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Images of Yellowstone.
Folds in outflow sheets of McDermitt Tuff, from the eruption that formed McDermitt Caldera in Nevada and Oregon about 16.4 million years ago. The folding is called “rheomorphism” and occurred as the hot ash deposit flowed under its own weight shortly after it was deposited over preexisting topographic highs and lows. The texture resembles that of rhyolit
Folds in outflow sheets of McDermitt Tuff, from the eruption that formed McDermitt Caldera in Nevada and Oregon about 16.4 million years ago. The folding is called “rheomorphism” and occurred as the hot ash deposit flowed under its own weight shortly after it was deposited over preexisting topographic highs and lows. The texture resembles that of rhyolit
Schematic illustration showing the 1912 Novarupta eruption in Alaska and the caldera collapse at Mount Katmai, 10.6 km (about 6.6 miles) to the northeast.
Schematic illustration showing the 1912 Novarupta eruption in Alaska and the caldera collapse at Mount Katmai, 10.6 km (about 6.6 miles) to the northeast.
Map of volcanic ashfall. Areas of the United States that once were covered by volcanic ash from Yellowstone's giant eruptions 2 million and 630,000 years ago, compared with ashfall from the 760,000-year-old Long Valley caldera eruptions at Mammoth Lakes, California, and the 1980 eruption of Mount St. Helens, Washington.
Map of volcanic ashfall. Areas of the United States that once were covered by volcanic ash from Yellowstone's giant eruptions 2 million and 630,000 years ago, compared with ashfall from the 760,000-year-old Long Valley caldera eruptions at Mammoth Lakes, California, and the 1980 eruption of Mount St. Helens, Washington.
Excerpt from the Geological Map of the Gardiner 30’ x 60’ Quadrangle, South-Central Montana, by Berg and others (1999), focused on Devil’s Slide (colorful blue-green stripes at center of map excerpt). Full unit description and map available online as Montana Bureau of Miles and Geology Open File No.
Excerpt from the Geological Map of the Gardiner 30’ x 60’ Quadrangle, South-Central Montana, by Berg and others (1999), focused on Devil’s Slide (colorful blue-green stripes at center of map excerpt). Full unit description and map available online as Montana Bureau of Miles and Geology Open File No.
Steam rises above a hot pool at Agua Shuca, one of many thermal areas of the Ahuachapán geothermal field of El Salvador. A sudden hydrothermal explosion at Agua Shuca in October 1990 ejected steam and debris within a 200-m-radius, and about 25 people living adjacent to the thermal area were killed.
Steam rises above a hot pool at Agua Shuca, one of many thermal areas of the Ahuachapán geothermal field of El Salvador. A sudden hydrothermal explosion at Agua Shuca in October 1990 ejected steam and debris within a 200-m-radius, and about 25 people living adjacent to the thermal area were killed.
Yellowstone National Park employees Rick Hutchinson (right) and Jim Peaco (left) guide the specially designed Little Dipper boat into the boiling waters of Grand Prismatic Spring to collect measurements of the temperature and structure of the feature. National Park Service photo by Josh Robbins in 1996.
Yellowstone National Park employees Rick Hutchinson (right) and Jim Peaco (left) guide the specially designed Little Dipper boat into the boiling waters of Grand Prismatic Spring to collect measurements of the temperature and structure of the feature. National Park Service photo by Josh Robbins in 1996.
Queen's Laundry bathhouse, in the Lower Geyser Basin of Yellowstone National Park. Building began under superintendent Philetus Norris in 1881 but was never finished.
Queen's Laundry bathhouse, in the Lower Geyser Basin of Yellowstone National Park. Building began under superintendent Philetus Norris in 1881 but was never finished.
Cross section of the Western Snake River Plain, Idaho.
Cross section of the Western Snake River Plain, Idaho.
A gas plume rises above lava fountains in a lava lake in the summit crater of Nyiragongo volcano on 20 August 1994. USGS photo by Jack Lockwood.
A gas plume rises above lava fountains in a lava lake in the summit crater of Nyiragongo volcano on 20 August 1994. USGS photo by Jack Lockwood.
