Feb 25, 2025 · The world's largest volcano: Mauna Loa, which rises 30,000 feet (9,000 meters) above the seafloor. Number of active volcanoes in the U.S.: 165.

Oct 4, 2024 · Mount Adams is the largest active volcano in Washington state. (Image credit: Google Earth) It last erupted at some point between 3,800 and 7,600 years ago, according to …

Apr 28, 2025 · Uturuncu is a large, dormant volcano that stands at a height of 19,711 feet (6,008 meters) above sea level. It is a stratovolcano, which are large, steep, and cone-shaped …

Mar 18, 2025 · In 1992, volcanic tremor started about three weeks before Mount Spurr erupted. Another nearby volcano that erupted in 2009, Mount Readout, showed volcanic tremor for two …

6 days ago · The USGS has announced that Kilauea volcano is ejecting fountains of lava in a manner not seen since the Pu'u'ō'ō eruption in the 1980s. But while the lava is mesmerizing, …

Dec 30, 2024 · A volcano that hasn't erupted in the Holocene is considered extinct. This geologic-timescale-based distinction is somewhat arbitrary, Ben Kennedy , a volcanologist at the …

4 days ago · 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 …

Jan 2, 2025 · The volcano, known as Axial, is a seamount 300 miles (480 kilometers) west of Cannon Beach, Oregon. The Axial seamount erupts regularly — it rumbled to life in 1998, 2011 …

May 31, 2024 · Europe's awakening Campi Flegrei volcano experienced its biggest seismic swarm in 40 years, with 150 earthquakes rocking the region in southern Italy in the evening of May 20.

6 days ago · A 2024 satellite photo shows four end-to-end volcanoes perfectly spaced out along the Russian island of Simushir. One of these peaks was the site of a surprise eruption that …