Christina A. Neal (Former Employee)
Science and Products
Filter Total Items: 96
Volcanic activity in Alaska; summary of events and response of the Alaska Volcano Observatory, 1992 Volcanic activity in Alaska; summary of events and response of the Alaska Volcano Observatory, 1992
No abstract available.
Authors
Robert McGimsey, Christina A. Neal, Michael Doukas
Factors influencing the height of Hawaiian lava fountains: implications for the use of fountain height as an indicator of magma gas content Factors influencing the height of Hawaiian lava fountains: implications for the use of fountain height as an indicator of magma gas content
The heights of lava fountains formed in Hawaiian-style eruptions are controlled by magma gas content, volume flux and the amounts of lava re-entrainment and gas bubble coalescence. Theoretical models of lava fountaining are used to analyse data on lava fountain height variations collected during the 1983–1986 Pu'u 'O'o vent of Kilauea volcano, Hawaii. The results show that the variable...
Authors
E.A. Parfitt, L. Wilson, C.A. Neal
Topographic maps of Novarupta dome and selected portions of the Valley of Ten Thousand Smokes, Katmai National Park and Preserve, Alaska Topographic maps of Novarupta dome and selected portions of the Valley of Ten Thousand Smokes, Katmai National Park and Preserve, Alaska
No abstract available.
Authors
Robert Strobe, William Rice, C.A. Neal
Timelapse film logs from the PuuOo-Kupaianaha eruption of Kilauea Volcano; January 1983 through September 1994 Timelapse film logs from the PuuOo-Kupaianaha eruption of Kilauea Volcano; January 1983 through September 1994
No abstract available.
Authors
Tari Mattox, C. C. Heliker, J.P. Hoffman, Ken Hon, M. Mangan, C.A. Neal, G. E. Ulrich, E.W. Wolfe
Proximal pyroclastic deposits from the 1989-1990 eruption of Redoubt Volcano, Alaska - stratigraphy, distribution, and physical characteristics Proximal pyroclastic deposits from the 1989-1990 eruption of Redoubt Volcano, Alaska - stratigraphy, distribution, and physical characteristics
More than 20 eruptive events during the 1989-1990 eruption of Redoubt Volcano emplaced a complex sequence of lithic pyroclastic-flow, -surge, -fall, ice-diamict, and lahar deposits mainly on the north side of the volcano. The deposits record the changing eruption dynamics from initial gas-rich vent-clearing explosions to episodic gas-poor lava-dome extrusions and failures. The repeated...
Authors
C. Gardner, C.A. Neal, R. B. Waitt, R. Janda
Emission rates of sulfur dioxide and carbon dioxide from Redoubt Volcano, Alaska during the 1989-1990 eruptions Emission rates of sulfur dioxide and carbon dioxide from Redoubt Volcano, Alaska during the 1989-1990 eruptions
Airborne measurements of sulfur dioxide emission rates in the gas plume emitted from fumaroles in the summit crater of Redoubt Volcano were started on March 20, 1990 using the COSPEC method. During the latter half of the period of intermittent dome growth and destruction, between March 20 and mid-June 1990, sulfur dioxide emission rates ranged from approximately 1250 to 5850 t/d, rates...
Authors
T. Casadevall, M.P. Doukas, C.A. Neal, R. McGimsey, C. Gardner
Unusual ice diamicts emplaced during the December 15, 1989 eruption of Redoubt volcano, Alaska Unusual ice diamicts emplaced during the December 15, 1989 eruption of Redoubt volcano, Alaska
Ice diamict comprising clasts of glacier ice and subordinate rock debris in a matrix of ice (snow) grains, coarse ash, and frozen pore water was deposited during the eruption of Redoubt Volcano on December 15, 1989. Rounded clasts of glacier ice and snowpack are as large as 2.5 m, clasts of Redoubt andesite and basement crystalline rocks reach 1 m, and tabular clasts of entrained...
Authors
R. B. Waitt, C. Gardner, T.C. Pierson, J. J. Major, C.A. Neal
What is the Alaska Volcano Observatory? What is the Alaska Volcano Observatory?
Explosive eruptions from Alaska's more than 40 active volcanoes pose a significant and recurring threat to communities, commerce, and aircraft in the north Pacific. The Alaska Volcano Observatory (AVO) was established in 1988 to carry out volcano monitoring, eruption notification, volcanic hazard assessments, and volcano research in Alaska. Effective notifications and advanced warnings...
