Christina A. Neal (Former Employee)
Science and Products
Filter Total Items: 96
Postglacial eruptive history and geochemistry of Semisopochnoi volcano, western Aleutian Islands, Alaska Postglacial eruptive history and geochemistry of Semisopochnoi volcano, western Aleutian Islands, Alaska
Semisopochnoi Island, located in the Rat Islands group of the western Aleutian Islands and Aleutian volcanic arc, is a roughly circular island composed of scattered volcanic vents, the prominent caldera of Semisopochnoi volcano, and older, ancestral volcanic rocks. The oldest rocks on the island are gently radially dipping lavas that are the remnants of a shield volcano and of Ragged Top...
Authors
Michelle Coombs, Jessica Larsen, Christina Neal
Volcanic unrest at Mauna Loa, Earth's largest active volcano Volcanic unrest at Mauna Loa, Earth's largest active volcano
Mauna Loa is showing persistent signs of volcanic unrest. Since 2014, increased seismicity and deformation indicate that Mauna Loa, the volcano that dominates more than half of the island of Hawaiʻi, may be building toward its first eruption since 1984. Thousands of residents and key infrastructure are potentially at risk from lava flows, so a critical question is whether the volcano...
Authors
Weston Thelen, Asta Mikijus, Christina Neal
Kīlauea summit eruption—Lava returns to Halemaʻumaʻu Kīlauea summit eruption—Lava returns to Halemaʻumaʻu
In March 2008, a new volcanic vent opened within Halemaʻumaʻu, a crater at the summit of Kīlauea Volcano in Hawaiʻi Volcanoes National Park on the Island of Hawaiʻi. This new vent is one of two ongoing eruptions on the volcano. The other is on Kīlauea’s East Rift Zone, where vents have been erupting nearly nonstop since 1983. The duration of these simultaneous summit and rift zone...
Authors
Janet Babb, Stephen Wessells, Christina Neal
2014 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory 2014 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, volcanic unrest or suspected unrest, and seismic events at 18 volcanic centers in Alaska during 2014. The most notable volcanic activity consisted of intermittent ash eruptions from long-active Cleveland and Shishaldin Volcanoes in the Aleutian Islands, and two eruptive episodes at Pavlof Volcano on the...
Authors
Cheryl E. Cameron, James Dixon, Christina Neal, Christopher Waythomas, Janet Schaefer, Robert McGimsey
The 2014-2015 Pāhoa lava flow crisis at Kīlauea Volcano, Hawai‘i: Disaster avoided and lessons learned The 2014-2015 Pāhoa lava flow crisis at Kīlauea Volcano, Hawai‘i: Disaster avoided and lessons learned
Lava flow crises are nothing new on the Island of Hawai‘i, where their destructive force has been demonstrated repeatedly over the past several hundred years. The 2014–2015 Pāhoa lava flow crisis, however, was unique in terms of its societal impact and volcanological characteristics. Despite low effusion rates, a long-lived lava flow whose extent reached 20 km (the longest at Kīlauea...
Authors
Michael Poland, Tim Orr, James Kauahikaua, Steven R. Brantley, Janet Babb, Matthew Patrick, Christina Neal, Kyle Anderson, Loren Antolik, Matthew Burgess, Tamar Elias, Steven Fuke, Pauline Fukunaga, Ingrid Johanson, Marian Kagimoto, Kevan Kamibayashi, Lopaka Lee, Asta Miklius, William Million, Cyril Moniz, Paul Okubo, Andrew Sutton, T. Jane Takahashi, Weston Thelen, Willam Tollett, Frank A. Trusdell
At the foot of the smoking mountains: The 2014 scientific investigations in the Islands of the Four Mountains At the foot of the smoking mountains: The 2014 scientific investigations in the Islands of the Four Mountains
An interdisciplinary research team conducted archaeological, geological, and biological investigations in the Islands of the Four Mountains, Alaska during the summer of 2014 as part of a three-year project to study long-term geological and ecological patterns and processes with respect to human settlement. Researchers investigated three archaeological sites on Chuginadak Island (SAM-0014...
