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...

ECMapProb

21 May 2018 | Contributor(s): Alvaro Aravena, Raffaello Cioni

Probability map of PDC by using a modifed approach of the energy cone model and topographic information derived from the SRTM 30 m elevation model.

1st IAVCEI/GVM Workshop: "From Volcanic Hazard to Risk Assessment", Geneva, 27-29 June 2018

18 Dec 2018 | Contributor(s): Costanza Bonadonna, Sebastien Biass, Eliza S Calder, Corine Frischknecht, Chris Eric Gregg, Susanna Jenkins, Sue C Loughlin, Scira Menoni, Shinji Takarada, Tom Wilson

The complexity of volcanic risk analysis typically resides in the interaction of multiple hazard, vulnerability and exposure aspects dynamically acting over various spatial and temporal scales. Risk analyses provide an evidence-based approach to development and implementation of proactive...

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...

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...

MAMMA (Magma Ascent Mathematical Modeling and Analysis)

01 Mar 2018 | Contributor(s): Alvaro Aravena, Mattia de' Michieli Vitturi

1D-steady state model for volcanic conduits

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...

2017 AGU Fall Meeting Session - V036: Volcanic Ash—Generation, Transport, Impacts, and Applications

20 Jun 2017 | Contributor(s): Peter W Webley

Dear all,We invite you to submit an abstract to our session and look forward to you joining us at AGU 2017 in New Orleans, December 11 - 15, 2017.V036: Volcanic Ash—Generation, Transport, Impacts, and ApplicationSession ID#:...

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...

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...

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...

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...

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...

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...

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...

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.

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...

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;...

An assessment of hydrothermal alteration in the Santiaguito lava dome complex, Guatemala: implications for dome collapse hazards

28 Feb 2013 | Contributor(s): Jessica L. Ball, Eliza S Calder, Marc Bernstein

A combination of field mapping, geochemistry, and remote sensing methods has been employed to determine the extent of hydrothermal alteration and assess the potential for failure at the Santiaguito lava dome complex, Guatemala. The 90-year-old complex of four lava domes has only experienced...