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Volcanoes and Volcanic Eruptions


What is a Volcano?

A volcano is a vent in Earth's surface through which magma, gas, and ash can escape. The name is also used for conical structures of erupted material built up around the vent. Evidence of past volcanic activity is found on most planets and many moons in our solar system.

Volcanic Hazards
Volcanic Hazards
Volcanic Hazards Lava, pyroclastic density currents, lahars, gases and more.
St. Helens - 30 Years
Mount St. Helens - 30 Years
Mount St. Helens - 30 Years Two USGS videos review the eruption and its impact.
Volcanoes
Solar System Volcanoes
Solar System Volcanoes occur on Earth and moons of Jupiter, Saturn and Neptune.
Yellowstone Caldera
Yellowstone Caldera
Yellowstone Supervolcano Three USGS videos explain the history and eruptive activity.
Dangerous Volcano
Mount Rainier
Mount Rainier A dangerous volcano with a history of deadly lahars and pyroclastic flows.
Mount Vesuvius
Mount Vesuvius
Mount Vesuvius Geology, history, maps, facts and more about Vesuvius Volcano.
Mount Etna
Mount Etna
Mount Etna The most active volcano in Europe, continues an eruption that started in 2001.
Blue Flames
blue flames
Blue Flames and the largest highly acidic lake in the world at Kawah Ijen Volcano.
Igneous Rocks
Igneous Rocks
Igneous Rocks Descriptions and photos of common igneous rocks.
Largest Volcano
Largest Volcanoes
Largest Volcano - That title is shared by Tamu Massif, Mauna Kea and Ojos del Salado.
Igneous and Volcanic
igneous and volcanic features
Igneous and Volcanic Features an introduction to how these rocks occur below and above ground.
Geology Tools
Geology Tools
Geology Tools - Hammers, field bags, hand lenses, maps, hardness picks, gold pans.
Arenal Volcano
Arenal Volcano
Arenal Volcano Geology, history, hazards, plate tectonics and more.
Great Rift Valley
Great Rift Valley
The East Africa Rift System Volcanics and tectonics of this active rift system.
Teaching Tectonics
Teaching Tectonics
Teaching Plate Tectonics Students enjoy learning with easy-to-draw illustrations.
Santa Maria Volcano
Santa Maria Volcano
Santa Maria A volcano in Guatemala. Produced one of the largest eruptions of the 1900s.
Types Of Eruptions
Types Of Eruptions
Types of Volcanic Eruptions A description of the most common eruption types.
Helenite
Helenite
Helenite is a man-made glass produced by fusing ash from the 1980 Mount St. Helens eruption.
Volcanic Ash
Volcanic Ash
Volcanic Ash Learn about volcanic ash, volcanic dust and their impacts.
Hawaiian Hot Spot
Hawaiian Hot Spot
How did the Hawaiian Islands Form? The power of a moving plate over a stationary hot spot.
Calderas
Calderas
Calderas are large volcanic craters formed by some of Earth\'s largest eruptions.
Stromboli Volcano
Stromboli Volcano
Stromboli Volcano Geology, history, maps, plate tectonics and more.
Eruption Photos
Eruption Photos
Spectacular Eruption Photos A collection of volcanic eruption photos by USGS, NASA, NOAA.
Mars Volcano
Olympus Mons
Olympus Mons The largest volcano in the solar system is on Mars.
Volcanic Lightning
Volcanic Lightning
Redoubt Volcano Lightning Photographs of lightning in the Redoubt Volcano ash cloud.
Novarupta
Novarupta
The most powerful eruption of the 20th century was initially blamed on the wrong volcano.
Gifts That Rock
Gifts That Rock
Gifts That Rock - What are the most popular gift items in the jpum.net store?
Chaiten Volcano
Chaiten Volcano
Chaiten Volcano Geology, history and facts about this explosive volcano.
Lunar Rift System
lunar rift system
Lunar Rift System? Gravity maps revise the geologic history of the near side of the Moon.
Mount Cleveland
Mount Cleveland
Mount Cleveland is an active volcano in the Aleutian Islands and a threat to air traffic.
Galeras Volcano
Galeras Volcano
Galeras Volcano The most active volcano in Colombia. Article by Jessica Ball.
Pele*s Hair
Pele*s Hair
Pele*s Hair and Pele*s Tears are two unusual types of lava found at Kilauea and other volcanoes.
Volcanoes on Venus?
Volcanoes on Venus
Volcanoes on Venus? The surface of Venus is covered by lava flows and shield volcanoes.
Kilauea Eruption
Kilauea Eruption
Kilauea Eruption - photos of the 2018 eruption in the East Rift Zone of Kilauea Volcano.
What is a Maar?
What is a Maar?
What is a Maar? The second most common volcanic landscape feature on Earth.
Redoubt Volcano
Redoubt Volcano
Redoubt Facts, history, geology, hazards and plate tectonics of this Alaskan volcano.
Mount Agung
Mount Agung Volcano
Mount Agung is an active and dangerous volcano on the island of Bali, Indonesia.
Pavlof Volcano
Pavlof Volcano
Pavlof Volcano - an active North American volcano and a threat to air traffic.
Lo'ihi Seamount
L�'ihi
The Next Hawaiian Island could be growing in the Pacific Ocean right now. Its name is Lo'ihi.
Volcanic Explosivity
Volcanic Explosivity
Volcanic Explosivity Rating volcanic eruptions based upon the volume of tephra ejected.
Kick 'em Jenny
Kick em Jenny Volcano
Kick 'em Jenny is a submarine volcano and one of the most active on the Caribbean plate.
Dallol Volcano
Dallol Volcano
Dallol Volcano is one of the strangest landscapes on earth - at 269 feet below sea level.