Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of September 2019.
Michael Poland
Mike Poland is a research geophysicist with the Cascades Volcano Observatory and the current Scientist-in-Charge of the Yellowstone Volcano Observatory.
Mike's area of specialization is volcano geodesy, which emphasizes the surface deformation and gravity fields associated with volcanic activity. This work involves the use of space-based technologies, like Interferometric Synthetic Aperture Radar (InSAR), as well as ground-based techniques, like microgravity surveys. Mike has taken part in studies on a variety of volcanic systems in the United States, including Mount St. Helens and other volcanoes of the Pacific Northwest, Kilauea and Mauna Loa volcanoes in Hawaii, and the Yellowstone caldera. His recent work has focused on using gravity change over time to understand the character of the fluids that drive volcanic unrest, and also on the potential of satellite data to improve forecasts of future changes in volcanic activity.
Professional Experience
U.S. Geological Survey - Yellowstone Volcano Observatory: Scientist-in-Charge (2017 - present)
U.S. Geological Survey – Cascades Volcano Observatory: Research Geophysicist (2015 - present)
U.S. Geological Survey – Hawaiian Volcano Observatory: Research Geophysicist (2005 - 2015)
U.S. Geological Survey – Cascades Volcano Observatory: Research Geophysicist (2002 - 2005)
Department of Geology, Clark College (Vancouver, Washington): Instructor (2004)
Arizona State University, Department of Geological Sciences: Graduate Teaching/Research Assoc. (1997 - 2001)
Education and Certifications
Arizona State University: Ph.D. (2001), Geological Sciences
University of California, Davis: B.S. (1997), Geology
Affiliations and Memberships*
American Geophysical Union (AGU)
Geological Society of America (GSA)
International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI)
Honors and Awards
Fellow, Geological Society of America, 2021
Science and Products
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of September 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of August 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of August 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of July 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of July 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of June, 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of June, 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of May, 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of May, 2019.
Time series of vertical displacements during April–October 2017 at four GPS stations on the north side of Yellowstone Lake
linkTime series of vertical displacements during April–October 2017 at four GPS stations (LAK1, LAK2, LKWY, and SEDG) on the north side of Yellowstone Lake. Downward trends indicate subsidence and upward trends show uplift. Uplift “spikes” in late September are related to inclement weather and do not show true deformation. Error bars are one standard deviation.
Time series of vertical displacements during April–October 2017 at four GPS stations on the north side of Yellowstone Lake
linkTime series of vertical displacements during April–October 2017 at four GPS stations (LAK1, LAK2, LKWY, and SEDG) on the north side of Yellowstone Lake. Downward trends indicate subsidence and upward trends show uplift. Uplift “spikes” in late September are related to inclement weather and do not show true deformation. Error bars are one standard deviation.
Horizontal displacements from campaign (black vectors) and continuous (red vectors, with station names given) GPS stations, as well as vertical displacements (indicated by color of GPS station symbol) near South Sister, Oregon. Length of arrow gives amount of horizontal displacement, with scale in lower left showing an arrow length
Horizontal displacements from campaign (black vectors) and continuous (red vectors, with station names given) GPS stations, as well as vertical displacements (indicated by color of GPS station symbol) near South Sister, Oregon. Length of arrow gives amount of horizontal displacement, with scale in lower left showing an arrow length
InSAR image Kīlauea, Hawai‘i, Mar. 2011. Kamoamoa fissure trace is indicated by the red line.
InSAR image Kīlauea, Hawai‘i, Mar. 2011. Kamoamoa fissure trace is indicated by the red line.
Map of Kīlauea Volcano showing the south-southeast motion, as recorded by continuous GPS sites (arrows), and earthquake epicenter between February 1-3, 2010.
Map of Kīlauea Volcano showing the south-southeast motion, as recorded by continuous GPS sites (arrows), and earthquake epicenter between February 1-3, 2010.
Lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, enters the ocean on the south flank of Kīlauea Volcano.
Lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, enters the ocean on the south flank of Kīlauea Volcano.
Yellow-bellied Marmot stands on its hind legs in Yellowstone National Park. Photo by D. Dzurisin.
Yellow-bellied Marmot stands on its hind legs in Yellowstone National Park. Photo by D. Dzurisin.