Authors
Virginia Hatfield, Kale Bruner, Dixie West, Arkady Savinetsky, Olga Krylovich, Bulat Khasanov, Dmitry Vasyukov, Zhanna Antipushina, Mitsuru Okuno, Susan Crockford, Kirsten Nicolaysen, Breanyn MacInnes, Lyman Persico, Pavel Izbekov, Christina Neal, Thomas Bartlett, Lydia Loopesko, Anne Fulton
Water-magma interaction and plume processes in the 2008 Okmok eruption, Alaska Water-magma interaction and plume processes in the 2008 Okmok eruption, Alaska
Eruptions of similar explosivity can have divergent effects on the surroundings due to differences in the behavior of the tephra in the eruption column and atmosphere. Okmok volcano, located on Umnak Island in the eastern Aleutian Islands, erupted explosively between 12 July and 19 August 2008. The basaltic andesitic eruption ejected ∼0.24 km3dense rock equivalent (DRE) of tephra...
Authors
Joel Unema, Michael Ort, Jessica Larsen, Christina Neal, Janet Schaefer
Aniakchak National Monument and Preserve: Geologic resources inventory report Aniakchak National Monument and Preserve: Geologic resources inventory report
This GRI report is a companion document to previously completed GRI digital geologic map data. It was written for resource managers to support science-informed decision making. It may also be useful for interpretation. The report was prepared using available geologic information, and the NPS Geologic Resources Division conducted no new fieldwork in association with its preparation...
Authors
Chad Hults, Christina Neal
2013 volcanic activity in Alaska: summary of events and response of the Alaska Volcano Observatory 2013 volcanic activity in Alaska: summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, volcanic unrest or suspected unrest, and seismic events at 18 volcanic centers in Alaska during 2013. Beginning with the 2013 AVO Summary of Events, the annual description of the AVO seismograph network and activity, once a stand-alone publication, is now part of this report. Because of this change, the annual summary now...
Authors
James Dixon, Cheryl Cameron, Robert McGimsey, Christina Neal, Chris Waythomas
The 2008 phreatomagmatic eruption of Okmok volcano, Aleutian Islands, Alaska: Chronology, deposits, and landform changes The 2008 phreatomagmatic eruption of Okmok volcano, Aleutian Islands, Alaska: Chronology, deposits, and landform changes
Okmok volcano, Aleutian Islands, Alaska, explosively erupted over a five-week period between July 12 and August 23, 2008. The eruption was predominantly phreatomagmatic, producing fine-grained tephra that covered most of northeastern Umnak Island. The eruption had a maximum Volcanic Explosivity Index (VEI) of 4, with eruption column heights up to 16 km during the opening phase. Several...
Authors
Jessica Larsen, Christina Neal, Janet Schaefer, Max Kaufman, Zhong Lu
Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak volcano, Alaska Peninsula Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak volcano, Alaska Peninsula
Aniakchak is a Pleistocene to Holocene composite volcano of the Alaska–Aleutian arc that suffered at least one caldera-forming eruption in postglacial time and last erupted in 1931. The oldest recognized postglacial eruption, Aniakchak I, produced andesite ignimbrite ca. 9,500–7,500 14C yr B.P. Subsequently, a vent northeast of the summit issued dacite–rhyodacite magma ca. 7,000 14C yr B...
Authors
Charles Bacon, Christina Neal, Thomas Miller, Robert McGimsey, Christopher Nye
2012 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory 2012 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, volcanic unrest, or suspected unrest at 11 volcanic centers in Alaska during 2012. Of the two verified eruptions, one (Cleveland) was clearly magmatic and the other (Kanaga) was most likely a single phreatic explosion. Two other volcanoes had notable seismic swarms that probably were caused by magmatic...
