A new method to estimate the vent location and dispersal axis of tephra fall deposits based on thickness measurements
About the Event:
In this work, a new method to identify the vent location and dispersal axis of tephra fall deposits based on thickness measurements is introduced. The method couples semi-empirical models of tephra thickness distribution with a simple gradient descent method. In this presentation, how the method works is introduced, and thickness datasets of the Fogo A deposit and ash deposits from the North Mono eruption are used for validation. The discussion focuses on evaluating the performance of the method given datasets of different qualities, how to detect model uncertainty, and implications from working with the method.
About the Speaker:
Yang joined the Earth Observatory of Singapore earlier this year, and works as a research fellow in the Volcano Group. He obtained his master and PhD degrees at the University at Buffalo from 2013-2019. As a graduate student, Yang worked on physical properties of tephra fall deposits from the Mono Craters during the late Pleistocene, developing and applying statistical and spatial analysis methods to study tephra fall deposits, and probabilistic volcanic ash fall hazard analysis. Currently, Yang works on investigating physical properties of pyroclastic deposits from the most recent eruptions of the Changbaishan Volcano and its probabilistic volcanic hazard assessment.