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  1. Sequential fragmentation/transport model applied to Irazu volcano, Costa Rica. Positive dispersion case

    21 Mar 2015 | Contributor(s): Jose Brenes

    Sequential fragmentation/transport model was applied to ash deposits of 1723 eruption of  Irazu volcano, Costa Rica.  Some 25% of the sub-populations showed positive dispersion values, which were associated to a new fractal dimension,. With the help of Mandelbrot fractal relationship...

  2. Use of SFT in Irazu volcano. Negative dispersion case

    21 Mar 2015 | Contributor(s): Jose Brenes

    Sequential fragmentation/transport model was applied to Irazu volcano, Costa Rica. Fragmentation coefficient line was treated under a new light

  3. Fallout tephra simulation for free

    06 Jan 2015 | Contributor(s): Jose Brenes

    GreetingsI am a retired Physics professor at Universidad de Costa Rica who is now tackling some volcanlogical issues, although my original field of study was superconductivity!!! QUITE A CHANGEAdjoint you will find some ideas I have being testing. You are encourage to give me your frank...

  4. AGU Poster: Results of the Tephra 2014 Workshop on Maximizing the Potential of Tephra for Multidisciplinary Science

    11 Dec 2014 | Contributor(s): Stephen C Kuehn, Solene Pouget, Kristi L Wallace, Marcus I Bursik

    Poster presentation from the 2014 AGU Fall Meeting reporting on results and conclusions of the Tephra 2014 workshop

  5. Tephra 2014 Field Trip Guide

    08 Dec 2014 | Contributor(s): Stephen C Kuehn

    Guidebook for the field trip to Mount Saint Helens conducted 4-August-2014 as part of the Tephra 2014 workshop.

  6. Monogenetic volcanism of the Michoacán-Guanajuato Volcanic Field: Maar craters of the Zacapu basin and domes, shields, and scoria cones of the Tarascan highlands (Paracho-Paricutin region) Pre-meeting field guide for the 5th International Maar Confer

    01 Dec 2014 | Contributor(s): Claus Siebe, Marie-Noëlle Guilbaud, Sergio Salinas, Pooja Kshirsagar, Magdalena Oryaëlle Chevrel, Juan Ramón de la Fuente, Athziri Hernández Jiménez, Lourdes Godínez

    Monogenetic volcanism of the Michoacán-Guanajuato Volcanic Field: Maar craters of the Zacapu basin and domes, shields, and scoria cones of the Tarascan highlands (Paracho-Paricutin region)A pre-meeting fieldtrip (November 13-17) prior to the 5th International Maar Conference...

  7. Contrasting eruptive styles of late Pleistocene-to-Holocene monogenetic volcanism from maars to domes in the Serdán-Oriental basin, eastern Mexican Volcanic Belt Post-meeting field guide for the 5th International Maar Conference, Querétaro, México

    01 Dec 2014 | Contributor(s): Gerardo Carrasco-Núñez, Michael H. Ort, Nancy R. Riggs, Brian Zimmer, Lorena De León-Barragán, Mario López-Rojas

    Contrasting eruptive styles of late Pleistocene-to-Holocene monogenetic volcanism from maars to domes in theSerdán-Oriental basin, eastern Mexican Volcanic BeltGerardo Carrasco-Núñez1,*, Michael H. Ort2, Nancy R. Riggs2, Brian Zimmer3,, Lorena De...

  8. The Valle de Santiago maars, México: the record of magma-water fluctuations during the formation of a basaltic maar (La Alberca) and active post-desiccation subsidence at the bottom of a maar lake (Rincón de Parangueo) Intra-conference Field trip 5th

    01 Dec 2014 | Contributor(s): José Jorge Aranda-Gómez, Gerardo Carrasco-Núñez

    The Valle de Santiago maars, México: the record of magma-water fluctuations during the formation of a basaltic maar (La Alberca) and active post-desiccation subsidence at the bottom of a maar lake (Rincón de Parangueo)Jóse Jorge Aranda-Gómez* and Gerardo...

  9. Maars associated with fracture- and/or conduit-controlled aquifers in folded limestone in San Luis Potosí, México Pre-conference Field trip 5th International Maar Conference, Querétaro, México

    01 Dec 2014 | Contributor(s): José Jorge Aranda-Gómez, Pablo Dávila-Harris

    Maars associated with fracture- and/or conduit-controlled aquifers in folded limestone in San Luis Potosí, MéxicoJosé Jorge Aranda-Gómez1,*, Pablo Dávila-Harris2, **1 Centro de Geociencias, Universidad Nacional autónoma de México, UNAM Campus...

