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October 1, 2024

We all know that volcanoes are figuratively cool, but sometimes it can be a challenge to convey the concept of just how hot they can get.

At volcanoes with silica-rich magmas, like the rhyolites of the Mono-Inyo Craters (first photo), eruption temperatures are somewhere around 800°-1000°C (1470° - 1830°F). At volcanoes like Medicine Lake which produce basaltic to basaltic andesite magmas (second photo), the eruption temperature can be as high as 1100° to 1250°C (2010°-2280°F). But what does this feel like if you could (safely) experience the temperatures in an eruption?

 

A rubbly black flow of basalt lava, erupted at around 1250°C (2280°F) from the Medicine Lake Volcano. In the distance, the slopes of a scoria cone volcano are covered with similar lava flows and dark pine trees.
Photograph looking south across the rugged andesitic northern end of the compositionally zoned Callahan Flow toward the main vent at Cinder Butte (partly covered by snow). USGS photograph by Tanya Blacic.
Viewed from overhead, the gray and rubbly rhyolite lava domes of the Mono-Inyo Craters are interspersed with smooth patches of volcanic ash and scoria. In the distance, a snow-capped mountain range surrounds a broad lake.
Mono Craters consists of a series of high-silica rhyolite lava domes, many erupted within the last 10,000 years. The domes are often steep, glassy, and contain very few phenocrysts. USGS photo by Genna Chiaro.

Let's start with some household appliances. A really fancy hairdryer could get up to 93°C (200°F), while a regular oven might be able to manage 260°C (500°F). So the hairdryer could give you an idea of the temperature of a fumarole or hot springs, while an oven would get you about a quarter of the way to magma temperature. If you've ever stood in front of an open oven, that's pretty hot already!

Maybe you know a restaurant with a pizza oven. These might operate at 370°-540°C (700°-1000°F), and they can cook a pizza in only a minute or two. That's about the average temperature of a pyroclastic flow, which are known for burning and melting everything in their path. Or, maybe you've seen a glassblowing demonstration? Melting raw materials into workable glass happens around 1320°C (2400°F), and working temperature is 870°-1040°C (1600°-1900°F). Those are nearly the right temperature ranges to simulate the feel of molten lava - so if you really want to know what a lava flow feels like up close, you just need to stand near a glassblowing furnace! (But definitely don't do this without permission from the glassblower. There's a good reason they and volcanologists both wear protective gear!)

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