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  1. Tephra inversion with Tephra2 and the Metropolis-Hastings algorithm

    21 Jun 2020 | Contributor(s): Qingyuan Yang, E Bruce Pitman, Marcus I Bursik, Susanna Jenkins

    We couple the Metropolis-Hastings algorithm (Hastings, 1970) with the volcanic ash transport model Tephra2 (Bonadonna et al, 2005; 2010), and present the coupled algorithm as a new method to estimate the Eruption Source Parameters (ESPs) of volcanic eruptions based on mass per unit area...

  2. A new method to identify the vent location of tephra fall deposits based on thickness or maximum clast size measurements (SVL)

    17 Apr 2018 | Contributor(s): Qingyuan Yang, Marcus I Bursik, E Bruce Pitman

    This tool presents a new method to identify the vent location of tephra fall deposits based on thickness or maximum clast size measurements. It is temporarily named "svl", which is short for Source Vent Locator. The method estimates the vent location by coupling semi-empirical models...

  3. INQUA–INTAV International Field Conference and Workshop: Crossing New Frontiers

    14 Mar 2018 | Contributor(s): Marcus I Bursik

    The INQUA International Focus Group on Tephrochronology and Volcanism (INTAV) cordially invites you to participate in the Crossing New Frontiers - Tephra Hunt in Transylvania international field conference that aims to continue the long tradition of very successful inter-INQUA congress tephra...

  4. Mono-Inyo Tephra Database

    01 Aug 2017 | Contributor(s): Marcus I Bursik

    The Mono-Inyo Craters is a zone of active volcanism in California, USA, that extends from Mammoth Mountain and Long Valley caldera in the south to the islands of Mono Lake in the north.  This resource provides the citation for the Mono-Inyo tephra database.  The database can...

  5. Tephra 2017 Workshop : Best practices in tephra collection, analysis, and reporting leading toward better tephra databases

    15 Jun 2017 | Contributor(s): Marcus I Bursik, Stephen C Kuehn, Kristi L Wallace, Andrei V Kurbatov

    Best practices in tephra collection, analysis, and reporting: Leading toward better tephra databasesThis is a page for the Tephra 2017 workshop, held in Portland, OR, 19 August 2017.  The workshop was a follow-on to the Tephra 2014 workshop, held 3-7 August 2014, also in...

  6. La erupción del volcán Calbuco en 2015: Volcanología, sociedad y ecosistemas

    25 Apr 2017 | Contributor(s): Jorge E. Romero

    La erupción del 22-23 de abril de 2015 del Volcán Calbuco tuvo impactos en las actividades sociales y ecosistemas en el sur de Chile y en Argentina, debido a la espesa caída de piroclastos, corrientes calientes de gases y rocas, además de flujos de lodo...

  7. TephraProb: a Matlab package for probabilistic hazard assessments of tephra fallout

    15 Sep 2016 | Contributor(s): Sebastien Biass, Costanza Bonadonna, Laura J Connor, Chuck B Connor

    Download the code on GitHub: https://github.com/e5k/TephraProbFollow updates on: https://e5k.github.io/TephraProb is a toolbox of Matlab functions designed to produce scenario–based probabilistic hazard assessments for ground tephra accumulation. The toolbox includes a series of...

  8. Maar-diatremes - a course module

    13 Jun 2016 | Contributor(s): Greg A Valentine, Alison Graettinger

    Maar-diatremes are one of the most common volcanic landforms on Earth, and represent an end-member type of volcano whose eruptions are dominated by explosive, subsurface magma-water interaction.  Thus they should form an important component of volcanology courses.  The recent decade has...

  9. Tephra isopach, extent and volume calculation in R

    04 Mar 2016 | Contributor(s): Qingyuan Yang, Marcus I Bursik

    The method presented here is used to interpolate the thickness distribution of tephra fall deposits from point measurements. It first reconstructs the general thickness decay pattern, or "trend," and then models the residuals that cannot be explained by the trend with...

  10. Los depósitos de caída de tefra: Una breve revisión sobre su cuantificación y análisis para la clasificación de erupciones volcánicas explosivas, con ejemplos Latinoamericanos

    15 Nov 2015 | Contributor(s): Jorge E. Romero

    La cuantificación de los depósitos volcánicos es una de las herramientas más utilizadas en la actualidad para clasificar la magnitud de la actividad volcánica y determinar los peligros volcánicos asociados. En el caso especial de las erupciones...

  11. A Matlab implementation of the Carey and Sparks (1986) model

    04 Nov 2015 | Contributor(s): Sebastien Biass, Gholamohssein Bagheri, Costanza Bonadonna

    Download the code on GitHub: https://github.com/e5k/CareySparks86_MatlabFollow updates on: https://e5k.github.io/   This file is a Matlab implementation of the Carey and Sparks (1986) model to estimate i) the plume height above sampling altitude and ii) the wind speed at the...

  12. ASHEE

    14 Aug 2015 | Contributor(s): Matteo Cerminara, Tomaso Esposti Ongaro

    A fluid-dynamic model is developed to numerically simulate the non-equilibrium dynamics of polydisperse gas-particle mixtures forming volcanic plumes. Starting from the three-dimensional N-phase Eulerian transport equations for a mixture of gases and solid particles, we adopt an asymptotic...

  13. Tephra 2014-2020 Document Repository

    01 Jul 2015 | Contributor(s): Marcus I Bursik, Solene Pouget, Stephen C Kuehn, Kristi L Wallace, Andrei V Kurbatov

    Beginning with the consensus document (with three appendices) resulting from the Tephra 2014 Workshop, this is the document repository for the Tephra 2014, 2017 and 2019 Workshops on standardization.The immediate goal of the tephra standardization effort is to translate checklists...

  14. Spread sheet to calculate tephra volume for exponential thinning

    10 Apr 2015 | Contributor(s): Manuel Nathenson, Judy Fierstein

    An Excel spread sheet and instructions are provided to calculate tephra volume for exponential thinning on a log(thickness) versus square root of area plot. The spread sheet calculates volumes for a single straight line and for two straight lines. The equations for the calculations are from...

  15. 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.

  16. Geochemistry and Petrology first response draft

    28 Aug 2014 | Contributor(s): Gudmundur H Gudfinnsson, Armann Hoskuldsson, Níels Örn Óskarsson

    Here are the documents which were presented at the meeting on the 27th of August. Please feel free to download, edit, and then update the files stored here.

  17. TOTGS: Total grainsize distribution of tephra fallout

    20 Jan 2014 | Contributor(s): Seb Biass, Costanza Bonadonna

    NOTE The code is now maintained on GitHub: https://github.com/e5k/TOTGS Follow updates on: https://e5k.github.io/  Quantifying the total grainsize distribution (TGSD) is a necessary step to achieve a thorough characterization of a given tephra deposit. Several methods exist to...

  18. Tephra 2014 - Maximizing the potential of tephra for multidisciplinary science

    09 Jan 2014 | Contributor(s): Steven Kuehn, Solene Pouget, Marcus I Bursik

    Tephra deposits are used by diverse communities: volcanologists, petrologists, tephrochronologists, paleoclimatologists, paleoecologists and archaeologists. To perhaps be too reductionist, volcanologists are generally interested in tephra to understand eruption behavior, frequency, and hazards;...

  19. Olive

    23 Jul 2013 | *Tools | Contributor(s): Joaquin Alberto Cortes

    Olive 2.1.1 a simple fractional crystallization calculator.

  20. Tritone

    13 Mar 2013 | *Tools | Contributor(s): Joaquin Alberto Cortes

    Tritone a mini tool to plot ternary diagrams