Authors
Julie Herrick, Christina A. Neal, Cheryl E. Cameron, James Dixon, Robert McGimsey
Filter Total Items: 61
Science and Products
Filter Total Items: 96
Postglacial eruptive history and geochemistry of Semisopochnoi volcano, western Aleutian Islands, Alaska Postglacial eruptive history and geochemistry of Semisopochnoi volcano, western Aleutian Islands, Alaska
Semisopochnoi Island, located in the Rat Islands group of the western Aleutian Islands and Aleutian volcanic arc, is a roughly circular island composed of scattered volcanic vents, the prominent caldera of Semisopochnoi volcano, and older, ancestral volcanic rocks. The oldest rocks on the island are gently radially dipping lavas that are the remnants of a shield volcano and of Ragged Top...
Authors
Michelle Coombs, Jessica Larsen, Christina Neal
Volcanic unrest at Mauna Loa, Earth's largest active volcano Volcanic unrest at Mauna Loa, Earth's largest active volcano
Mauna Loa is showing persistent signs of volcanic unrest. Since 2014, increased seismicity and deformation indicate that Mauna Loa, the volcano that dominates more than half of the island of Hawaiʻi, may be building toward its first eruption since 1984. Thousands of residents and key infrastructure are potentially at risk from lava flows, so a critical question is whether the volcano...
Authors
Weston Thelen, Asta Mikijus, Christina Neal
Kīlauea summit eruption—Lava returns to Halemaʻumaʻu Kīlauea summit eruption—Lava returns to Halemaʻumaʻu
In March 2008, a new volcanic vent opened within Halemaʻumaʻu, a crater at the summit of Kīlauea Volcano in Hawaiʻi Volcanoes National Park on the Island of Hawaiʻi. This new vent is one of two ongoing eruptions on the volcano. The other is on Kīlauea’s East Rift Zone, where vents have been erupting nearly nonstop since 1983. The duration of these simultaneous summit and rift zone...
Authors
Janet Babb, Stephen Wessells, Christina Neal
2014 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory 2014 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, volcanic unrest or suspected unrest, and seismic events at 18 volcanic centers in Alaska during 2014. The most notable volcanic activity consisted of intermittent ash eruptions from long-active Cleveland and Shishaldin Volcanoes in the Aleutian Islands, and two eruptive episodes at Pavlof Volcano on the...
Authors
Cheryl E. Cameron, James Dixon, Christina Neal, Christopher Waythomas, Janet Schaefer, Robert McGimsey
The 2014-2015 Pāhoa lava flow crisis at Kīlauea Volcano, Hawai‘i: Disaster avoided and lessons learned The 2014-2015 Pāhoa lava flow crisis at Kīlauea Volcano, Hawai‘i: Disaster avoided and lessons learned
Lava flow crises are nothing new on the Island of Hawai‘i, where their destructive force has been demonstrated repeatedly over the past several hundred years. The 2014–2015 Pāhoa lava flow crisis, however, was unique in terms of its societal impact and volcanological characteristics. Despite low effusion rates, a long-lived lava flow whose extent reached 20 km (the longest at Kīlauea...
Authors
Michael Poland, Tim Orr, James Kauahikaua, Steven R. Brantley, Janet Babb, Matthew Patrick, Christina Neal, Kyle Anderson, Loren Antolik, Matthew Burgess, Tamar Elias, Steven Fuke, Pauline Fukunaga, Ingrid Johanson, Marian Kagimoto, Kevan Kamibayashi, Lopaka Lee, Asta Miklius, William Million, Cyril Moniz, Paul Okubo, Andrew Sutton, T. Jane Takahashi, Weston Thelen, Willam Tollett, Frank A. Trusdell
At the foot of the smoking mountains: The 2014 scientific investigations in the Islands of the Four Mountains At the foot of the smoking mountains: The 2014 scientific investigations in the Islands of the Four Mountains
An interdisciplinary research team conducted archaeological, geological, and biological investigations in the Islands of the Four Mountains, Alaska during the summer of 2014 as part of a three-year project to study long-term geological and ecological patterns and processes with respect to human settlement. Researchers investigated three archaeological sites on Chuginadak Island (SAM-0014...
