Publications
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Six-axis ground motion measurements of caldera collapse at Kīlauea Volcano, Hawaiʻi - More data, more puzzles?
Near‐field recordings of large earthquakes and volcano‐induced events using traditional seismological instrumentation often suffer from unaccounted effects of local tilt and saturation of signals. Recent hardware advances have led to the development of the blueSeis‐3A, a very broadband, highly sensitive rotational motion sensor. We installed this sensor in close proximity to permanently deployed c
Authors
Joachim Wassermann, Felix Bernauer, Brian Shiro, Ingrid Johanson, Frederic Guattari, Heiner Igel
Local earthquake Vp and Vs tomography in the Mount St. Helens region with the iMUSH broadband array
We present new 3-D P wave and S wave velocity models of the upper 20 km of the Mount St. Helens (MSH) region. These were obtained using local-source arrival time tomography from earthquakes and explosions recorded at 70 broadband stations deployed as part of the imaging Magma Under St. Helens (iMUSH) project and augmented by several data sets. Principal features of our models include (1) low P wav
Authors
Carl W Ulberg, Kenneth C Creager, Seth C. Moran, Geoffrey A Abers, Weston Thelen, Alan Levander, Eric Kiser, Brandon Schmandt, Steven M. Hansen, Robert S. Crosson
Phase equilibrium of a high-SiO2, andesite at fO2 = RRO: Implications for Augustine volcano and other high-fO2 arc andesites
Understanding the impact of magmatic plumbing systems on explosive volcanic activity is important for hazard management. This study describes phase equilibria experiments using a high-silica andesite (HSA; SiO2 = 62.5 wt%) from the 2006 eruption of Augustine Volcano, Alaska. Experiments were conducted under H2O saturated conditions, f02f02 = RRO (Re–ReO2 or ~ Ni–NiO + 2), at pressures of 50–200 MP
Authors
Sarah H. De Angelis, Jessica F. Larsen, Michelle L. Coombs, James E. P. Utley, Andrew P. Dunn
Timescales of magmatic processes in post-collisional potassic lavas, northwestern Tibet
Post-collisional potassic volcanic rocks on the Tibetan Plateau are widespread, but geologically young (<375 ka) volcanism suitable for 238U-230Th geochronology is rare on the plateau. The geologically young Ashikule volcanic field from northern Tibet offers an excellent opportunity for studying high-resolution timescales of magmatism in continental collision zones. Here we report U-Th crystalliza
Authors
Haibo Zou, Jorge A. Vazquez, Qicheng Fan
High-resolution imaging of hydrothermal heat flux using optical and thermal Structure-from-Motion photogrammetry
Quantifying hydrothermal heat flux at meter-scale resolution over N0.25 km2 is required to bridge in-situ heat flux and satellite-based measurements. We advance a methodology that blends ground-based daytime optical and nighttime thermal infrared (TIR) imagery using Structure-from-Motion photogrammetry to map radiant hydrothermal heat flux over these scales at sites with low signal-to-noise ratios
Authors
Aaron Lewis, Robert Sare, Jennifer L. Lewicki, George Hilley
Did ice-charging generate volcanic lightning during the 2016–2017 eruption of Bogoslof volcano, Alaska?
