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Understanding Masaya Volcano – The Science Behind Its Basaltic Plinian Eruptions
Description
How can a "well-behaved" volcano produce explosions that dwarf Mount St. Helens? In the Season Two premiere, host Dr. Jeffrey Zurek explores the deadly volcanic paradox of Nicaragua’s Masaya Volcano.
Masaya is a "persistently active" shield volcano, yet the geologic record reveals a history of violent Basaltic Plinian eruptions. By "probing the crystals" through melt inclusion geochemistry, this episode uncovers a massive hidden magma budget and explores the "Glass Transition" trigger that turns a steady flow into a cataclysmic blast.
Inside the Episode
- The Plinian Mystery: Why fluid basaltic magma sometimes decides to fragment and explode.
- Melt Inclusions: Using tiny snapshots of magma trapped in crystals to see deep into the Earth.
- The 40km³ Magma Budget: Calculating 250 years of hidden, un-erupted magma.
- Tectonic Triggers: How pull-apart faults allow for massive deep-seated reservoirs.
- Brittle Magma: The Glass Transition Temperature as a mechanism for runaway explosive energy.
Show Timeline
(00:00) Season 2 Kickoff and Summer Updates
(03:00) Why Masaya is the Perfect Lab
(06:45) Pliny the Younger and Mount Vesuvius
(09:00) Drivers of Eruptions: Gas and Viscosity
(11:15) Non-Newtonian Flow and Ketchup Bottles
(13:00) Silicon and Oxygen: Volcanic Polymerizers
(18:00) The Paradox of Masaya’s Basaltic Ash
(20:15) Melt Inclusions: Snapshots of Deep Glass
(23:00) Decoding the Olivine Solid Solution Series
(31:45) The Missing 40 Cubic Kilometers of Magma
(37:30) Cooling and the Fragmentation Trigger
(40:00) Hazard Realities for Masaya City Residents
Links & Resources
Paper of the episode: https://www.sciencedirect.com/science/article/abs/pii/S0377027318303470
Basaltic plinian eruptions at Masaya example:
- Support: Pateron
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Whimsical Wavelengths: Deep-dive conversations where a working scientist unpacks how we know what we know, one paper, one idea, or whimsical detour at a time. Hosted by Dr. Jeffrey Zurek (P.Geo).