Margaret Mangan, PhD (Former Employee)
Science and Products
Filter Total Items: 28
The California Volcano Observatory: Monitoring the state's restless volcanoes The California Volcano Observatory: Monitoring the state's restless volcanoes
Volcanic eruptions happen in the State of California about as frequently as the largest earthquakes on the San Andreas Fault Zone. At least 10 eruptions have taken place in California in the past 1,000 years—most recently at Lassen Peak in Lassen Volcanic National Park (1914 to 1917) in the northern part of the State—and future volcanic eruptions are inevitable. The U.S. Geological...
Authors
Wendy K. Stovall, Mae Marcaida, Margaret T. Mangan
Long Valley Caldera 2003 through 2014: Overview of low level unrest in the past decade Long Valley Caldera 2003 through 2014: Overview of low level unrest in the past decade
Long Valley Caldera is located in California along the eastern escarpment of the Sierra Nevada Range. The caldera formed about 760,000 years ago as the eruption of 600 km3 of rhyolite magma (Bishop Tuff) resulted in collapse of the partially evacuated magma chamber. Resurgent doming in the central part of the caldera occurred shortly afterwards, and the most recent eruptions inside the...
Authors
Stuart K. Wilkinson, David P. Hill, John O. Langbein, Michael Lisowski, Margaret T. Mangan
Magnetic and gravity studies of Mono Lake, east-central, California Magnetic and gravity studies of Mono Lake, east-central, California
From August 26 to September 5, 2011, the U.S. Geological Survey (USGS) collected more than 600 line-kilometers of shipborne magnetic data on Mono Lake, 20 line-kilometers of ground magnetic data on Paoha Island, 50 gravity stations on Paoha and Negit Islands, and 28 rock samples on Paoha and Negit Islands, in east-central California. Magnetic and gravity investigations were undertaken in...
Authors
Noah D. Athens, David A. Ponce, Angela S. Jayko, Matt Miller, Bobby McEvoy, Mae Marcaida, Margaret T. Mangan, Stuart K. Wilkinson, James S. McClain, Bruce A. Chuchel, Kevin M. Denton
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Volcano Hazards Program, Volcano Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Crustal migration of CO2-rich magmatic fluids recorded by tree-ring radiocarbon and seismicity at Mammoth Mountain, CA, USA Crustal migration of CO2-rich magmatic fluids recorded by tree-ring radiocarbon and seismicity at Mammoth Mountain, CA, USA
Unrest at Mammoth Mountain over the past several decades, manifest by seismicity, ground deformation, diffuse CO2 emissions, and elevated 3He/4He ratios in fumarolic gases has been driven by the release of CO2-rich fluids from basaltic intrusions in the middle to lower crust. Recent unrest included the occurrence of three lower-crustal (32–19 km depth) seismic swarms beneath Mammoth...
Authors
Jennifer L. Lewicki, George E. Hilley, David R. Shelly, John C. King, John P. McGeehin, Margaret T. Mangan, William C. Evans
Geochemical fingerprinting of Wilson Creek formation tephra layers (Mono Basin, California) using titanomagnetite compositions Geochemical fingerprinting of Wilson Creek formation tephra layers (Mono Basin, California) using titanomagnetite compositions
Nineteen tephra layers within the Wilson Creek formation near Mono Lake provide a record of late Pleistocene to early Holocene volcanic activity from the nearby Mono Craters and are important chronostratigraphic markers for paleomagnetic, paleoclimatic, and paleoecologic studies. These stratigraphically important tephra deposits can be geochemically identified using compositions of their
Authors
Mae Marcaida, Margaret T. Mangan, Jorge A. Vazquez, Marcus Bursik, Marsha I. Lidzbarski
A century of studying effusive eruptions in Hawaii A century of studying effusive eruptions in Hawaii
The Hawaiian Volcano Observatory (HVO) was established as a natural laboratory to study volcanic processes. Since the most frequent form of volcanic activity in Hawai‘i is effusive, a major contribution of the past century of research at HVO has been to describe and quantify lava flow emplacement processes. Lava flow research has taken many forms; first and foremost it has been a...
