Publications
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Plateau subduction, intraslab seismicity, and the Denali (Alaska) volcanic gap
Tectonic tremors in Alaska (USA) are associated with subduction of the Yakutat plateau, but their origins are unclear due to lack of depth constraints. We have processed tremor recordings to extract low-frequency earthquakes (LFEs), and generated a set of six LFE waveform templates via iterative network matched filtering and stacking. The timing of impulsive P (compressional) wave and S (shear) wa
Authors
Lindsay Yuling Chuang, Michael Bostock, Aaron Wech, Alexandre Plourde
Combining InSAR and GPS to determine transient movement and thickness of a seasonally active low-gradient translational landslide
The combined application of continuous Global Positioning System data (high temporal resolution) with spaceborne interferometric synthetic aperture radar data (high spatial resolution) can reveal much more about the complexity of large landslide movement than is possible with geodetic measurements tied to only a few specific measurement sites. This approach is applied to an ~4 km2 reactivated tran
Authors
Xie Hu, Zhong Lu, Thomas C. Pierson, Rebecca Kramer, David L. George
Opal-A in glassy pumice, acid alteration, and the 1817 phreatomagmatic eruption at Kawah Ijen (Java), Indonesia
At Kawah Ijen (Indonesia), vigorous SO2 and HCl degassing sustains a hyperacid lake (pH ~0) and intensely alters the subsurface, producing widespread residual silica and advanced argillic alteration products. In 1817, a VEI 2 phreatomagmatic eruption evacuated the lake, depositing a widespread layer of muddy ash fall, and sending lahars down river drainages. We discovered multiple types of opaline
Authors
Jacob B. Lowenstern, Vincent van Hinsberg, Kim Berlo, Moritz Liesegang, Kayla D. Iacovino, Ilya N. Bindeman, Heather M. Wright
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, which is
Authors
Michelle L. Coombs, Jessica F. Larsen, Christina A. Neal
Pleistocene volcanism and shifting shorelines at Lake Tahoe, California
In the northwestern Lake Tahoe Basin, Pleistocene basaltic and trachyandesitic lavas form a small volcanic field comprising ∼1 km3 of lava that erupted from seven vents. Most of these lavas erupted subaerially and produced lava flows. However, where they flowed into an early Lake Tahoe (Proto-Tahoe), they produced deltas consisting of hydrovolcanic breccias as well as pillow lavas draped downslope
Authors
Winifred Kortemeier, Andrew T. Calvert, James G. Moore, Richard Schweickert
Construction of probabilistic event trees for eruption forecasting at Sinabung volcano, Indonesia 2013–14
Eruptions of Sinabung volcano, Indonesia have been ongoing since 2013. Since that time, the character of eruptions has changed, from phreatic to phreatomagmatic to magmatic explosive eruptions, and from production of a lava dome that collapsed to a subsequent thick lava flow that slowly ceased to be active, and later, to a new lava dome. As the eruption progressed, event trees were constructed to
Authors
Heather M. Wright, John S. Pallister, Wendy A. McCausland, Julia P. Griswold, Supriyati Andreastuti, Agus Budianto, Sofyan Primulyana, Maurizio Battaglia, Angie Diefenbach, John W. Ewert, Peter J. Kelly, Christoph Kern, Martin R. LaFevers, Andrew B. Lockhart, Jeffrey N. Marso, Gari C. Mayberry, Steve P. Schilling, Rick Wessels, Randall A. White, Nurnaning Aisyah, Nugraha Kartadinata, Kristianto, Raditya Putra, Ugan Boyson Saing, Agus Solihin, Yasa Suparman, Devy Damil Syahbana, Hetty Triastuty
Hypocenter relocation along the Sunda arc in Indonesia, using a 3D seismic velocity model
The tectonics of the Sunda arc region is characterized by the junction of the Eurasian and Indo‐Australian tectonic plates, causing complex dynamics to take place. High‐seismicity rates in the Indonesian region occur due to the interaction between these tectonic plates. The availability of a denser network of seismometers after the earthquakes of Mw 9.1 in 2004 and Mw 8.6 in 2005 supports various
Authors
Andri Dian Nugraha, Hasbi A. Shiddiqi, Sri Widiyantoro, Clifford H. Thurber, Jeremy D. Pesicek, Haijiang Zhang, Samsul H. Wiyono, Mohamad Ramadhan, Wandano, Mahsyur Irsyam
Volcanic ash activates the NLRP3 inflammasome in murine and human macrophages
Volcanic ash is a heterogeneous mineral dust that is typically composed of a mixture of amorphous (glass) and crystalline (mineral) fragments. It commonly contains an abundance of the crystalline silica (SiO2) polymorph cristobalite. Inhalation of crystalline silica can induce inflammation by stimulating the NLRP3 inflammasome, a cytosolic receptor complex that plays a critical role in driving inf
Authors
David Damby, Claire J. Horwell, Peter J. Baxter, Ulrich Kueppers, Max Schnurr, Donald B. Dingwell, Peter Duewell
Mass addition at Mount St. Helens, Washington, inferred from repeated gravity surveys
Measurements of subtle changes in the Earth’s gravityfield can provideinformation on the addition/loss of mass (e.g., magma or aqueousfluids) beneath a volcano. In this study, wemeasured gravity at Mount St. Helens from 2010 to 2016 to investigate possible mass changes followingthe 2004–2008 dome-forming eruption. The raw gravity measurements were corrected for changes in themass and shape of Crat
Authors
Maurizio Battaglia, Michael Lisowski, Daniel Dzurisin, Michael P. Poland, Steve Schilling, Angela K. Diefenbach, Jeff Wynn
Sediment erosion and delivery from Toutle River basin after the 1980 eruption of Mount St. Helens: A 30-year perspective
Exceptional sediment yields persist in Toutle River valley more than 30 years after the major 1980 eruption of Mount St. Helens. Differencing of decadal-scale digital elevation models shows the elevated load comes largely from persistent lateral channel erosion across the debris-avalanche deposit. Since the mid-1980s, rates of channel-bed-elevation change have diminished, and magnitudes of lateral
Authors
Jon J. Major, Adam R. Mosbrucker, Kurt R. Spicer
Geomorphic response of the Muddy River Basin to the 1980 eruptions of Mount St. Helens, 1980–2000
The 18 May 1980 eruption of Mount St. Helens produced a mosaic of primary landscape disturbances that decreased in intensity with distance from the volcano across the headwaters of Muddy River and its tributaries. Subsequent geomorphic responses were influenced by evolving hillslope and channel conditions that affected fluxes of water, sediment, and wood, as well as by an exceptional storm in Febr
Authors
Thomas E. Lisle, Jon J. Major, J. H. Hardison
Explosive eruptions at the summit of Mauna Loa: Lithology, modeling, and dating
Near Moku‘āweoweo, Mauna Loa’s summit caldera, there are three fans of explosive deposits. The fans, located to the west, northwest, and east, are strongly arcuate in map view. Along ‘Āinapō Trail, 2.8–3.5 km southeast of the caldera, there are several small kīpuka that expose a fourth explosive deposit. Although these explosive deposits have been known for some time, no study bearing on the natur
Authors
Frank A. Trusdell, Jefferson Hungerford, John Stone, Keith Fifield, Kaitlin McCann, Harold Wershow, Shikma Zaarur, Melissa Dimeo Boyd