Authors
Virginia Hatfield, Kale Bruner, Dixie West, Arkady Savinetsky, Olga Krylovich, Bulat Khasanov, Dmitry Vasyukov, Zhanna Antipushina, Mitsuru Okuno, Susan Crockford, Kirsten Nicolaysen, Breanyn MacInnes, Lyman Persico, Pavel Izbekov, Christina Neal, Thomas Bartlett, Lydia Loopesko, Anne Fulton
Water-magma interaction and plume processes in the 2008 Okmok eruption, Alaska Water-magma interaction and plume processes in the 2008 Okmok eruption, Alaska
Eruptions of similar explosivity can have divergent effects on the surroundings due to differences in the behavior of the tephra in the eruption column and atmosphere. Okmok volcano, located on Umnak Island in the eastern Aleutian Islands, erupted explosively between 12 July and 19 August 2008. The basaltic andesitic eruption ejected ∼0.24 km3dense rock equivalent (DRE) of tephra...
Authors
Joel Unema, Michael Ort, Jessica Larsen, Christina Neal, Janet Schaefer
Aniakchak National Monument and Preserve: Geologic resources inventory report Aniakchak National Monument and Preserve: Geologic resources inventory report
This GRI report is a companion document to previously completed GRI digital geologic map data. It was written for resource managers to support science-informed decision making. It may also be useful for interpretation. The report was prepared using available geologic information, and the NPS Geologic Resources Division conducted no new fieldwork in association with its preparation...
Authors
Chad Hults, Christina Neal
2013 volcanic activity in Alaska: summary of events and response of the Alaska Volcano Observatory 2013 volcanic activity in Alaska: summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, volcanic unrest or suspected unrest, and seismic events at 18 volcanic centers in Alaska during 2013. Beginning with the 2013 AVO Summary of Events, the annual description of the AVO seismograph network and activity, once a stand-alone publication, is now part of this report. Because of this change, the annual summary now...
Authors
James Dixon, Cheryl Cameron, Robert McGimsey, Christina Neal, Chris Waythomas
The 2008 phreatomagmatic eruption of Okmok volcano, Aleutian Islands, Alaska: Chronology, deposits, and landform changes The 2008 phreatomagmatic eruption of Okmok volcano, Aleutian Islands, Alaska: Chronology, deposits, and landform changes
Okmok volcano, Aleutian Islands, Alaska, explosively erupted over a five-week period between July 12 and August 23, 2008. The eruption was predominantly phreatomagmatic, producing fine-grained tephra that covered most of northeastern Umnak Island. The eruption had a maximum Volcanic Explosivity Index (VEI) of 4, with eruption column heights up to 16 km during the opening phase. Several...
Authors
Jessica Larsen, Christina Neal, Janet Schaefer, Max Kaufman, Zhong Lu
Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak volcano, Alaska Peninsula Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak volcano, Alaska Peninsula
Aniakchak is a Pleistocene to Holocene composite volcano of the Alaska–Aleutian arc that suffered at least one caldera-forming eruption in postglacial time and last erupted in 1931. The oldest recognized postglacial eruption, Aniakchak I, produced andesite ignimbrite ca. 9,500–7,500 14C yr B.P. Subsequently, a vent northeast of the summit issued dacite–rhyodacite magma ca. 7,000 14C yr B...
Authors
Charles Bacon, Christina Neal, Thomas Miller, Robert McGimsey, Christopher Nye
2012 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory 2012 volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptions, possible eruptions, volcanic unrest, or suspected unrest at 11 volcanic centers in Alaska during 2012. Of the two verified eruptions, one (Cleveland) was clearly magmatic and the other (Kanaga) was most likely a single phreatic explosion. Two other volcanoes had notable seismic swarms that probably were caused by magmatic...
Authors
Julie Herrick, Christina A. Neal, Cheryl E. Cameron, James Dixon, Robert McGimsey
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