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Fumarolic clouds mark the Valley of Desolation and Boiling Lake thermal areas, NE of Morne Watt (Watt Mountain) volcano in SE Dominica. A major eruption from Morne Watt produced pyroclastic flows about 930 years ago. The only historical eruptions on the island of Dominica were a moderately large phreatic explosion at the Valley of Desolation thermal area in 1880 and a smaller phre

Fumarolic clouds mark the Valley of Desolation and Boiling Lake thermal areas, NE of Morne Watt (Watt Mountain) volcano in SE Dominica. A major eruption from Morne Watt produced pyroclastic flows about 930 years ago. The only historical eruptions on the island of Dominica were a moderately large phreatic explosion at the Valley of Desolation thermal area in 1880 and a smaller phre

USA Alaska Volcano KASATOCHI Kasatochi Volcano před a po erupci ze dne 7. srpna 2008

USA Alaska Volcano KASATOCHI Kasatochi Volcano před a po erupci ze dne 7. srpna 2008

A pyroclastic flow sweeps down the SE flank of Mayon volcano in the Philippines on September 24, 1984. A thick column of ash rises above the surface of the moving pyroclastic flow, which was the largest of a series of pyroclastic flows that occurred during an eruption that began on September 9. Flow velocities of 50 m/sec were estimated from timed 35-mm photographs. The pyroclastic flow traveled 7 km from the summit vent

A pyroclastic flow sweeps down the SE flank of Mayon volcano in the Philippines on September 24, 1984. A thick column of ash rises above the surface of the moving pyroclastic flow, which was the largest of a series of pyroclastic flows that occurred during an eruption that began on September 9. Flow velocities of 50 m/sec were estimated from timed 35-mm photographs. The pyroclastic flow traveled 7 km from the summit vent

An aerial view shows the terminous of the Lava Park lava flow, erupted from a vent on the flank of Shastina lava dome on the NW flank of Mount Shasta about 9300 years ago. The blocky basaltic-andesite flow is about 6 km long and 110 m thick at its snout. The lava flow overlies a wide apron of pyroclastic-flow deposits erupted from Mount Shasta about 9700 years ago. The area shown is about 2000 m wide. The broad line crossing the photo near the bottom is Highway 97.

An aerial view shows the terminous of the Lava Park lava flow, erupted from a vent on the flank of Shastina lava dome on the NW flank of Mount Shasta about 9300 years ago. The blocky basaltic-andesite flow is about 6 km long and 110 m thick at its snout. The lava flow overlies a wide apron of pyroclastic-flow deposits erupted from Mount Shasta about 9700 years ago. The area shown is about 2000 m wide. The broad line crossing the photo near the bottom is Highway 97.

A diffuse ash column rises above the summit of Soufrière Hills volcano on April 2, 1997. The prominent delta seen in this aerial view from the NE was created by pyroclastic flows that descended to the eastern coast down the Tar River valley. The pyroclastic flows were produced by periodic collapse of a lava dome growing in the summit crater, which is breached to the east. The eruption began in July 1995

A diffuse ash column rises above the summit of Soufrière Hills volcano on April 2, 1997. The prominent delta seen in this aerial view from the NE was created by pyroclastic flows that descended to the eastern coast down the Tar River valley. The pyroclastic flows were produced by periodic collapse of a lava dome growing in the summit crater, which is breached to the east. The eruption began in July 1995

Erosional dissection of an ash deposit at Pinatubo volcano in the Philippines created this intricate pattern. The thin, fine-grained ash deposit at the surface was produced by secondary explosions in still-hot pyroclastic-flow deposits from the devastating eruptions of June 15, 1991. This photo was taken on November 27, 1991, along the Maruanot River valley NW of Pinatubo.

Erosional dissection of an ash deposit at Pinatubo volcano in the Philippines created this intricate pattern. The thin, fine-grained ash deposit at the surface was produced by secondary explosions in still-hot pyroclastic-flow deposits from the devastating eruptions of June 15, 1991. This photo was taken on November 27, 1991, along the Maruanot River valley NW of Pinatubo.

Light-colored pyroclastic-flow deposits below the growing Fugen-dake lava dome dominate this September 11, 1992, aerial view from the east. Explosive activity beginning in November 1990 preceded growth of a lava dome that began in May 1991. Dome growth, accompanied by pyroclastic flows, continued until February 1995. This caused long-term disruption for villages and towns on the outskirts of Shimabara City, in the foreground.

Light-colored pyroclastic-flow deposits below the growing Fugen-dake lava dome dominate this September 11, 1992, aerial view from the east. Explosive activity beginning in November 1990 preceded growth of a lava dome that began in May 1991. Dome growth, accompanied by pyroclastic flows, continued until February 1995. This caused long-term disruption for villages and towns on the outskirts of Shimabara City, in the foreground.

Merapi (left) and Merbabu (right) volcanoes tower above the lowlands between the cities of Yogjakarta and Surakarta (Solo) in this aerial view from the SE. Both 3145-m-high Merbabu and 2911-m-high Merapi have erupted during historical time, but Merapi is by far the more vigorous of the two. A growing lava dome in the summit crater frequently collapses, producing pyroclastic flows and lahars that sweep down the steep slopes of the volcano, often with catastrophic results.

Merapi (left) and Merbabu (right) volcanoes tower above the lowlands between the cities of Yogjakarta and Surakarta (Solo) in this aerial view from the SE. Both 3145-m-high Merbabu and 2911-m-high Merapi have erupted during historical time, but Merapi is by far the more vigorous of the two. A growing lava dome in the summit crater frequently collapses, producing pyroclastic flows and lahars that sweep down the steep slopes of the volcano, often with catastrophic results.

Ash clouds rise above a pyroclastic flow traveling down the Buang valley on the upper NW flank of Mayon volcano in the Philippines on September 12, 1984. The toe of the advancing pyroclastic flow is visible at the lower right. These pyroclastic flows traveled down to 100 m elevation at rates of about 20 m/sec.

Ash clouds rise above a pyroclastic flow traveling down the Buang valley on the upper NW flank of Mayon volcano in the Philippines on September 12, 1984. The toe of the advancing pyroclastic flow is visible at the lower right. These pyroclastic flows traveled down to 100 m elevation at rates of about 20 m/sec.

Snow-capped Mount Ararat is seen from the Khor Virap monastery in Armenia. The 5165-m-high Ararat, also known as Agri Dagi, is Turkey's highest and easternmost volcano, lying near the border with Armenia. Ararat appears to have been active during the 3rd millennium BCE; pyroclastic-flow deposits overlie early Bronze Age artifacts and human remains. A phreatic eruption and pyroclastic flow may have occurred at the time of a July 1840 earthquake and landslide.

Snow-capped Mount Ararat is seen from the Khor Virap monastery in Armenia. The 5165-m-high Ararat, also known as Agri Dagi, is Turkey's highest and easternmost volcano, lying near the border with Armenia. Ararat appears to have been active during the 3rd millennium BCE; pyroclastic-flow deposits overlie early Bronze Age artifacts and human remains. A phreatic eruption and pyroclastic flow may have occurred at the time of a July 1840 earthquake and landslide.

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