Results 71 to 80 of about 1,548 (169)

Decaying lava extrusion rate at El Reventador Volcano, Ecuador measured using high-resolution satellite radar [PDF]

, 2017
Lava extrusion at erupting volcanoes causes rapid changes in topography and morphology on the order of tens or even hundreds of metres. Satellite radar provides a method for measuring changes in topographic height over a given time period to an accuracy ...
Anderson, K., Arnold, D. W. D., Biggs, J., Ebmeier, S. K., Mothes, P., Naranjo, M. F., Vargas, S. Vallejo, Wadge, Geoff   +7 more
core   +5 more sources

A detailed view into the eruption clouds of Santiaguito volcano, Guatemala, using Doppler radar [PDF]

Journal of Geophysical Research: Solid Earth, 2012
Using Doppler radar technology we are able to show that eruptions at Santiaguito volcano, Guatemala, are comprised of multiple explosive degassing pulses occurring at a frequency of 0.2 to 0.3 Hz. The Doppler radar system was installed about 2.7 km away from the active dome on the top of Santa Maria volcano.
Scharff, L., Ziemen, F., Hort, M., Gerst, A., Johnson, J.   +4 more
openaire   +2 more sources

Recursos actuales y necesidades futuras: el caso de Santiaguito

Cuadernos de difusión, 2007
Santiaguito is a district in Peru’s northern Andes. In this paper we identify a number of opportunities to channel efforts towards its development. However, and as it is often the case, only the most explicit and obvious variables guide the development planning and management cycle. A non factual prospective analysis exercise allows to imagine a future
openaire   +2 more sources

Investigation of the effect of inert inclusions on densification during solid-state sintering of metal matrix composites

Science and Engineering of Composite Materials, 2017
Solid-state sintering is the most used process to produce composites. In this paper, the effect of inert inclusions on densification during sintering was evaluated for Cu-WC and Cu-W composites, which have several industrial applications.
Cabezas Jose L., Olmos Luis, Vergara-Hernández Hector J., Garnica Pedro, Jiménez Omar, Mondragón-Sánchez Maria L., Lemus-Ruiz Jose   +6 more
doaj   +1 more source

Early Analysis of Landsat-8 Thermal Infrared Sensor Imagery of Volcanic Activity [PDF]

, 2014
The Landsat-8 satellite of the Landsat Data Continuity Mission was launched by the National Aeronautics and Space Administration (NASA) in April 2013. Just weeks after it entered active service, its sensors observed activity at Paluweh Volcano, Indonesia.
Bailey, Blackett, Boltzmann, Carter, Fisher, Gawarecki, Giglio, Glaze, Harris, Harris, Harris, Harris, Irons, Justice, Matthew Blackett, Murphy, Oppenheimer, Pieri, Planck, Ramsey, Rothery, Rothery, Sahetapy-Engel, Schott, Smith, Solikhin, Stefan, Wan, Wien, Wooster, Wright, Wright   +31 more
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Nonlinear phenomena in fluids with temperature-dependent viscosity: an hysteresis model for magma flow in conduits

, 2002
Magma viscosity is strongly temperature-dependent. When hot magma flows in a conduit, heat is lost through the walls and the temperature decreases along the flow causing a viscosity increase. For particular values of the controlling parameters the steady-
Costa, Antonio, Macedonio, Giovanni
core   +1 more source

A Low-Cost Smartphone Sensor-Based UV Camera for Volcanic SO2 Emission Measurements [PDF]

, 2017
Recently, we reported on the development of low-cost ultraviolet (UV) cameras, based on the modification of sensors designed for the smartphone market.
Andrew McGonigle, Giancarlo Tamburello, Jon Willmott, Tamburello, Thomas Wilkes, Tom Pering   +5 more
core   +2 more sources

Measuring large topographic change with InSAR: Lava thicknesses, extrusion rate and subsidence rate at Santiaguito volcano, Guatemala [PDF]

Earth and Planetary Science Letters, 2012
Lava flows can produce changes in topography on the order of 10s-100s of metres. A knowledge of the resulting volume\ud change provides evidence about the dynamics of an eruption. We present a method to measure topographic changes from the\ud differential InSAR phase delays caused by the height differences between the current topography and a Digital ...
Ebmeier, S. K., Biggs, J., Mather, T. A., Elliott, J. R., Wadge, G., Amelung, F.   +5 more
openaire   +3 more sources

Turbulent ‘stopping plumes’ and plume pinch-off in uniform surroundings [PDF]

, 2014
Observations of turbulent convection in the environment are of variously sus- tained plume-like flows or intermittent thermal-like flows. At different times of the day the prevailing conditions may change and consequently the observed flow regimes may ...
AA Townsend, Athina Kattimeri, B Castaing, BJ Uscinski, BM Cetegen, BM Cetegen, BM Cetegen, BR Morton, C Lei, CD Ahrens, DR Unger, F Witham, GJS Bluth, GM Horsch, GR Hunt, GR Hunt, J Norbury, JCR Hunt, JCR Hunt, JCR Hunt, JO Backhaus, JS Turner, LE Fraenkel, LE Fraenkel, LN Howard, Matthew M. Scase, MJM Hill, MM Scase, MM Scase, MM Scase, MM Scase, PN Papanicolaou, PR Holland, R Hollerback, RQ Wang, RS Scorer, RS Scorer, S Grossmann, WI Rose   +38 more
core   +2 more sources

Impacto ambiental del turismo en áreas naturales protegidas; procedimiento metodológico para el análisis en el Parque Estatal El Ocotal, México [PDF]

, 2009
Resulta evidente la significativa degradación del entorno natural, producto del intenso desarrollo de las actividades antropogénicas a lo largo del proceso histórico, vinculadas con la explotación y aprovechamiento de los recursos naturales, que han ...
González Vera, Miguel, González Vera, Miguel, PEREZ RAMIREZ, CARLOS ALBERTO, PEREZ RAMIREZ, CARLOS ALBERTO, Zizumbo Villareal, Lilia, Zizumbo Villareal, Lilia   +5 more
core