Mount Semeru erupted on Wednesday with pyroclastic flows and seismic tremors. Authorities maintain a Level III Alert.

From USGS Hawaiian Volcano Observatory livestreaming V2cam, a plume-like fountain erupted from the north vent during episode 24 on June 4–5, 2025, creating an elegant arc. With a maximum fountain height of 364 meters (1194 feet), this was the highest fountain observed up until that point. USGS photo.

Mount Etna is Europe’s most active volcano and the continent’s largest. It attracts hikers and backpackers to its slopes, while less adventurous tourists can take it in from a distance, most stunningly from the Ionian Sea.

The Mayon Volcano is exhibiting signs of increasing unrest, with bright red magma and glowing pyroclastic density currents called "uson" continuing to stream from its summit as the lava dome collapses.

Volcano Watch” is a weekly article and activity update written by US Geological Survey Hawaiian Volcano Observatory scientists and affiliates. Often spotted by onlookers in Hawaiʻi Volcanoes National Park,