A5005977143- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Earthquake Detection and Analysis
- Geochemistry and Geologic Mapping
- Geological formations and processes
- Mineralogy and Gemology Studies
- Methane Hydrates and Related Phenomena
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Tropical and Extratropical Cyclones Research
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Meteorological Phenomena and Simulations
- Geomagnetism and Paleomagnetism Studies
- Polynomial and algebraic computation
- Atmospheric and Environmental Gas Dynamics
- Paleontology and Stratigraphy of Fossils
- NMR spectroscopy and applications
- Astro and Planetary Science
- Geological and Tectonic Studies in Latin America
- Fire effects on concrete materials
- Muscle activation and electromyography studies
- Ionosphere and magnetosphere dynamics
National Museum of Natural History
2016-2025
Smithsonian Institution
2015-2024
University of Louisville
2022-2023
Neurological Surgery
2023
Occidental Petroleum (United States)
2022
ACT
2018
GlaxoSmithKline (United Kingdom)
2017
University of Idaho
2014-2015
University of Michigan–Ann Arbor
2015
The University of Texas at Austin
2008-2013
Global Synthetic Aperture Radar (SAR) measurements made over the past decades provide insights into lateral extent of magmatic domains, and capture volcanic process on scales useful for volcano monitoring. Satellite-based SAR imagery has great potential monitoring topographic change, distribution eruptive products surface displacements (InSAR) at subaerial volcanoes. However, there are challenges in applying it routinely, as would be required reliable operational assessment hazard. The...
This white paper, which is the 10th in a series intended to address issues associated with development of therapeutic oligonucleotides, examines subject product-related impurities. The authors consider chemistry and safety aspects advance arguments favor platform approaches impurity identification qualification. Reporting, identification, qualification thresholds suitable for impurities oligonucleotides are proposed.
Abstract Volcanoes are hazardous to local and global populations, but only a fraction continuously monitored by ground‐based sensors. For example, in Latin America, more than 60% of Holocene volcanoes unmonitored, meaning long‐term multiparameter data sets volcanic activity rare sparse. We use satellite observations degassing, thermal anomalies, surface deformation spanning 17 years at 47 the most active America compare these archived Global Volcanism Program. This first comparison...
Research Article| December 01, 2011 Effects of topography on pyroclastic density current runout and formation coignimbrites Benjamin J. Andrews; Andrews 1Department Mineral Sciences, National Museum Natural History, Smithsonian Institution, 1000 Constitution Avenue Northwest, Washington, D.C. 20004, USA Search for other works by this author on: GSW Google Scholar Michael Manga 2Department Earth Planetary Science, University California−Berkeley, 307 McCone Hall, Berkeley, California 94720,...
Three crystal-poor obsidian samples (one dacite, 67 wt % SiO2; two rhyolites, 73 and 75 SiO2), which erupted effusively from monogenetic vents, contain sparse (<2%) plagioclase phenocrysts that span a remarkably wide continuous range in composition (≤30 mol An). Many, but not all, of the crystals display diffusion-limited growth textures (e.g. swallow-tails, skeletal, vermiform). Hypotheses to explain paradox compositional despite low abundance include (1) incorporation xenocrysts and/or...
Abstract Cosmic ray exposure (CRE) ages provide information about the parent bodies and source regions of meteorite classes. Cosmogenic noble gases are often used to quantify time scales ranging from tens ka hundreds Ma. The production rate cosmogenic is primarily controlled by a meteorite's chemical composition. Historically, an average composition for entire class or subgroup was calculate rates. At scale needed gas measurements, however, some meteorites exhibit mineral abundance...
Abstract Volcan Santiaguito (Guatemala) “breathes” with extraordinary regularity as the edifice's conduit system accumulates free gas, which periodically vents to atmosphere. Periodic pressurization controls explosion timing, nearly always occurs at peak inflation, detected tiltmeters. Tilt cycles in January 2012 reveal regular 26 ± 6 min inflation/deflation corresponding least ~10 1 kg/s of gas fluxing system. Very long period (VLP) earthquakes presage explosions and occur during when...
The Trans-Mexican Volcanic Belt (TMVB) is known for the chemical diversity in its erupted products. We have analyzed olivine, pyroxene, and plagioclase mineral chemistry of 30 geochemically well-characterized mafic eruptives from Isla Maria at western end arc to Palma Sola east. major oxide data indicate dominance open system processes such as antecryst uptake, scarcity mineral-mineral mineral-melt equilibria suggests that apart forming microlites, melts do not significantly crystallize...
&lt;p&gt;The 15 January 2022 eruption of the submarine Hunga Tonga-Hunga Ha'apai (HTHH) volcano (Tonga) ranks among largest volcanic explosions satellite remote sensing era, and perhaps last century. It shares many characteristics with 1883 Krakatau (Indonesia), including atmospheric pressure waves tsunamis, phreatomagmatic interaction magma seawater likely played a major role in dynamics both events. A portion HTHH column rose to lower mesospheric altitudes (~55 km) umbrella cloud...
Abstract 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 cause unrest that simultaneously considers three multiparameter satellite observations. The is based on characteristics system (open, closed, and eruptive) mechanisms (intrusion, evolution, withdrawal) occurring at shallow depths in system. applied these models...
First posted December 19, 2022 For additional information, contact: Director, Volcano Science CenterU.S. Geological Survey1300 SE Cardinal CourtVancouver, WA 38683 A significant number of the world's approximately 1,400 subaerial volcanoes with Holocene eruptions are unmonitored by ground-based sensors yet constitute a potential hazard to nearby residents and infrastructure, as well air travel global commerce. Data from an international constellation more than 60 current satellite...
Research Article| October 01, 2009 Turbulent dynamics of the 18 May 1980 Mount St. Helens eruption column Benjamin J. Andrews; Andrews * 1Department Geological Sciences, Jackson School Geosciences, The University Texas at Austin, 78712, USA *E-mail: andrewsb@mail.utexas.edu. Search for other works by this author on: GSW Google Scholar James E. Gardner Geology (2009) 37 (10): 895–898. https://doi.org/10.1130/G30168A.1 Article history received: 23 Feb rev-recd: 08 accepted: 19 first online: 03...