  10. 5th International Maar Conference - Abstract Book - 2014

    01 Dec 2014 | Contributor(s): Carrasco-Núñez G., Aranda-Gómez J.J., Ort M.H., Silva-Corona J.J.

  11. Contribution of methane to total gas pressure in deep waters at lakes Nyos and Monoun (Cameroon, West Africa)

    17 Jul 2014 | Contributor(s): Issa, Takeshi Ohba, Wilson Fangtong, Alain Fouepe, CHAKO TCHAMABE Boris, Yukata Yoshida, Minoru Kusakabe, Sigha Kamdjou, Urumu TSUNOGAI, Yu Uginuma, Greg Zinkeng Tanyileke, Hell J.V.

    https://www.jstage.jst.go.jp/article/geochemj/47/3/47_2.0250/_article

  12. MeMoVolc workshop on the "Dynamics of volcanic explosive eruptions", Consensual Document

    15 Jul 2014 | Publications | Contributor(s): Costanza Bonadonna, Raffaello Cioni, Antonio Costa, Tim Druitt, Jeremy Phillips, Laura Pioli

    This workshop served to assess the main advantages and shortcomings of existing eruption classification schemes and to identify open questions and research priorities that could help improve our understanding of volcanic explosive eruptions. We identified the main parameters and processes...

  13. Pyroclastic density currents and local topography as seen with the conveyer model

    15 Apr 2014 | Publications | Contributor(s): Domenico M. Doronzo

    Pyroclastic density currents (PDCs) are multiphase flows generated during explosive volcanic eruptions, and they move down the volcano, and over the surrounding topography. The flow-topography interaction can play a fundamental role in the sedimentary processes, and in the resulting deposit...

  14. CVS Newsletter (Sept 2004)

    22 Oct 2013 | Publications | Contributor(s): Vern Manville, Richard James Brown

  15. Estimating Volcanic Risk in the Lesser Antilles

    26 Sep 2013 | Publications | Contributor(s): Michal Camejo, Richard E.A. Robertson

    The potential catastrophic effects of future volcanic eruptions in the Lesser Antilles can be decreased by the utilisation of effective risk quantification measures and their subsequent incorporation into disaster risk reduction strategies. A volcanic risk study conducted by the Norwegian...

  16. Spherulites and thundereggs from pitchstones of the Deccan Traps: geology, petrochemistry, and emplacement environments

    18 Sep 2013 | Publications | Contributor(s): Pooja Vinod Kshirsagar

    Spherulites and thundereggs are rounded, typically spherical, polycrystalline objects found in glassy silicic rocks. Spherulites are dominantly made up of radiating microscopic fibers of alkali feldspar and a silica mineral (commonly quartz). They form due to heterogeneous nucleation in highly...

  17. Mafic alkalic magmatism in central Kachchh, India- a monogenetic volcanic field in the northwestern Deccan Traps

    18 Sep 2013 | Publications | Contributor(s): Pooja Vinod Kshirsagar, Badre Alam shaikh, Hetu Sheth

    Magmatism in Kachchh, in the northwestern Deccan continental flood basalt province, is represented not only by typical tholeiitic flows and dikes, but also plug-like bodies, in Mesozoic sandstone, of alkali basalt, basanite, melanephelinite and nephelinite, containing mantle nodules. They form...

  18. Global volcanic unrest in the 21st century: An analysis of the first decade

    16 Sep 2013 | Publications | Contributor(s): Jo Gottsmann, Rosa Sobradelo

    We define volcanic unrest as the deviation from the background or baseline behaviour of a volcano towards a behaviour which is a cause for concern in the short-term because it might prelude an eruption. When unrest is preceded by periods of quiescence over centuries or millennia it is...

  19. September 4th notes from PWW

    04 Sep 2013 | Publications | Contributor(s): Peter W Webley

  20. 40Ar/39Ar Geochronology Results for Lunar Crater Volcanic Field Basalts, Nevada

    21 May 2013 | Publications | Contributor(s): Matthew T Heizler

    Full references (two reports):Heizler MT (2013) 40Ar/39Ar Geochronology Results for Lunar Crater Volcanic Field Basalts, Nevada. New Mexico Geochronological Research Laboratory internal report NMGRL-IR-792, https://vhub.org.resources/2503.Heizler MT (2014) 40Ar/39Ar Geochronology Results for...