Publications
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Hydroacoustic, seismic, and bathymetric observations of the 2014 submarine eruption at Ahyi Seamount, Mariana Arc
Ahyi seamount, a shallow submarine volcano in the Northern Mariana Islands, began erupting on April 23, 2014. Hydroacoustic eruption signals were observed on the regional Mariana seismic network and on distant hydrophones, and NOAA scuba divers working in the area soon after the eruption began heard and felt underwater explosion sounds. The NOAA crew observed yellow orange bubble mats along the sh
Authors
Gabrielle Tepp, William W. Chadwick, Matthew M. Haney, John J. Lyons, Robert Dziak, Susan Merle, Dave Butterfield, Charles W. Young
Toutle River debris flows initiated by atmospheric rivers: November 2006
In early November, 2006, an atmospheric river brought heavy rainfall and high freezing levels to the Pacific Northwest. Without snowpack to buffer the hydrologic response, the storm caused widespread landslides and debris flows in drainages sourced from every central Cascades volcano. At Mount St. Helens, in southwestern Washington State, intense rainfall in the crater of the volcano caused at lea
Authors
Adam R. Mosbrucker, Kurt R. Spicer, Jon J. Major
Assessing the precision and accuracy of particle-size analysis with a laboratory laser-diffraction analyzer
The purpose of this study is to assess the precision and accuracy of laboratory laser-diffraction particle-size distribution (PSD) analysis in support of an effort to formally adopt the method for routine use in U.S. Geological Survey (USGS) sediment laboratories. USGS sediment laboratories analyze the PSD of sediment in support of a wide variety of sediment-transport and water-quality studies fr
Authors
Katherine K. Norton
Authigenic mineral texture in submarine 1979 basalt drill core, Surtsey volcano, Iceland
Micrometer-scale maps of authigenic microstructures in submarine basaltic tuff specimens from a 1979 Surtsey volcano, Iceland, drill core acquired 15 years after eruptions terminated provide fresh perspectives for deciphering the initial alteration of oceanic basalt in a low temperature hydrothermal system. A novel investigative approach integrates synchrotron source X-ray microdiffraction (µXRD),
Authors
M.D. Jackson, S. Couper, S.V. Stan, M. Ivarsson, M.W. Czabaj, N. Tamura, D. Parkinson, L.M. Miyagi, James G. Moore
The 2017-19 activity at Mount Agung in Bali (Indonesia): Intense unrest, monitoring, crisis response, evacuation, and eruption
After 53 years of quiescence, Mount Agung awoke in August 2017, with intense seismicity, measurable ground deformation, and thermal anomalies in the summit crater. Although the seismic unrest peaked in late September and early October, the volcano did not start erupting until 21 November. The most intense explosive eruptions with accompanying rapid lava effusion occurred between 25 and 29 November
Authors
D.K. Syahbana, K. Kasbani, G. Suantika, O. Prambada, A. Andreas, U. Saing, S. Kunrat, S.L. Andreastuti, S. Martanto, E. Kriswati, Y. Suparman, H. Humaida, Sarah E. Ogburn, Peter J. Kelly, John Wellik, Heather Wright, Jeremy D. Pesicek, Rick Wessels, Christoph Kern, Michael Lisowski, Angela K. Diefenbach, Michael P. Poland, Francois Beauducel, R. Greg Vaughan, John S. Pallister, Jacob B. Lowenstern
Modulation of seismic activity in Kīlauea’s Upper East Rift Zone by summit pressurization
Kīlauea Volcano is underlain by a complex, laterally-extensive magmatic plumbing system. Although in recent decades it has mainly erupted through vents along the middle East Rift Zone and summit caldera, eruptions can occur anywhere along its two laterally extensive rift zones, as demonstrated by the dramatic eruptive activity of 2018. Forecasting eruptive activity requires an understanding of whe
Authors
Christelle Wauthier, Diana C. Roman, Michael P. Poland
Real-time monitoring of debris-flow velocity and mass deformation from field experiments with high sample rate lidar and video
