Please use this identifier to cite or link to this item:
Title: On the dynamics of persistently degassing volcanoes from new physics-based approaches
Authors: Girona, Társilo
Keywords: DRNTU::Science::Geology::Volcanoes and earthquakes
Issue Date: 2015
Source: Girona, T. (2015). On the dynamics of persistently degassing volcanoes from new physics-based approaches. Doctoral thesis, Nanyang Technological University, Singapore.
Abstract: Persistently degassing volcanoes are the most active sub-aerial volcanoes around the world. Their activity consists of passive degassing periods interspersed by eruptions every few months or years. I present three new physics-based studies that unravel the underlying dynamics of these volcanoes. First, I calculate the pressure changes induced by the gas release during quiescence. A key finding is that magma reservoirs can depressurize several MPa within the inter-eruptive timescales, which suggests that passive degassing can induce unrest episodes and eruptions. Second, I develop a method to monitor the high-frequency water vapor emissions using light scattering theory and analysis of digital images. I show that degassing of Erebus and Mayon volcanoes emerges as a fractal phenomenon. Third, I simulate the bubble dynamics of volcanic conduits to investigate the processes leading to phreatic eruptions. I found that they can be preceded by amplitude and frequency shifts in the gas emission time series. These studies give new insights on the dynamics of persistently degassing volcanoes, and help to improve the monitoring and interpretation of degassing time series.
DOI: 10.32657/10356/62201
Schools: School of Physical and Mathematical Sciences 
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Theses

Files in This Item:
File Description SizeFormat 
Tarsilo_Girona_PhD_hard_bound.pdf14.27 MBAdobe PDFThumbnail

Page view(s) 50

Updated on Sep 26, 2023

Download(s) 20

Updated on Sep 26, 2023

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.