The 2016–2017 shallow submarine eruption of Bogoslof volcano in Alaska injected plumes of ash and seawater to maximum heights of ~ 12 km. More than 4550 volcanic lightning strokes were detected by the World Wide Lightning Location Network (WWLLN) and Vaisala’s Global Lightning Dataset (GLD360) over 9 months. Lightning assisted monitoring efforts by confirming ash-producing explosions in near-real
Authors
Alexa R. Van Eaton, David J. Schneider, Cassandra Marie Smith, Matthew M. Haney, John J. Lyons, Ryan Said, David Fee, Robert H. Holzworth, Larry G. Mastin
Infrasound generated by the 2016-2017 shallow submarine eruption of Bogoslof volcano, Alaska
The 2016–2017 shallow submarine eruption of Bogoslof volcano produced numerous infrasound signals over 9 months that were recorded on six Alaska Volcano Observatory (AVO) arrays at ranges of 59 to over 800 km from the volcano. The lack of geophysical monitoring near Bogoslof and the repeated production of volcanic clouds to flight levels made monitoring by remote infrasound critical during the eru
Authors
John J. Lyons, Alexandra M. Iezzi, David Fee, Hans Schwaiger, Aaron Wech, Matthew M. Haney
Upper plate heterogeneity along the Southern Hikurangi Margin, New Zealand
Controlled and natural source seismic data are used to build a 3-D P wave model for southern North Island, New Zealand, where the Pacific Plate subducts beneath the Australian Plate at a rate of ~41 mm/year. Our analysis reveals an abrupt along-strike transition in overthrusting plate structure within Cook Strait. Contrasts in properties (Vp, Vp/Vs, and Qs) likely reflects the degree of deformatio
Authors
Stuart Henrys, Donna Eberhart-Phillips, Dan Bassett, Rupert Sutherland, David Okaya, Martha Savage, Dominic Evanzia, Tim A. Stern, Hiroshi Sato, Kimihiro Mochizuki, Takaya Iwasaki, Eiji Kurashimo, Anya Seward, Aaron Wech
Constraints on eruption processes and event masses for the 2016–2017 eruption of Bogoslof volcano, Alaska, through evaluation of IASI satellite SO2 masses and complementary datasets
Bogoslof volcano, Alaska, experienced at least 70 explosive eruptions between 12 December 2016 and 31 August 2017. Due to its remote location and limited local monitoring network, this eruption was monitored and characterized primarily using remote geophysical and satellite techniques. SO2 emissions from Bogoslof were persistently detected by the Infrared Atmospheric Sounding Interferometer (IASI)
Authors
Taryn Lopez, Lieven Clarisse, Hans Schwaiger, Alexa R. Van Eaton, Matthew W. Loewen, David Fee, John J. Lyons, Kristi L. Wallace, Cheryl Searcy, Aaron Wech, Matthew M. Haney, David J. Schneider, Nathan Graham
An experimental investigation of interaction between andesite and hyperacidic volcanic lake water
Alteration in magmatic-hydrothermal systems leads to distinct changes in rock texture and mineralogy, and a strong redistribution of elements between fluid and rock. Here, we experimentally interacted andesite scoria with hyperacidic, high-sulfidation style fluids from Kawah Ijen volcano (Indonesia) at 25 and 100˚C, seeking to reproduce the textures observed in natural samples from this volcano, a
Authors
Vincent van Hinsberg, Kim Berlo, Jacob B. Lowenstern
Petrologic insights into rift zone magmatic interactions from the 2011 eruption of Kīlauea Volcano, Hawaiʻi
The high frequency of historical eruptions at Kīlauea Volcano presents an exceptional opportunity to address fundamental questions related to the transport, storage, and interaction of magmas within rift zones. The Nāpau Crater area on Kīlauea’s East Rift Zone (ERZ) experienced nine fissure eruptions within 50 years (1961–2011). Most of the magma intruded during these frequent eruptions remained s
Authors
Brett H. Walker, Michael O. Garcia, Tim R. Orr
Using conceptual models to relate multiparameter satellite data to subsurface volcanic processes in Latin America
Satellite data have been extensively used to identify volcanic behavior. However, the physical subsurface processes causing any individual manifestation of activity can be ambiguous. We propose a classification scheme for the cause of unrest that simultaneously considers three multiparameter satellite observations. The scheme is based on characteristics of the volcanic system (open, closed, and er
Authors
Kevin Reath, Matthew Pritchard, Juliet Biggs, Ben Andrews, Susi Ebmeier, Marco Bagnardi, Társilo Girona, Paul Lundgren, Taryn Lopez, Michael P. Poland