Debris flows evolve in both time and space in complex ways, commonly starting as coherent failures but then quickly developing structures such as roll waves and surges. This process is readily observed, but difficult to study or quantify because of the speed at which it occurs. Many methods for studying debris flows consist of point measurements (e.g., of flow height or basal stresses), which are
Authors
Francis K. Rengers, Thomas Rapstine, Kate E. Allstadt, Michael Olsen, Michael Bunn, Richard M. Iverson, Jason W. Kean, Ben Leshchinsky, Matthew Logan, Mahyar Sharifi-Mood, Maciej Obryk, Joel B. Smith
SUSTAIN drilling at Surtsey volcano, Iceland, tracks hydrothermal and microbiological interactions in basalt 50 years after eruption
The 2017 Surtsey Underwater volcanic System for Thermophiles, Alteration processes and INnovative concretes (SUSTAIN) drilling project at Surtsey volcano, sponsored in part by the International Continental Scientific Drilling Program (ICDP), provides precise observations of the hydrothermal, geochemical, geomagnetic, and microbiological changes that have occurred in basaltic tephra and minor intru
Authors
M.D. Jackson, M.T. Gudmundsson, T.B. Weisenberger, J.M. Rhodes, A. Stefánsson, B. Kleine, P.C. Lippert, J.M. Marquardt, H.I. Reynolds, J. Kück, V.Þ. Marteinsson, P. Vannier, W. Bach, A. Barich, P. Bergsten, J. G. Bryce, P. Cappelletti, S. Couper, M.F. Fahnestock, C. Gorny, C. Grimaldi, M. Groh, Á. Guðmundsson, Á.Þ. Gunnlaugsson, C. Hamlin, Þ. Högnadóttir, K. Jónasson, S.S. Jónsson, S.L. Jørgensen, A. Klonowski, B.V. Marshall, J. McPhie, James G. Moore, E.S. Ólafsson, S.L. Onstag, V. Perez, S. Prause, S.P. Snorasson, A. Türke, J.D.L. White, B. Zimanowski
3D electrical conductivity imaging of Halema‘uma‘u lava lake (Kīlauea volcano)
Before the 2018 collapse of the summit of Kīlauea volcano, a ca. 200 m in diameter lava lake inside of Halema‘uma‘u crater was embedded in a very active hydrothermal system. In 2015, we carried out an electrical conductivity survey and the data were inverted in 3D. The lack of conductivity contrast precludes distinguishing the lava column from the surrounding hydrothermal zones. Laboratory measure
Authors
Lydie Gailler, James P. Kauahikaua, Jean-François Lénat, André Revil, Marceau Gresse, Abdellahi Soueid Ahmed, Nicolas Cluzel, Geeth Manthilake, Lucia Gurioli, Tim B. Johnson, Anthony Finizola, Eric Delcher
Modeling ash dispersal from future eruptions of Taupo supervolcano
Hazard analysis at caldera volcanoes is challenging due to the wide range of eruptive and environmental conditions that can plausibly occur during renewed activity. Taupo volcano, New Zealand, is a frequently active and productive rhyolitic caldera volcano that has hosted the world's youngest known supereruption and numerous smaller explosive events. To assess ashfall hazard from future eruptions,
Authors
Simon J Barker, Alexa R. Van Eaton, Larry G. Mastin, Colin JN Wilson, Mary Anne Thompson, Tom M Wilson, Cory Davis, James A Renwick
Insights into pāhoehoe lava emplacement using visible and thermal structure-from-motion photogrammetry
We present the evolution over 3 months of a 2016–2017 pāhoehoe flow at Kīlauea as it changed from a narrow sheet flow into a compound lava field fed by a stable system of tubes. The portion of the flow located on Kīlauea's coastal plain was characterized using helicopter‐based visible and thermal structure‐from‐motion photogrammetry to construct a series of georeferenced digital surface models and
Authors
Sébastien Biass, Tim R. Orr, Bruce F. Houghton, Matthew R. Patrick, Mike R. James, Nick Turner
Variability in shelf sedimentation in response to fluvial sediment supply and coastal erosion over the past 1,000 years in Monterey Bay, CA, United States
Continental shelf environments are uniquely situated to capture some of the most dynamic processes on Earth including climatic variability and anthropogenic modifications to coastal systems. Understanding how these processes have affected sediment delivery and accumulation on the shelf in the past may provide insight into potential changes in the future. To address this, we investigated shelf sedi
Authors
Joseph Carlin, Jason A. Addison, Amy Wagner, Valerie Evelyn Schwartz, Jamie Hayward, Victoria Severin