John W. Ewert (Former Employee)
Science and Products
Filter Total Items: 32
Volcano-Monitoring Instrumentation in the United States, 2008
The United States is one of the most volcanically active countries in the world. According to the global volcanism database of the Smithsonian Institution, the United States (including its Commonwealth of the Northern Mariana Islands) is home to about 170 volcanoes that are in an eruptive phase, have erupted in historical time, or have not erupted recently but are young enough (eruptions within th
Authors
Marianne Guffanti, Angela K. Diefenbach, John W. Ewert, David W. Ramsey, Peter F. Cervelli, Steven P. Schilling
Chronology and references of volcanic eruptions and selected unrest in the United States, 1980-2008
The United States ranks as one of the top countries in the world in the number of young, active volcanoes within its borders. The United States, including the Commonwealth of the Northern Mariana Islands, is home to approximately 170 geologically active (age
Authors
Angela K. Diefenbach, Marianne Guffanti, John W. Ewert
Preliminary spreadsheet of eruption source parameters for volcanoes of the world
Volcanic eruptions that spew tephra into the atmosphere pose a hazard to jet aircraft. For this reason, the International Civil Aviation Organization (ICAO) has designated nine Volcanic Ash and Aviation Centers (VAACs) around the world whose purpose is to track ash clouds from eruptions and notify aircraft so that they may avoid these ash clouds. During eruptions, VAACs and their collaborators run
Authors
Larry G. Mastin, Marianne Guffanti, John W. Ewert, Jessica Spiegel
A multidisciplinary effort to assign realistic source parameters to models of volcanic ash-cloud transport and dispersion during eruptions
During volcanic eruptions, volcanic ash transport and dispersion models (VATDs) are used to forecast the location and movement of ash clouds over hours to days in order to define hazards to aircraft and to communities downwind. Those models use input parameters, called “eruption source parameters”, such as plume height H, mass eruption rate Ṁ, duration D, and the mass fraction m63 of erupted debri
Authors
Larry G. Mastin, Marianne C. Guffanti, R. Servranckx, P. Webley, S. Barsotti, K. Dean, A. Durant, John W. Ewert, A. Neri, W.I. Rose, David J. Schneider, Lee Siebert, B. Stunder, G. Swanson, A. Tupper, A. Volentik, Christopher F. Waythomas
The unexpected awakening of Chaitén Volcano, Chile
On 2 May 2008, a large eruption began unexpectedly at the inconspicuous Chaitén volcano in Chile's southern volcanic zone. Ash columns abruptly jetted from the volcano into the stratosphere, followed by lava dome effusion and continuous low-altitude ash plumes [Lara, 2009]. Apocalyptic photographs of eruption plumes suffused with lightning were circulated globally.
Effects of the eruption were
Authors
Simon A. Carn, John S. Zogorski, Luis Lara, John W. Ewert, Sebastian Watt, Alfred J. Prata, Ronald J. Thomas, Gustavo Villarosa
Volcano Hazards Assessment for Medicine Lake Volcano, Northern California
Medicine Lake volcano (MLV) is a very large shield-shaped volcano located in northern California where it forms part of the southern Cascade Range of volcanoes. It has erupted hundreds of times during its half-million-year history, including nine times during the past 5,200 years, most recently 950 years ago. This record represents one of the highest eruptive frequencies among Cascade volcanoes an
Authors
Julie M. Donnelly-Nolan, Manuel Nathenson, Duane E. Champion, David W. Ramsey, Jacob B. Lowenstern, John W. Ewert
System for ranking relative threats of U.S. volcanoes
A methodology to systematically rank volcanic threat was developed as the basis for prioritizing volcanoes for long-term hazards evaluations, monitoring, and mitigation activities. A ranking of 169 volcanoes in the United States and the Commonwealth of the Northern Mariana Islands (U.S. volcanoes) is presented based on scores assigned for various hazard and exposure factors. Fifteen factors define
Authors
John W. Ewert
Mount St. Helens reloaded--Applying GIS to the ongoing eruption of Mount St. Helens, Washington
No abstract available.
Authors
D.W. Ramsey, S. P. Schilling, J.E. Robinson, Julia P. Griswold, R. S. Wardell, John W. Ewert
Tephra deposits for the past 2600 years from Irazú Volcano, Costa Rica: Chapter 12 in Volcanic hazards in Central America
No abstract available.
