十万个为什么·科学阅读30篇（4）
17 / 30
正在确认阅读权限…
Why Do Some Volcanoes Emit Blue Flames Instead of Red Lava?
为什么有些火山喷发蓝色火焰而非红色岩浆？
-
Blue flames at volcanoes like Indonesia’s Kawah Ijen come from ignited sulfur vapor—not burning lava.
-
Underground sulfur deposits melt and rise through cracks, then ignite spontaneously upon contact with air.
-
The combustion produces bright blue flames visible even in daylight and emits toxic sulfur dioxide gas.
-
Temperatures exceed 600°C, but the blue color comes from excited molecular sulfur emitting at 450 nm.
-
Unlike red-orange lava glow, which results from thermal radiation, this is chemiluminescence from chemical reactions.
-
Local miners collect cooled sulfur for industrial use despite hazardous working conditions and poor ventilation.
-
Scientists use spectrometers to distinguish sulfur flame signatures from other volcanic heat sources.
-
This phenomenon occurs only where high-sulfur magma interacts with hydrothermal systems near the surface.
-
Nighttime photography reveals dramatic blue rivers of fire flowing down crater walls.
-
Monitoring flame intensity helps volcanologists assess subsurface gas pressure and eruption risk.