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Volcanoes can ground planes, bury towns, and reshape landscapes in hours. With over 850 eruptions since 2015, Earth is constantly reminding us of its raw power, but why does it erupt, and what can we expect next?
What causes an eruption?
Volcanoes act as channels allowing magma (molten rock) to reach Earth’s surface. As magma rises, dissolved gases expand, increasing pressure until the rock breaks. Whether an eruption gently flows or explosively bursts depends on magma viscosity and gas content.
“Volcanic eruptions are really about pressure release. Gas wants to escape, and the magma is its vehicle,” — Dr. Jessica Johnson, volcanologist.
“It’s like shaking a soda bottle and releasing the cap too fast—it blows,” — Dr. Janine Krippner, Smithsonian volcanologist.
Where and how they form?
Most eruptions occur at tectonic plate boundaries, especially subduction zones like the Ring of Fire, or at hotspots such as the Hawaiian Islands. Volcanoes also form along ocean ridges beneath the sea.
Volcanoes types:
“Supervolcanoes like Yellowstone can erupt over 1,000 km³ of material,” said Professor Ray Cas, Monash University.
Major eruptions (2015–2025)
Recorded global eruptions totaled roughly 850+, from minor flows to devastating explosions. Here are the most significant:

Earthquake-triggered volcanism in Russia
Why it matters
Quick facts
850+ eruptions (2015–2025), but only one VEI 5–6 event (Tonga)
Average of 40–50 eruptions daily
Earthquakes can trigger nearby volcanoes if conditions are primed
Indonesia and Kamchatka were hotspots of outbreak activity
Avalanche, ash inhalation, toxic gas, and climate cooling are key impacts
Final word
Volcanoes are critical to understanding Earth’s dynamism, but they are also unpredictable. The 2025 Kamchatka earthquake and subsequent eruption at Krasheninnikov illustrate just how connected the planet’s tectonic systems truly are.
“With seismic activity, you can’t say volcanoes follow a schedule—but you can see the strings connecting them,”
— Dr. Ed Venzke, Smithsonian Institution Global Volcanism Program.
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