cheryl Cameron, Michelle L. Coombs, Angie Diefenbach, Taryn Lopez, Steve McNutt, Christina A. Neal, Allison Payne, John A. Power, David J. Schneider, William E. Scott, Seth Snedigar, Glenn Thompson, Kristi L. Wallace, Christopher F. Waythomas, Peter Webley, Cynthia A. Werner
Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2010
Between January 1 and December 31, 2010, the Alaska Volcano Observatory (AVO) located 3,405 earthquakes, of which 2,846 occurred within 20 kilometers of the 33 volcanoes with seismograph subnetworks. There was no significant seismic activity in 2010 at these monitored volcanic centers. Seismograph subnetworks with severe outages in 2009 were repaired in 2010 resulting in three volcanic centers (An
Authors
James P. Dixon, Scott D. Stihler, John A. Power, Cheryl K. Searcy
Mechanism of the 1996-97 non-eruptive volcano-tectonic earthquake swarm at Iliamna Volcano, Alaska
A significant number of volcano-tectonic (VT) earthquake swarms, some of which are accompanied by ground deformation and/or volcanic gas emissions, do not culminate in an eruption. These swarms are often thought to represent stalled intrusions of magma into the mid- or shallow-level crust. Real-time assessment of the likelihood that a VT swarm will culminate in an eruption is one of the key challe
Authors
Diana Roman, John A. Power
The Augustine magmatic system as revealed by seismic tomography and relocated earthquake hypocenters from 1994 through 2009
We incorporate 14 years of earthquake data from the Alaska Volcano Observatory with data from a 1975 controlled‐source seismic experiment to obtain the three‐dimensional P and S wave velocity structure and the first high‐precision earthquake locations at Augustine Volcano to be calculated in a fully three‐dimensional velocity model. Velocity tomography shows two main features beneath Augustine: a
Authors
E.M. Syracuse, C.H. Thurber, John A. Power
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
*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