The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'ithe most active volcano in the world. The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.
The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'ithe most active volcano in the world. The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.
The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'i—the most active volcano in the world. The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.
The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'i—the most active volcano in the world. The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.
When lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, meets the ocean, large littoral explosions can result.
When lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, meets the ocean, large littoral explosions can result.
South side of Mount St. Helens lava dome, glacier (cracked snowy surface in foreground at base of dome) is being uplifted due to increase in activity. October 2, 2005
South side of Mount St. Helens lava dome, glacier (cracked snowy surface in foreground at base of dome) is being uplifted due to increase in activity. October 2, 2005
Criteria for estimation of the Volcanic Explosivity Index (VEI). Modified from: Newhall, C.G., and Self, S., 1982, The volcanic explosivity index (VEI): An estimate of explosive magnitude for historical volcanism. Journal of Geophysical Research, v. 87, no. C2, p.
Criteria for estimation of the Volcanic Explosivity Index (VEI). Modified from: Newhall, C.G., and Self, S., 1982, The volcanic explosivity index (VEI): An estimate of explosive magnitude for historical volcanism. Journal of Geophysical Research, v. 87, no. C2, p.
Geological map of Yellowstone National Park based on work by William Henry Holmes in 1878 as part of Ferdinand Vandeveer Hayden’s United States Geological and Geographical Survey of the Territories, with topography mapped by Henry Gannett and triangulation by Allen David Wilson. From the Twelfth Annual Re
Geological map of Yellowstone National Park based on work by William Henry Holmes in 1878 as part of Ferdinand Vandeveer Hayden’s United States Geological and Geographical Survey of the Territories, with topography mapped by Henry Gannett and triangulation by Allen David Wilson. From the Twelfth Annual Re
The 2014 annual report for the Hawaiian Volcano Observatory
Bayesian estimation of magma supply, storage, and eruption rates using a multiphysical volcano model: Kīlauea Volcano, 2000–2012
Post-eruptive inflation of Okmok Volcano, Alaska, from InSAR, 2008–2014
Dome growth at Mount Cleveland, Aleutian Arc, quantified by time-series TerraSAR-X imagery
The 2014-2015 Pāhoa lava flow crisis at Kīlauea Volcano, Hawai‘i: Disaster avoided and lessons learned
Lava lake level as a gauge of magma reservoir pressure and eruptive hazard
Volcano monitoring from space
Measurement of slow-moving along-track displacement from an efficient multiple-aperture SAR interferometry (MAI) stacking
Hawaiian volcanoes: From source to surface
Using near-real-time monitoring data from Pu'u 'Ō'ō vent at Kīlauea Volcano for training and educational purposes
Delicate balance of magmatic-tectonic interaction at Kilauea Volcano, Hawai`i, revealed from slow slip events: Chapter 13
Hawaiian fissure fountains: Quantifying vent and shallow conduit geometry, episode 1 of the 1969-1974 Mauna Ulu eruption
Science and Products
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Filter Total Items: 101Yellowstone Volcano Observatory Monthly Update: October 1, 2019Yellowstone Volcano Observatory Monthly Update: October 1, 2019Yellowstone Volcano Observatory Monthly Update: October 1, 2019
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of September 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of September 2019.
Yellowstone Volcano Observatory Monthly Update: September 3, 2019Yellowstone Volcano Observatory Monthly Update: September 3, 2019Yellowstone Volcano Observatory Monthly Update: September 3, 2019Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of August 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of August 2019.
Yellowstone Volcano Observatory Monthly Update: August 1, 2019Yellowstone Volcano Observatory Monthly Update: August 1, 2019Yellowstone Volcano Observatory Monthly Update: August 1, 2019Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of July 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of July 2019.
Yellowstone Volcano Observatory Monthly Update: July 1, 2019Yellowstone Volcano Observatory Monthly Update: July 1, 2019Yellowstone Volcano Observatory Monthly Update: July 1, 2019Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of June, 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of June, 2019.
Yellowstone Volcano Observatory Monthly Update: June 3, 2019Yellowstone Volcano Observatory Monthly Update: June 3, 2019Yellowstone Volcano Observatory Monthly Update: June 3, 2019Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of May, 2019.