Authors
S.K. Clark, M. K. Reagan, D.A. Trimble
Volcanic hazards in Central America
This volume is a sampling of current scientific work about volcanoes in Central America with specific application to hazards. The papers reflect a variety of international and interdisciplinary collaborations and employ new methods. The book will be of interest to a broad cross section of scientists, especially volcanologists. The volume also will interest students who aspire to work in the field
Summary of the stakeholders workshop to develop a National Volcano Early Warning System (NVEWS)
The importance of investing in monitoring, mitigation, and preparedness before natural hazards occur has been amply demonstrated by recent disasters such as the Indian Ocean Tsunami in December 2004 and Hurricane Katrina in August 2005. Playing catch-up with hazardous natural phenomena such as these limits our ability to work with public officials and the public to lessen adverse impacts. With r
Authors
Marianne Guffanti, William E. Scott, Carolyn L. Driedger, John W. Ewert
An assessment of volcanic threat and monitoring capabilities in the United States: Framework for a National Volcano Early Warning System
Executive SummaryNVEWS – a National Volcano Early Warning System – is being formulated by the Consortium of U.S. Volcano Observatories (CUSVO) to establish a proactive, fully integrated, national-scale monitoring effort that ensures the most threatening volcanoes in the United States are properly monitored in advance of the onset of unrest and at levels commensurate with the threats posed. Volcani
Authors
John W. Ewert, Marianne Guffanti, Thomas L. Murray
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: 32
Volcano-Monitoring Instrumentation in the United States, 2008
The United States is one of the most volcanically active countries in the world. According to the global volcanism database of the Smithsonian Institution, the United States (including its Commonwealth of the Northern Mariana Islands) is home to about 170 volcanoes that are in an eruptive phase, have erupted in historical time, or have not erupted recently but are young enough (eruptions within th
Authors
Marianne Guffanti, Angela K. Diefenbach, John W. Ewert, David W. Ramsey, Peter F. Cervelli, Steven P. Schilling
Chronology and references of volcanic eruptions and selected unrest in the United States, 1980-2008
The United States ranks as one of the top countries in the world in the number of young, active volcanoes within its borders. The United States, including the Commonwealth of the Northern Mariana Islands, is home to approximately 170 geologically active (age
Authors
Angela K. Diefenbach, Marianne Guffanti, John W. Ewert
Preliminary spreadsheet of eruption source parameters for volcanoes of the world
Volcanic eruptions that spew tephra into the atmosphere pose a hazard to jet aircraft. For this reason, the International Civil Aviation Organization (ICAO) has designated nine Volcanic Ash and Aviation Centers (VAACs) around the world whose purpose is to track ash clouds from eruptions and notify aircraft so that they may avoid these ash clouds. During eruptions, VAACs and their collaborators run
Authors
Larry G. Mastin, Marianne Guffanti, John W. Ewert, Jessica Spiegel
A multidisciplinary effort to assign realistic source parameters to models of volcanic ash-cloud transport and dispersion during eruptions
During volcanic eruptions, volcanic ash transport and dispersion models (VATDs) are used to forecast the location and movement of ash clouds over hours to days in order to define hazards to aircraft and to communities downwind. Those models use input parameters, called “eruption source parameters”, such as plume height H, mass eruption rate Ṁ, duration D, and the mass fraction m63 of erupted debri
Authors
Larry G. Mastin, Marianne C. Guffanti, R. Servranckx, P. Webley, S. Barsotti, K. Dean, A. Durant, John W. Ewert, A. Neri, W.I. Rose, David J. Schneider, Lee Siebert, B. Stunder, G. Swanson, A. Tupper, A. Volentik, Christopher F. Waythomas
The unexpected awakening of Chaitén Volcano, Chile
On 2 May 2008, a large eruption began unexpectedly at the inconspicuous Chaitén volcano in Chile's southern volcanic zone. Ash columns abruptly jetted from the volcano into the stratosphere, followed by lava dome effusion and continuous low-altitude ash plumes [Lara, 2009]. Apocalyptic photographs of eruption plumes suffused with lightning were circulated globally.
Effects of the eruption were
Authors
Simon A. Carn, John S. Zogorski, Luis Lara, John W. Ewert, Sebastian Watt, Alfred J. Prata, Ronald J. Thomas, Gustavo Villarosa
Volcano Hazards Assessment for Medicine Lake Volcano, Northern California
Medicine Lake volcano (MLV) is a very large shield-shaped volcano located in northern California where it forms part of the southern Cascade Range of volcanoes. It has erupted hundreds of times during its half-million-year history, including nine times during the past 5,200 years, most recently 950 years ago. This record represents one of the highest eruptive frequencies among Cascade volcanoes an
Authors
Julie M. Donnelly-Nolan, Manuel Nathenson, Duane E. Champion, David W. Ramsey, Jacob B. Lowenstern, John W. Ewert
System for ranking relative threats of U.S. volcanoes
A methodology to systematically rank volcanic threat was developed as the basis for prioritizing volcanoes for long-term hazards evaluations, monitoring, and mitigation activities. A ranking of 169 volcanoes in the United States and the Commonwealth of the Northern Mariana Islands (U.S. volcanoes) is presented based on scores assigned for various hazard and exposure factors. Fifteen factors define
Authors
John W. Ewert
Mount St. Helens reloaded--Applying GIS to the ongoing eruption of Mount St. Helens, Washington
No abstract available.
Authors
D.W. Ramsey, S. P. Schilling, J.E. Robinson, Julia P. Griswold, R. S. Wardell, John W. Ewert
Tephra deposits for the past 2600 years from Irazú Volcano, Costa Rica: Chapter 12 in Volcanic hazards in Central America
No abstract available.
Authors
S.K. Clark, M. K. Reagan, D.A. Trimble
Volcanic hazards in Central America
This volume is a sampling of current scientific work about volcanoes in Central America with specific application to hazards. The papers reflect a variety of international and interdisciplinary collaborations and employ new methods. The book will be of interest to a broad cross section of scientists, especially volcanologists. The volume also will interest students who aspire to work in the field
Summary of the stakeholders workshop to develop a National Volcano Early Warning System (NVEWS)
The importance of investing in monitoring, mitigation, and preparedness before natural hazards occur has been amply demonstrated by recent disasters such as the Indian Ocean Tsunami in December 2004 and Hurricane Katrina in August 2005. Playing catch-up with hazardous natural phenomena such as these limits our ability to work with public officials and the public to lessen adverse impacts. With r
Authors
Marianne Guffanti, William E. Scott, Carolyn L. Driedger, John W. Ewert
An assessment of volcanic threat and monitoring capabilities in the United States: Framework for a National Volcano Early Warning System
Executive SummaryNVEWS – a National Volcano Early Warning System – is being formulated by the Consortium of U.S. Volcano Observatories (CUSVO) to establish a proactive, fully integrated, national-scale monitoring effort that ensures the most threatening volcanoes in the United States are properly monitored in advance of the onset of unrest and at levels commensurate with the threats posed. Volcani
Authors
John W. Ewert, Marianne Guffanti, Thomas L. Murray
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.