Authors
Christina Neal, Mike Doukas
Photographs of the 1992 eruptions of Crater Peak, Spurr Volcano, Alaska Photographs of the 1992 eruptions of Crater Peak, Spurr Volcano, Alaska
No abstract available.
Authors
C.A. Neal, R. McGimsey, M.P. Doukas, Inyo Ellersieck
ALVIN investigation of an active propagating rift system, Galapagos 95.5° W ALVIN investigation of an active propagating rift system, Galapagos 95.5° W
ALVIN investigations have defined the fine-scale structural and volcanic patterns produced by active rift and spreading center propagation and failure near 95.5° W on the Galapagos spreading center. Behind the initial lithospheric rifting, which is propagating nearly due west at about 50 km m.y.−1, a triangular block of preexisting lithosphere is being stretched and fractured, with some...
Authors
R.N. Hey, J.M. Sinton, M.C. Kleinrock, R.N. Yonover, K.C. MacDonald, S.P. Miller, R. Searle, D.M. Christie, T.M. Atwater, Norman Sleep, H. Johnson, C.A. Neal
The eruption of Redoubt Volcano, Alaska, December 14, 1989-August 31, 1990 The eruption of Redoubt Volcano, Alaska, December 14, 1989-August 31, 1990
No abstract available.
Authors
Thomas Casadevall, Bernard Chouet, John Davies, Steven Estes, Cynthia Gardner, Richard Hoblitt, John Lahr, Richard Lahusen, Jon Major, Robert McGimsey, Thomas Miller, Thomas L. Murray, Christina Neal, Christopher Nye, Robert Page, Thomas Pierson, John Power, Christopher Stephens, Richard Waitt
Geochemical evidence for invasion of Kilauea's plumbing system by Mauna Loa magma Geochemical evidence for invasion of Kilauea's plumbing system by Mauna Loa magma
From the beginning of the study of Hawaiian volcanism there has been controversy over possible relationships between the neighbouring active volcanoes Mauna Loa and Kilauea1–5. Seismic activity, thought to reflect upward migration of magma, reveals that the magmatic plumbing systems apparently converge at depth to form a broad funnel within the mantle6. Although on rare occasions they...
Authors
J.M. Rhodes, K.P. Wenz, C.A. Neal, J. Sparks, J. Lockwood
Filter Total Items: 61
Science and Products
Filter Total Items: 96
Volcanic activity in Alaska; summary of events and response of the Alaska Volcano Observatory, 1992 Volcanic activity in Alaska; summary of events and response of the Alaska Volcano Observatory, 1992
No abstract available.
Authors
Robert McGimsey, Christina A. Neal, Michael Doukas
Factors influencing the height of Hawaiian lava fountains: implications for the use of fountain height as an indicator of magma gas content Factors influencing the height of Hawaiian lava fountains: implications for the use of fountain height as an indicator of magma gas content
The heights of lava fountains formed in Hawaiian-style eruptions are controlled by magma gas content, volume flux and the amounts of lava re-entrainment and gas bubble coalescence. Theoretical models of lava fountaining are used to analyse data on lava fountain height variations collected during the 1983–1986 Pu'u 'O'o vent of Kilauea volcano, Hawaii. The results show that the variable...
Authors
E.A. Parfitt, L. Wilson, C.A. Neal
Topographic maps of Novarupta dome and selected portions of the Valley of Ten Thousand Smokes, Katmai National Park and Preserve, Alaska Topographic maps of Novarupta dome and selected portions of the Valley of Ten Thousand Smokes, Katmai National Park and Preserve, Alaska
No abstract available.
Authors
Robert Strobe, William Rice, C.A. Neal
Timelapse film logs from the PuuOo-Kupaianaha eruption of Kilauea Volcano; January 1983 through September 1994 Timelapse film logs from the PuuOo-Kupaianaha eruption of Kilauea Volcano; January 1983 through September 1994
No abstract available.
Authors
Tari Mattox, C. C. Heliker, J.P. Hoffman, Ken Hon, M. Mangan, C.A. Neal, G. E. Ulrich, E.W. Wolfe
Proximal pyroclastic deposits from the 1989-1990 eruption of Redoubt Volcano, Alaska - stratigraphy, distribution, and physical characteristics Proximal pyroclastic deposits from the 1989-1990 eruption of Redoubt Volcano, Alaska - stratigraphy, distribution, and physical characteristics
More than 20 eruptive events during the 1989-1990 eruption of Redoubt Volcano emplaced a complex sequence of lithic pyroclastic-flow, -surge, -fall, ice-diamict, and lahar deposits mainly on the north side of the volcano. The deposits record the changing eruption dynamics from initial gas-rich vent-clearing explosions to episodic gas-poor lava-dome extrusions and failures. The repeated...
