Welcome to Dr. Yoshi's world!
Welcome to the world of Dr. Yoshi! My name is Johan Gilchrist (Yoshi is my nickname) and I am a Glaciologist working for Newmont Mining at Brucejack Mine in NW British Columbia where I study the Knipple glacier to help maintain our one-of-kind glacier access road. I am also a volcanologist in my free time and currently working to publish the last chapter of my PhD thesis that investigates the multiphase fluid dynamics of explosive volcanic eruptions, such as the 1980 eruption of Mt. St. Helens, using a combination of field-, laboratory- and computer-based methods.
Our research featured in Nature Geoscience explores how the terraced slopes of submarine caldera volcanoes, such as Santorini, Greece, can be used to estimate elusive eruption source conditions. We show that fountain physics causes caldera-forming eruption columns to collapse periodically as doughnut shaped sedimentation waves that impact the sea surface to generate tsunamis, surfing hot rock avalanches, and submarine pyroclastic density currents that build terraced deposits on the seafloor. Our results may help explain why large caldera-forming eruptions, like the Jan 15, 2022 eruption of Hunga Tonga Hunga-Ha'apai, can have surprisingly little effects on climate. Free to download for a limited time here:
Listen to my overview of our work on CBC Radio's Quirks and Quarks:
Hunga Tonga Hunga Ha'apai Eruption
NASA GOES-West Satellite view of the January 15, 2022 climactic eruption of Hunga Tonga Hunga Ha'apai volcano. Photo credit: NOAA.
Dr. Johan Gilchrist (he/him/his)