Why a reawakened geyser isn't worrying geologists.
The U.S. Geological Survey defines a volcano as a vent in Earth's surface, either on land or on the seafloor, from which molten rock called magma, as well as ash and gases, can erupt or ooze. Different types of volcanoes erupt in different ways, with some erupting spectacularly and others, most notably Hawaii's shield volcanoes, steadily oozing lava. There are different types of volcanoes, including stratovolcanoes, shield volcanoes and cinder cones, and different types of lava and other volcanic flows. Volcanoes can be active, dormant or extinct. Most of Earth's volcanoes are located along the Pacific Ring of Fire, where many of Earth's tectonic plates subduct beneath another plate. Currently volcanic eruptions cannot be predicted, though most of the big, active volcanoes are routinely monitored and authorizes warn when they think an eruption is likely. Read below for the latest news on volcano monitoring and research, current volcanic eruptions and to see amazing pictures of volcanoes.
Hawaii's Kilauea volcano erupted beginning Sunday (Dec. 20) night local time, with dramatic lava fountains and huge puffs of gas and steam being launched from the summit crater called Halema'uma'u.
Six volcanic islands in the Aleutian archipelago may be linked together in one massive caldera hiding underwater.
Volcanoes rank among the most destructive and awe-inspiring phenomena on the planet. But these fiery fissures do much more than just destroy.
An explosion on the slopes of Stromboli sent pyroclastic flow down the Italian volcano on Monday (Nov. 16).
Researchers have designed specially-adapted drones to fly straight into volcanoes and help gather data from an active volcano in Papua New Guinea.
Alaska's Okmok volcano eruption in 43 B.C. had far-reaching impacts on climate in the Mediterranean, leading to famine and social disruption in the Roman Republic.
Scientists used sonar and gravimeters to measure the gargantuan Pūhāhonu volcano in Hawaii — and it's the world's biggest.
A series of 'forgotten' volcanic eruptions could explain accounts of the moon 'vanishing' in A.D. 1110.
A hiker in Hawaii rediscovered evidence of a 1935 attempt to use bombs to redirect a lava flow from Mauna Loa's flank.
The Taal volcano eruption in the Philippines this week sent ash plumes 9 miles (14 kilometers) into the air, new satellite imagery shows.
Taal volcano in the Philippines rumbled to life on Jan. 12, sending steam and sulfur skyward. Satellites have captured images of the eruption.
Taal volcano in the Philippines has erupted, and scientists are worried it could soon erupt even more violently, putting almost a million people at risk.