Mike Poland, Scientist-in-Charge of the Yellowstone Volcano Observatory, describes activity at Yellowstone during the month of May, 2019.
Time series of vertical displacements during April–October 2017 at four GPS stations on the north side of Yellowstone LakeTime series of vertical displacements during April–October 2017 at four GPS stations on the north side of Yellowstone LakeTime series of vertical displacements during April–October 2017 at four GPS stations on the north side of Yellowstone Lake
linkTime series of vertical displacements during April–October 2017 at four GPS stations (LAK1, LAK2, LKWY, and SEDG) on the north side of Yellowstone Lake. Downward trends indicate subsidence and upward trends show uplift. Uplift “spikes” in late September are related to inclement weather and do not show true deformation. Error bars are one standard deviation.
Time series of vertical displacements during April–October 2017 at four GPS stations on the north side of Yellowstone Lake
linkTime series of vertical displacements during April–October 2017 at four GPS stations (LAK1, LAK2, LKWY, and SEDG) on the north side of Yellowstone Lake. Downward trends indicate subsidence and upward trends show uplift. Uplift “spikes” in late September are related to inclement weather and do not show true deformation. Error bars are one standard deviation.
Deformation near South Sister from GPS data, 2001-2017Deformation near South Sister from GPS data, 2001-2017Horizontal displacements from campaign (black vectors) and continuous (red vectors, with station names given) GPS stations, as well as vertical displacements (indicated by color of GPS station symbol) near South Sister, Oregon. Length of arrow gives amount of horizontal displacement, with scale in lower left showing an arrow length
Horizontal displacements from campaign (black vectors) and continuous (red vectors, with station names given) GPS stations, as well as vertical displacements (indicated by color of GPS station symbol) near South Sister, Oregon. Length of arrow gives amount of horizontal displacement, with scale in lower left showing an arrow length
InSAR image Kīlauea, Hawai‘i, Mar. 2011 shows ground surface deflat...InSAR image Kīlauea, Hawai‘i, Mar. 2011 shows ground surface deflat...InSAR image Kīlauea, Hawai‘i, Mar. 2011. Kamoamoa fissure trace is indicated by the red line.
InSAR image Kīlauea, Hawai‘i, Mar. 2011. Kamoamoa fissure trace is indicated by the red line.
Map of Kīlauea showing the south-SE motion, as recorded by continuo...Map of Kīlauea showing the south-SE motion, as recorded by continuo...Map of Kīlauea Volcano showing the south-southeast motion, as recorded by continuous GPS sites (arrows), and earthquake epicenter between February 1-3, 2010.
Map of Kīlauea Volcano showing the south-southeast motion, as recorded by continuous GPS sites (arrows), and earthquake epicenter between February 1-3, 2010.
Lava Enters The Ocean At Kilauea Volcano, Hawai'iLava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, enters the ocean on the south flank of Kīlauea Volcano.
Lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, enters the ocean on the south flank of Kīlauea Volcano.
An inquisitive Yellow-bellied Marmot stands on its hind legs, in Yellowstone National Park.An inquisitive Yellow-bellied Marmot stands on its hind legs, in Yellowstone National Park.Yellow-bellied Marmot stands on its hind legs in Yellowstone National Park. Photo by D. Dzurisin.
Yellow-bellied Marmot stands on its hind legs in Yellowstone National Park. Photo by D. Dzurisin.
The USGS Hawaiian Volcano Observatory Monitors Kilauea's Summit EruptionThe USGS Hawaiian Volcano Observatory Monitors Kilauea's Summit EruptionThe USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'ithe most active volcano in the world. The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.
The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'ithe most active volcano in the world. The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.
USGS Hawaiian Volcano Observatory Monitors Kilauea's Summit EruptionUSGS Hawaiian Volcano Observatory Monitors Kilauea's Summit EruptionThe USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'i—the most active volcano in the world. The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.
The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'i—the most active volcano in the world. The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.
Littoral Explosion At Kilauea Volcano, Hawai'iWhen lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, meets the ocean, large littoral explosions can result.
When lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, meets the ocean, large littoral explosions can result.
