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Why Do Some Volcanoes Emit Blue Flames During Eruptions?
为什么有些火山喷发时会喷出蓝色火焰？
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Blue flames occur when sulfur-rich gases ignite spontaneously upon contact with oxygen in cool air.
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This happens most often at volcanoes like Indonesia’s Kawah Ijen, where sulfur deposits are abundant.
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The combustion temperature exceeds 600°C, producing intense blue light visible even in daylight.
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Unlike lava glow, blue fire emits no significant heat radiation detectable from afar.
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Geologists measure gas composition using drones equipped with infrared spectrometers safely.
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Local miners collect burning sulfur for industry, working near active blue-flame vents daily.
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The phenomenon requires both high sulfur concentration and precise oxygen mixing ratios.
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Volcanic lightning sometimes triggers ignition, but most flames burn steadily without sparks.
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Scientists link blue flame frequency to magma degassing rates beneath the crater lake.
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Monitoring flame color and intensity helps forecast explosive eruptions weeks in advance.