A5085819966- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies
- Glass properties and applications
- High-pressure geophysics and materials
- Mineralogy and Gemology Studies
- Building materials and conservation
- Methane Hydrates and Related Phenomena
- Seismology and Earthquake Studies
- Meteorological Phenomena and Simulations
- Cultural Heritage Materials Analysis
- Geomagnetism and Paleomagnetism Studies
- Isotope Analysis in Ecology
- Disaster Management and Resilience
- Paleontology and Stratigraphy of Fossils
- Landslides and related hazards
- Tropical and Extratropical Cyclones Research
- Pleistocene-Era Hominins and Archaeology
- Adaptive optics and wavefront sensing
- Geological Modeling and Analysis
- Geological and Geophysical Studies Worldwide
- Geological formations and processes
- Climate variability and models
United States Geological Survey
2014-2022
Cascades Volcano Observatory
2019
American Museum of Natural History
1998-2015
Central Park Conservancy
2005-2009
University of Oxford
2003-2005
University of Rhode Island
1991-1996
Geological Survey of Japan
1996
The origin of tholeiitic (TH) versus calc-alkaline (CA) magmatic trends has long been debated. Part the problem stems from lack a quantitative measure for way in which magma evolves. Recognizing that salient feature manyTH^CA discrimination diagrams is enrichment Fe during evolution, we have developed index enrichment, Tholeiitic Index (THI):THI1⁄4Fe4·0/Fe8·0, where Fe4·0 average FeO* concentration samples with 4 1wt % MgO, and Fe8·0 at 8 MgO. Magmas withTHI41 enriched differentiation...
The External Betic‐Rif arc, which lies between the converging African and Iberian plates, is one of tightest orogenic arcs on Earth. It a thin‐skinned fold thrust belt formed in Miocene time around periphery Alborán Domain, an older contractional orogen that underwent extensional collapse coevally with formation belt. Restoration four sections across belt, together kinematic paleomagnetic analysis, allows reconstruction prethrusting geometry identification following processes contributed to...
We have determined infrared molar absorptivities for water absorption bands in Fe-bearing and Fe-free andesitic glasses. Water dissolves glasses as both hydroxyl groups molecular observed other silicate Concentrations of species are a strong function total content. IR andesite ε3570 = 62.32 ± 0.42 L/mol·cm, ε4500 0.79 0.07 ε5200 1.07 ε1630 42.34 2.77 L/mol·cm. Molar 69.21 0.52 L/mol·cm e3570, 0.89 e4500, 1.46 e5200, 52.05 2.85 ε1630. show significant compositional dependencies that can be...
Eighteen years after dome-forming eruptions ended in 1986, and with little warning, Mount St. Helens began to erupt again October 2004. During the ensuing two years, volcano extruded more than 80×106 m3 of gas-poor, crystal-rich dacite lava. The 2004-6 is remarkably uniform bulk-rock composition and, at 65 percent SiO2 , among richest silica most depleted incompatible elements magmas erupted during past 500 years. Since shortly first spine lava appeared, samples have been collected using a...
We summarize major findings and best-practice recommendations from three Volcano Observatory Best Practices (VOBP) workshops, which were held in 2011, 2013 2016. The workshops brought together representatives the majority of world's volcano observatories for purpose sharing information on operation practice these institutions making best recommendations. first workshop focused eruption forecasting, second hazard communication, third long-term assessment. Subsequent VOBP will address...
Research Article| July 01, 2007 Fluid Immiscibility in Volcanic Environments James D. Webster; Webster Department of Earth and Planetary Sciences, American Museum Natural History, Central Park West at 79th Street, New York, York 10024-5192 U.S.A., jdw@amnh.org, cmandy@amnh.org Search for other works by this author on: GSW Google Scholar Charles W. Mandeville Author Article Information Publisher: Mineralogical Society America First Online: 09 Mar 2017 © The Of Reviews Mineralogy Geochemistry...
Research Article| April 01, 2010 Sulfur in Magmas Nicole Métrich; Métrich 1Laboratoire Pierre Süe/SIS2M, CNRS-CEA, CE-Saclay, France Search for other works by this author on: GSW Google Scholar Charles W. Mandeville 2American Museum of Natural History Central Park West at 79th Street, New York, NY 10024, USA E-mail: nicole.metrich@cea.fr; cmandy@amnh.org Author and Article Information Publisher: Mineralogical Society America First Online: 09 Mar 2017 Online ISSN: 1811-5217 Print 1811-5209 ©...
The paroxysmal 1883 eruption of Krakatau volcano in Indonesia discharged at least 6.5 km 3 (dense rock equivalent) pyroclastic material into the shallow waters Sunda Straits within a 15‐km radius volcano. Progressive thermal demagnetization studies individually oriented pumice clasts from core sample submarine deposits show that 41 out 47 exhibit single‐component remanence with mean inclination −2.4°. partial thermoremanent magnetization components both and lithic are well grouped...
The nature of the submarine deposits produced by 1883 Krakatau eruption in Indonesia has remained controversial for more than a century. Knowledge their character, however, is critical to understanding origin devastating tsunamis generated during event, which claimed about 36,000 lives. Results 1990 marine geological investigation reported here demonstrate that are largely pyroclastic flow origin. Pyroclastic flows partially fluidized mixtures particles and gases travel up 150 m/s have...
Research Article| April 01, 2010 Sulfur: A Ubiquitous and Useful Tracer in Earth Planetary Sciences Charles W. Mandeville *Dept. of American Museum Natural History Central Park West at 79th Street New York, NY 10024-5192, USA E-mail: cmandy@amnh.org Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Mineralogical Society America First Online: 09 Mar 2017 Online ISSN: 1811-5217 Print 1811-5209 © the Elements (2010) 6 (2): 75–80....