Geologic map of the Wind River Range from Blackstone, 1993 (The Wind River Range, Wyoming: An Overview. Wyoming Geological Association. Jubilee Anniversary Field Conference Guidebook: Wyoming Geology, Past, Present, and Future. Pg. 121-140).
Geologic map of the Wind River Range from Blackstone, 1993 (The Wind River Range, Wyoming: An Overview. Wyoming Geological Association. Jubilee Anniversary Field Conference Guidebook: Wyoming Geology, Past, Present, and Future. Pg. 121-140).
Photo of a deep-ocean hydrothermal vent system from the East Pacific Rise at 9º39’N latitude and 2550 m (8366 ft) depth showing vigorously venting “black smoker” hydrothermal fluids (329 °C, or 624 °F) that are dark gray to black due to rapid precipitation of iron, copper, and zinc sulfide minerals as the hot water mixes with cold bottom waters.
Photo of a deep-ocean hydrothermal vent system from the East Pacific Rise at 9º39’N latitude and 2550 m (8366 ft) depth showing vigorously venting “black smoker” hydrothermal fluids (329 °C, or 624 °F) that are dark gray to black due to rapid precipitation of iron, copper, and zinc sulfide minerals as the hot water mixes with cold bottom waters.
Color-shaded relief topographic map of the track of the Yellowstone hotspot showing the ages and locations of volcanic fields and faulting patterns which become younger to the northeast. Areas in cooler colors (greens and blues) represent low topographic elevations, whereas warmer colors (oranges and reds) represent high elevations. Adapted from
Color-shaded relief topographic map of the track of the Yellowstone hotspot showing the ages and locations of volcanic fields and faulting patterns which become younger to the northeast. Areas in cooler colors (greens and blues) represent low topographic elevations, whereas warmer colors (oranges and reds) represent high elevations. Adapted from
Porkchop Geyser erupting in August 1989.
Ice cone at Porkchop Geyser in March 1989.
Apollinaris Spring in 1987. The spring was modified in 1925 so that water would flow through pipes to be emitted from a rock wall. Yellowstone National Park photo by Jim Peaco.
Apollinaris Spring in 1987. The spring was modified in 1925 so that water would flow through pipes to be emitted from a rock wall. Yellowstone National Park photo by Jim Peaco.
Muddy thermal discharge (foreground) near Congress Pool (middle ground) in Norris Geyser Basin following the June 30, 1975, magnitude-6 Yellowstone National Park earthquake, NPS photo by Rick Hutchinson.
Muddy thermal discharge (foreground) near Congress Pool (middle ground) in Norris Geyser Basin following the June 30, 1975, magnitude-6 Yellowstone National Park earthquake, NPS photo by Rick Hutchinson.
Morning Glory Pool used to be clear blue in color, as shown in the historic undated photo on the left (National Park Service photo by Rentchler).
Morning Glory Pool used to be clear blue in color, as shown in the historic undated photo on the left (National Park Service photo by Rentchler).
Photo of damage to the Mammoth-Norris highway, just south of Mammoth Hot Springs, caused by the June 30, 1975, magnitude-6 earthquake. Haynes Inc. photo for the Deseret News.
Photo of damage to the Mammoth-Norris highway, just south of Mammoth Hot Springs, caused by the June 30, 1975, magnitude-6 earthquake. Haynes Inc. photo for the Deseret News.
Gibbon River in Gibbon Meadows immediate following the June 30, 1975, magnitude-6 Yellowstone National Park earthquake. The muddy color is due to increased sediment load. NPS photo by Rick Hutchinson.
Gibbon River in Gibbon Meadows immediate following the June 30, 1975, magnitude-6 Yellowstone National Park earthquake. The muddy color is due to increased sediment load. NPS photo by Rick Hutchinson.
Map: Index map showing locations of 1967–1968 research drill holes in Yellowstone National Park. Taken from USGS Bulletin 1967.
Map: Index map showing locations of 1967–1968 research drill holes in Yellowstone National Park. Taken from USGS Bulletin 1967.
Generalized geologic map of the Eocene Absaroka volcanic field (modified from Smedes and Prostka, 1972 and “Geology of Wyoming”).
Generalized geologic map of the Eocene Absaroka volcanic field (modified from Smedes and Prostka, 1972 and “Geology of Wyoming”).