Authors
C. Gardner, C.A. Neal, R. B. Waitt, R. Janda
Emission rates of sulfur dioxide and carbon dioxide from Redoubt Volcano, Alaska during the 1989-1990 eruptions Emission rates of sulfur dioxide and carbon dioxide from Redoubt Volcano, Alaska during the 1989-1990 eruptions
Airborne measurements of sulfur dioxide emission rates in the gas plume emitted from fumaroles in the summit crater of Redoubt Volcano were started on March 20, 1990 using the COSPEC method. During the latter half of the period of intermittent dome growth and destruction, between March 20 and mid-June 1990, sulfur dioxide emission rates ranged from approximately 1250 to 5850 t/d, rates...
Authors
T. Casadevall, M.P. Doukas, C.A. Neal, R. McGimsey, C. Gardner
Unusual ice diamicts emplaced during the December 15, 1989 eruption of Redoubt volcano, Alaska Unusual ice diamicts emplaced during the December 15, 1989 eruption of Redoubt volcano, Alaska
Ice diamict comprising clasts of glacier ice and subordinate rock debris in a matrix of ice (snow) grains, coarse ash, and frozen pore water was deposited during the eruption of Redoubt Volcano on December 15, 1989. Rounded clasts of glacier ice and snowpack are as large as 2.5 m, clasts of Redoubt andesite and basement crystalline rocks reach 1 m, and tabular clasts of entrained...
Authors
R. B. Waitt, C. Gardner, T.C. Pierson, J. J. Major, C.A. Neal
What is the Alaska Volcano Observatory? What is the Alaska Volcano Observatory?
Explosive eruptions from Alaska's more than 40 active volcanoes pose a significant and recurring threat to communities, commerce, and aircraft in the north Pacific. The Alaska Volcano Observatory (AVO) was established in 1988 to carry out volcano monitoring, eruption notification, volcanic hazard assessments, and volcano research in Alaska. Effective notifications and advanced warnings...
Authors
Christina Neal, Mike Doukas
Photographs of the 1992 eruptions of Crater Peak, Spurr Volcano, Alaska Photographs of the 1992 eruptions of Crater Peak, Spurr Volcano, Alaska
No abstract available.
Authors
C.A. Neal, R. McGimsey, M.P. Doukas, Inyo Ellersieck
ALVIN investigation of an active propagating rift system, Galapagos 95.5° W ALVIN investigation of an active propagating rift system, Galapagos 95.5° W
ALVIN investigations have defined the fine-scale structural and volcanic patterns produced by active rift and spreading center propagation and failure near 95.5° W on the Galapagos spreading center. Behind the initial lithospheric rifting, which is propagating nearly due west at about 50 km m.y.−1, a triangular block of preexisting lithosphere is being stretched and fractured, with some...
Authors
R.N. Hey, J.M. Sinton, M.C. Kleinrock, R.N. Yonover, K.C. MacDonald, S.P. Miller, R. Searle, D.M. Christie, T.M. Atwater, Norman Sleep, H. Johnson, C.A. Neal
The eruption of Redoubt Volcano, Alaska, December 14, 1989-August 31, 1990 The eruption of Redoubt Volcano, Alaska, December 14, 1989-August 31, 1990
No abstract available.
Authors
Thomas Casadevall, Bernard Chouet, John Davies, Steven Estes, Cynthia Gardner, Richard Hoblitt, John Lahr, Richard Lahusen, Jon Major, Robert McGimsey, Thomas Miller, Thomas L. Murray, Christina Neal, Christopher Nye, Robert Page, Thomas Pierson, John Power, Christopher Stephens, Richard Waitt
Geochemical evidence for invasion of Kilauea's plumbing system by Mauna Loa magma Geochemical evidence for invasion of Kilauea's plumbing system by Mauna Loa magma
From the beginning of the study of Hawaiian volcanism there has been controversy over possible relationships between the neighbouring active volcanoes Mauna Loa and Kilauea1–5. Seismic activity, thought to reflect upward migration of magma, reveals that the magmatic plumbing systems apparently converge at depth to form a broad funnel within the mantle6. Although on rare occasions they...
Authors
J.M. Rhodes, K.P. Wenz, C.A. Neal, J. Sparks, J. Lockwood
Filter Total Items: 61
*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