South side of Mount St. Helens lava dome, glacierSouth side of Mount St. Helens lava dome, glacier (cracked snowy surface in foreground at base of dome) is being uplifted due to increase in activity. October 2, 2005
South side of Mount St. Helens lava dome, glacier (cracked snowy surface in foreground at base of dome) is being uplifted due to increase in activity. October 2, 2005
Criteria for estimation of the Volcanic Explosivity Index (VEI)Criteria for estimation of the Volcanic Explosivity Index (VEI)Criteria for estimation of the Volcanic Explosivity Index (VEI). Modified from: Newhall, C.G., and Self, S., 1982, The volcanic explosivity index (VEI): An estimate of explosive magnitude for historical volcanism. Journal of Geophysical Research, v. 87, no. C2, p.
Criteria for estimation of the Volcanic Explosivity Index (VEI). Modified from: Newhall, C.G., and Self, S., 1982, The volcanic explosivity index (VEI): An estimate of explosive magnitude for historical volcanism. Journal of Geophysical Research, v. 87, no. C2, p.
Geological map of Yellowstone National Park based on work by William Henry Holmes in 1878Geological map of Yellowstone National Park based on work by William Henry Holmes in 1878Geological map of Yellowstone National Park based on work by William Henry Holmes in 1878 as part of Ferdinand Vandeveer Hayden’s United States Geological and Geographical Survey of the Territories, with topography mapped by Henry Gannett and triangulation by Allen David Wilson. From the Twelfth Annual Re
Geological map of Yellowstone National Park based on work by William Henry Holmes in 1878 as part of Ferdinand Vandeveer Hayden’s United States Geological and Geographical Survey of the Territories, with topography mapped by Henry Gannett and triangulation by Allen David Wilson. From the Twelfth Annual Re
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The 2014 annual report for the Hawaiian Volcano Observatory
Introduction This report summarizes team activities and findings of the Hawaiian Volcano Observatory during the year 2014 in geology, geodesy, seismicity, and gas geochemistry. The eruption of Pu‘u ‘Ō‘ō continued into its 32nd year with flows active to the northeast of the vent. One of them, the June 27th lava flow, named for the date in 2014 that the flow started, advanced far and fast enough toAuthorsJames P. Kauahikaua, Tim R. Orr, Matt Patrick, Weston A. Thelen, Matthew K. Burgess, Asta Miklius, Michael P. Poland, Kyle R. Anderson, Loren Antolik, Tamar Elias, Jeff Sutton, Christoph Kern, Cindy WernerBayesian estimation of magma supply, storage, and eruption rates using a multiphysical volcano model: Kīlauea Volcano, 2000–2012
Estimating rates of magma supply to the world's volcanoes remains one of the most fundamental aims of volcanology. Yet, supply rates can be difficult to estimate even at well-monitored volcanoes, in part because observations are noisy and are usually considered independently rather than as part of a holistic system. In this work we demonstrate a technique for probabilistically estimating time-variAuthorsKyle R. Anderson, Michael P. PolandPost-eruptive inflation of Okmok Volcano, Alaska, from InSAR, 2008–2014
Okmok, a ~10-km wide caldera that occupies most of the northeastern end of Umnak Island, is one of the most active volcanoes in the Aleutian arc. The most recent eruption at Okmok during July-August 2008 was by far its largest and most explosive since at least the early 19th century. We investigate post-eruptive magma supply and storage at the volcano during 2008–2014 by analyzing all available syAuthorsFeifei Qu, Zhong Lu, Michael P. Poland, Jeffrey T. Freymueller, Qin Zhang, Hyung-Sup JungDome growth at Mount Cleveland, Aleutian Arc, quantified by time-series TerraSAR-X imagery
Synthetic aperture radar imagery is widely used to study surface deformation induced by volcanic activity; however, it is rarely applied to quantify the evolution of lava domes, which is important for understanding hazards and magmatic system characteristics. We studied dome formation associated with eruptive activity at Mount Cleveland, Aleutian Volcanic Arc, in 2011–2012 using TerraSAR-X imageryAuthorsTeng Wang, Michael P. Poland, Zhong LuThe 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 Volcano in thAuthorsMichael P. Poland, Tim R. Orr, James P. Kauahikaua, Steven R. Brantley, Janet L. Babb, Matthew R. Patrick, Christina A. Neal, Kyle R. Anderson, Loren Antolik, Matthew K. Burgess, Tamar Elias, Steven Fuke, Pauline Fukunaga, Ingrid A. Johanson, Marian Kagimoto, Kevan P. Kamibayashi, Lopaka Lee, Asta Miklius, William Million, Cyril J. Moniz, Paul G. Okubo, Andrew Sutton, T. Jane Takahashi, Weston A. Thelen, Willam Tollett, Frank A. TrusdellLava lake level as a gauge of magma reservoir pressure and eruptive hazard
