Some volcanic eruptions are thousands, or even a million times more explosive than others. Volcanic explosivity index: The spheres in the illustration above represent the volume of erupted tephra for some of the most widely-known explosive volcanic eruptions. Although most people believe that Vesuvius (79 AD - the Pompeii eruption), Mount St.
A maar is a volcanic crater that forms when magma contacts groundwater to produce a steam explosion. Ukinrek Maar: Views of East Ukinrek Maar Crater, which formed in April, 1977 during a 10-day eruption. This eruption provided a rare - and the most recent - opportunity for researchers to observe the formation of a maar by volcanic activity.
Article by Jessica Ball Hawaiian Eruption Hawaiian eruption. In a Hawaiian eruption, fluid lava is ejected from a vent as fire fountains or lava flows. The 1969 eruption at Mauna Ulu, a vent of Kilauea Volcano in Hawaii, was a spectacular example of fire fountaining. Photo by D.A. Swanson, USGS, August 22, 1969.
Among the most unusual types of lava Article by: Hobart M. King, Ph.D., RPG Pele's Hair: A cluster of Pele's Hair from Hawaii with a hand lens used for scale. Creative Commons photograph by Cm3826. Click to enlarge. Strange Rocks from Flying Lava The volcanoes of Hawaii produce many spectacular, dangerous and frightening sights.
One of the most active volcanoes in Alaska's Aleutian Island Arc and a threat to international and local air traffic. Mount Cleveland Volcano erupting a plume of ash that is being carried to the west-southwest by wind at an elevation of up to about 6000 meters (about 19,700 feet). This photo was taken by Jeff Williams, an astronaut aboard the International Space Station, on May 23, 2006.
Kilauea maps and photos are from the USGS Hawaiian Volcano Observatory. New Lava Delta New Lava Delta: Lava flows from the Lower East Rift Zone have been entering the ocean along the easternmost coast of the island. Since the beginning of the current eruption cycle in early May, 2018, approximately 875 acres of lava deltas have been built where lava distributary channels fall into the ocean.
Article by Jessica Ball Mount Etna in Eruption at Night Mount Etna night eruption: A night photo of Mount Etna in eruption (2008). Image copyright iStockphoto / Frizi. Mount Etna: Introduction Mount Etna is the highest and most active volcano in Europe. Towering above the city of Catania on the island of Sicily, it has been growing for about 500,000 years and is in the midst of a series of eruptions that began in 2001.
Article by Jessica Ball Picture of Mount Vesuvius and Naples Bay A panorama of the Gulf of Naples, Italy, showing the high population density and commerce. Mt. Vesuvius rests quietly in the background. Image copyright iStockphoto / Danilo Ascione. Mount Vesuvius Introduction Vesuvius is the only active volcano in mainland Europe, and has produced some of the continent's largest volcanic eruptions.
Article by Jessica Ball Picture of Arenal Volcano Arenal Volcano is a conical stratovolcano that stands on the shore of Lake Arenal in northwestern Costa Rica. It is the youngest and most active volcano in the country, and has been in near-constant eruption since 1968. Image copyright iStockphoto / M.
A collection of photos and images that feature volcanic eruptions worldwide Sarychev Volcano: This image of Sarychev Volcano in the early moments of an eruption was captured with a hand-held camera by an astronaut on NASA's International Space Station on June 12, 2009. Sarychev is one of the most active volcanoes in the Kuril Islands of Japan.
Article by Jessica Ball Redoubt: 1990 Eruption Cloud Eruption cloud from Redoubt Volcano as viewed from the Kenai Peninsula. The mushroom-shaped plume rose from avalanches of hot debris (pyroclastic flows) that cascaded down the north flank of the volcano. A smaller, white steam plume rises from the summit crater.
Activity Has Been Observed on Earth and on Moons of Jupiter, Neptune and Saturn Article by: Hobart M. King, Ph.D., RPG Volcanoes on Io: Io, a moon of Jupiter, is the most volcanically active body in our solar system. It has over 100 active volcanic centers, many of which have multiple active vents. Eruptions recurrently resurface large parts of the moon.
One of the world's strangest volcanic landscapes and one of the hottest places on Earth. Located 269 feet below sea level in the Danakil Depression of Ethiopia. Article by: Hobart M. King, Ph.D., RPG Dallol Crater: Mud, salt, iron stains, halophile algae, and hot spring activity produce a colorful but dangerous landscape in the Dallol craters.
Article by Jessica Ball Picture of Galeras Volcano Photograph of Galeras Volcano taken from the community of Pasto, Colombia on December 30, 2005 by José Camilo Martínez. Pasto has a population of over 300,000 people and would be at risk if a major eruption occurred at Galeras. Creative Commons License.
Article by: Hobart M. King, Ph.D., RPG Kick 'em Jenny Volcano Map Kick 'em Jenny Volcano Map: Kick 'em Jenny volcano is located under the ocean's surface about five miles north of the island of Grenada in the Caribbean Sea. Mount Saint Catherine is the closest active volcano to Kick 'em Jenny and is located on the island of Grenada.
The "Yellowstone Supervolcano" produced some of Earth's largest eruptions. Videos featuring Jake Lowenstern, USGS Scientist in Charge of Yellowstone Volcano Observatory - April 16, 2009 USGS Scientist-in-Charge of Yellowstone Volcano Observatory, Jake Lowenstern, explains volcanic features at Yellowstone and answers several interesting questions which include: "How do we know Yellowstone is a volcano?
A volcanic hazard that is often underestimated in its geographic reach and impact. Article by: Hobart M. King, Ph.D., RPG Volcanic ash plume from Cleveland Volcano, located on Chuginadak Island in the Aleutian Island Chain off Alaska. NASA image taken by Jeff Williams, Flight Engineer, from the International Space Station.
Many types of hazards are associated with volcanoes Article by Jessica Ball Lava Flows This is one of several lava streams of the Prince Avenue flow slicing through the forest between the cross streets of Paradise and Orchid. The lava stream is about 3 meters (10 feet) wide. (Kalapana/Royal Gardens, Hawaii).
Volcanoes on Venus: A simulated color image of the surface of Venus created by NASA using radar topography data acquired by the Magellan spacecraft. Enlarged views at 900 x 900 pixels or 4000 x 4000 pixels. Discovery of a Volcanic Landscape Venus is the closest planet to Earth. However, the surface of Venus is obscured by several layers of thick cloud cover.
Article by Jessica Ball Picture of Stromboli A view of the island known as "Stromboli." A plume rises from the volcanic vent with the same name. The island has a population of a few hundred people. This view shows the northeast side of the island where most of their dwellings are located. Image copyright iStockphoto / miralex.
Recounting a 30-year history of eruptions and monitoring Videos released in May 2010 by the United States Geological Survey. Video: United States Geological Survey scientists involved in responding to the 1980 eruption of Mount St. Helens recount their experience, explain the impact of the eruption, its magnitude, and what they learned about volcanoes.