-
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...
-
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...
-
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...
-
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...
-
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...
-
Spread sheet to calculate tephra volume for exponential thinning
03 Dec 2014 | 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...
-
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...
-
Tephra2 Source Code
14 Jul 2010 | Contributor(s):: Chuck B Connor, Leah Michelle Courtland
Tephra2 uses the advection diffusion equation to forecast tephra dispersion in a given location based on a user-defined set of eruptive conditions.Tephra2 codes are now maintained on GitHub: https://github.com/geoscience-community-codes/tephra2 Available are:1-processor...