Forecasting volcanic activity relies fundamentally on tracking magma pressure through the use of proxies, such as ground surface deformation and earthquake rates. Lava lakes at open-vent basaltic volcanoes provide a window into the uppermost magma system for gauging reservoir pressure changes more directly. At Kīlauea Volcano (Hawaiʻi, USA) the surface height of the summit lava lake in HalemaʻumaʻAuthorsMatthew R. Patrick, Kyle R. Anderson, Michael P. Poland, Tim R. Orr, Donald A. SwansonVolcano monitoring from space
Unlike many natural hazards, volcanoes usually give warnings of impending eruptions that can be detected from hours to years prior to any hazardous activity [Sparks et al., 2012]. The Eyjafjallajökull eruption, for example, was preceded by several discrete episodes of subsurface magma accumulation that highlighted the potential for future eruption. Once it begins, an eruption can last for up toAuthorsMichael P. PolandMeasurement of slow-moving along-track displacement from an efficient multiple-aperture SAR interferometry (MAI) stacking
Multiple-aperture SAR interferometry (MAI) has demonstrated outstanding measurement accuracy of along-track displacement when compared to pixel-offset-tracking methods; however, measuring slow-moving (cm/year) surface displacement remains a challenge. Stacking of multi-temporal observations is a potential approach to reducing noise and increasing measurement accuracy, but it is difficult to achievAuthorsMin-Jeong Jo, Hyung-Sup Jung, Joong-Sun Won, Michael P. Poland, Asta Miklius, Zhong LuHawaiian volcanoes: From source to surface
Hawaiian Volcanoes, From Source to Surface is the outcome of an AGU Chapman Conference held on the Island of Hawaii in August 2012. As such, this monograph contains a diversity of research results that highlight the current understanding of how Hawaiian volcanoes work and point out fundamental questions requiring additional exploration.Using near-real-time monitoring data from Pu'u 'Ō'ō vent at Kīlauea Volcano for training and educational purposes
Training non-scientists in the use of volcano-monitoring data is critical preparation in advance of a volcanic crisis, but it is currently unclear which methods are most effective for improving the content-knowledge of non-scientists to help bridge communications between volcano experts and non-experts. We measured knowledge gains for beginning-(introductory-level students) and novice-level learneAuthorsRachel Teasdale, Katrien van der Hoeven Kraft, Michael P. PolandDelicate balance of magmatic-tectonic interaction at Kilauea Volcano, Hawai`i, revealed from slow slip events: Chapter 13
Eleven slow slip events (SSEs) have occurred on the southern flank of Kilauea Volcano, Hawai’i, since 1997 through 2014. We analyze this series of SSEs in the context of Kilauea’s magma system to assess whether or not there are interactions between these tectonic events and eruptive/intrusive activity. Over time, SSEs have increased in magnitude and become more regular, with interevent times averaAuthorsEmily Montgomery-Brown, Michael P. Poland, Asta MikliusHawaiian fissure fountains: Quantifying vent and shallow conduit geometry, episode 1 of the 1969-1974 Mauna Ulu eruption
Geometries of shallow magmatic pathways feeding volcanic eruptions are poorly constrained, yet many key interpretations about eruption dynamics depend on knowledge of these geometries. Direct quantification is difficult because vents typically become blocked with lava at the end of eruptions. Indirect geophysical techniques have shed light on some volcanic conduit geometries, but the scales are toAuthorsCarolyn Parcheta, Sarah Fagents, Donald A. Swanson, Bruce F. Houghton, Todd Ericksen - News
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*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