Authors
Katherine V. Cashman, Margaret T. Mangan
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: 28
The California Volcano Observatory: Monitoring the state's restless volcanoes The California Volcano Observatory: Monitoring the state's restless volcanoes
Volcanic eruptions happen in the State of California about as frequently as the largest earthquakes on the San Andreas Fault Zone. At least 10 eruptions have taken place in California in the past 1,000 years—most recently at Lassen Peak in Lassen Volcanic National Park (1914 to 1917) in the northern part of the State—and future volcanic eruptions are inevitable. The U.S. Geological...
Authors
Wendy K. Stovall, Mae Marcaida, Margaret T. Mangan
Long Valley Caldera 2003 through 2014: Overview of low level unrest in the past decade Long Valley Caldera 2003 through 2014: Overview of low level unrest in the past decade
Long Valley Caldera is located in California along the eastern escarpment of the Sierra Nevada Range. The caldera formed about 760,000 years ago as the eruption of 600 km3 of rhyolite magma (Bishop Tuff) resulted in collapse of the partially evacuated magma chamber. Resurgent doming in the central part of the caldera occurred shortly afterwards, and the most recent eruptions inside the...
Authors
Stuart K. Wilkinson, David P. Hill, John O. Langbein, Michael Lisowski, Margaret T. Mangan
Magnetic and gravity studies of Mono Lake, east-central, California Magnetic and gravity studies of Mono Lake, east-central, California
From August 26 to September 5, 2011, the U.S. Geological Survey (USGS) collected more than 600 line-kilometers of shipborne magnetic data on Mono Lake, 20 line-kilometers of ground magnetic data on Paoha Island, 50 gravity stations on Paoha and Negit Islands, and 28 rock samples on Paoha and Negit Islands, in east-central California. Magnetic and gravity investigations were undertaken in...
Authors
Noah D. Athens, David A. Ponce, Angela S. Jayko, Matt Miller, Bobby McEvoy, Mae Marcaida, Margaret T. Mangan, Stuart K. Wilkinson, James S. McClain, Bruce A. Chuchel, Kevin M. Denton
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Volcano Hazards Program, Volcano Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Crustal migration of CO2-rich magmatic fluids recorded by tree-ring radiocarbon and seismicity at Mammoth Mountain, CA, USA Crustal migration of CO2-rich magmatic fluids recorded by tree-ring radiocarbon and seismicity at Mammoth Mountain, CA, USA
Unrest at Mammoth Mountain over the past several decades, manifest by seismicity, ground deformation, diffuse CO2 emissions, and elevated 3He/4He ratios in fumarolic gases has been driven by the release of CO2-rich fluids from basaltic intrusions in the middle to lower crust. Recent unrest included the occurrence of three lower-crustal (32–19 km depth) seismic swarms beneath Mammoth...
Authors
Jennifer L. Lewicki, George E. Hilley, David R. Shelly, John C. King, John P. McGeehin, Margaret T. Mangan, William C. Evans
Geochemical fingerprinting of Wilson Creek formation tephra layers (Mono Basin, California) using titanomagnetite compositions Geochemical fingerprinting of Wilson Creek formation tephra layers (Mono Basin, California) using titanomagnetite compositions
Nineteen tephra layers within the Wilson Creek formation near Mono Lake provide a record of late Pleistocene to early Holocene volcanic activity from the nearby Mono Craters and are important chronostratigraphic markers for paleomagnetic, paleoclimatic, and paleoecologic studies. These stratigraphically important tephra deposits can be geochemically identified using compositions of their
Authors
Mae Marcaida, Margaret T. Mangan, Jorge A. Vazquez, Marcus Bursik, Marsha I. Lidzbarski
A century of studying effusive eruptions in Hawaii A century of studying effusive eruptions in Hawaii
The Hawaiian Volcano Observatory (HVO) was established as a natural laboratory to study volcanic processes. Since the most frequent form of volcanic activity in Hawai‘i is effusive, a major contribution of the past century of research at HVO has been to describe and quantify lava flow emplacement processes. Lava flow research has taken many forms; first and foremost it has been a...
Authors
Katherine V. Cashman, Margaret T. Mangan
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.