Why This Supervolcano Make California the Most TERRIFYING State

California is hiding one of America’s most closely monitored volcanic systems.

Beneath Mammoth Lakes lies the Long Valley Caldera — the scar of an ancient eruption so powerful it reshaped a huge part of eastern California. But the reason scientists watch it 24/7 isn’t just its past.

In this DiscoverTube investigation, we explore decades of earthquake swarms, ground uplift, volcanic gas emissions and the monitoring network designed to detect any major change beneath the Eastern Sierra.

Long Valley is not preparing for a super-eruption.

But it is still an active volcanic system — and scientists are watching every move.

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