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

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   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...

2. Tephra isopach, extent and volume calculation in R

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   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...