Volcanic Lightning: Because Exploding Mountains Aren't Bad Enough

TL;DR

Volcanic lightning, a phenomenon observed during explosive eruptions, is still not fully understood, but it is likely caused by the presence of ash and possibly water in the volcanic clouds.

Transcript

[♪ INTRO] “On the landward side, a fearful black cloud was rent by forked and quivering bursts of flame, and parted to reveal great tongues of fire, like flashes of lightning magnified in size.” That’s what Pliny the Younger, nephew of the naturalist Pliny the Elder, wrote after watching Mount Vesuvius erupt and cover the city of Pompeii with ash i... Read More

Key Insights

• ⛈️ Pliny the Younger's description in 79 CE provides the first known account of volcanic lightning.
• 💨 The popular explanation for volcanic lightning involves the rubbing of ash particles, similar to regular thunderstorms.
• 🤽 Some scientists suggest that water in volcanic clouds may play a significant role in the occurrence of volcanic lightning.
• ⛈️ Ballooning of volcanic lightning clouds at altitudes similar to water-based clouds supports the idea of water's involvement.
• 💦 Research in recent decades has revitalized the hypothesis that water is a primary cause of volcanic lightning.
• ⛈️ Hazards during volcanic eruptions make studying volcanic lightning challenging.
• 😚 While volcanic lightning can be dangerous, it usually remains within a close range of the eruption site.

Questions & Answers

Q: What causes volcanic lightning?

Volcanic lightning is believed to be primarily caused by the presence of ash in explosive volcanic eruptions. However, some scientists suggest that water in the volcanic clouds may also play a role.

Q: How is volcanic lightning studied?

Studying volcanic lightning is challenging due to the hazardous conditions during eruptions. Laboratory experiments and tracking ash mixing have provided evidence supporting the ash hypothesis, but further research is needed.

Q: Can volcanic lightning be dangerous for humans?

While rare, volcanic lightning can pose risks. It can cause forest fires and, in some cases, even result in fatalities. However, it generally stays close to the eruption site, so those in immediate danger have other concerns.

Q: Is the understanding of volcanic lightning conclusive?

The current understanding suggests that ash is the primary cause of volcanic lightning, with water and other atmospheric conditions playing supporting roles. However, as research progresses, our understanding might evolve.

Summary & Key Takeaways

• Volcanic lightning is observed during explosive volcanic eruptions that release large ash clouds into the atmosphere.

• The most popular explanation for volcanic lightning is the rubbing of ash particles in the air, similar to the process in regular thunderstorms.

• Some scientists suggest that water in the volcanic clouds may also contribute to the occurrence of volcanic lightning.