In recent months, volcanoes across multiple regions have shown increased activity, drawing attention from scientists and prompting questions about whether the planet is entering a more restless phase. Several volcanoes that had been quiet for long periods have erupted, while others have intensified their ongoing activity.

One of the more notable events was the eruption of Hale Goby in Ethiopia, a shield volcano that had remained dormant for roughly 12,000 years. On November 23, 2025, it erupted explosively, sending ash and gas plumes about 14 kilometers into the atmosphere. Satellite data tracked the sulfur dioxide and ash drifting across the Red Sea toward Yemen, Oman, and parts of Asia. The eruption did not cause confirmed casualties, but it covered nearby villages in ash and forced flight cancellations. The event has been cited as a reminder that long-dormant volcanoes can reawaken without much warning.

In Indonesia, Mount Semeru, the highest peak on Java, erupted on November 19, 2025. Authorities raised the alert level to its highest point after a series of explosive events sent ash, rock, and volcanic gas down its slopes. Hot material traveled up to seven kilometers from the summit, and an ash column rose roughly two kilometers above the Lumajang district. In the following week, monitoring agencies recorded dozens of additional eruptive events, with ash plumes rising on a near-daily basis.

On November 25, 2025, Kilauea in Hawaii began a new eruptive episode, with lava fountains reaching about 120 meters from its crater vent. The activity remained confined within the national park, but the visible fountains and increased volcanic tremor highlighted how even closely monitored volcanoes can shift suddenly.

In Russia’s Kamchatka Peninsula, Bezymianny erupted explosively on November 26, 2025, sending ash about 37,000 feet into the atmosphere and prompting aviation warnings. The event underscored the volatility of subduction zone volcanoes in tectonically active regions. In the Andes, on the border of Chile and Argentina, the Planchón-Peteroa volcanic complex entered a new eruptive phase in late October and early November 2025, emitting continuous gas and ash plumes reaching 15,000 feet.

Scientists point to several factors that may explain the broad uptick in activity. Tectonic stress is one driver. Several major plate boundaries have experienced unusual patterns of strain and seismicity, particularly along the Pacific Ring of Fire, where major earthquakes have occurred in Alaska, Japan, and the Southwest Pacific. Large earthquakes along subduction zones can alter stress distribution within volcanic arcs, potentially pressurizing magma reservoirs and setting the stage for eruptions months or years later.

The East African Rift, which runs through Ethiopia, Kenya, Tanzania, and Mozambique, has also shown signs of accelerating tectonic divergence. Along its length, dozens of volcanoes, many of them poorly monitored, have exhibited increased fumarolic activity, deformation, and seismic swarms. Even mid-ocean ridges, which typically produce quiet submarine eruptions, have shown unusual tremor sequences linked to magmatic movement.

Climate change may also play a role. Many volcanoes in Iceland, Alaska, the Andes, and Antarctica sit beneath or beside glaciers that exert pressure on the crust. When glaciers melt, the reduced pressure can allow molten rock to ascend more easily, a process known as glacial unloading. Iceland is frequently cited as an example, with models predicting that volcanic activity could increase as its glaciers retreat. Historical evidence supports this connection; the end of the last ice age coincided with a surge in eruptive activity as ice sheets collapsed.

The reactivation of long-dormant volcanoes presents particular challenges. These systems can build pressure over thousands of years, and their long quiet periods mean scientists often lack detailed eruption histories, making forecasting difficult. The eruption of Hale Goby, which occurred in a populated region with limited monitoring infrastructure, is one such case. Several Indonesian and Philippine volcanoes that had been dormant for centuries have also shown renewed unrest.

The recent pattern reflects a combination of internal magmatic cycles, shifting tectonic stresses, climate-driven environmental changes, and improved monitoring capabilities. Some volcanoes are erupting more frequently, some are erupting more explosively, and some dormant systems are waking for the first time in thousands of years. Scientists anticipate that the coming decades may see continued elevated volcanic activity, particularly in regions where glacial melt is accelerating, such as Iceland, Alaska, and Antarctica. The Pacific Ring of Fire, which contains many of the planet’s most explosive volcanoes, also shows no signs of quieting.

While eruptions cannot be prevented, preparation remains possible. Expanded satellite coverage, broader seismic networks, improved hazard models, and international cooperation are expected to play key roles in managing the risks associated with a period of heightened volcanic activity.