Soufriere Hills : MONTSERRAT
The Soufriere Hills volcano (French for "Sulphur" Hills) is an active complex stratovolcano with many lava domes forming its summit on the Caribbean island of Montserrat. After a long period of dormancy, it became active in 1995 and has continued to erupt ever since. The volcano is andesitic in nature and the current pattern of activity includes periods of dome growth punctuated by brief episodes of dome collapse which result in pyroclastic flows, ash venting and explosive eruption. The Soufrière Hills volcano (French "Sulphur" Hills) is an active complex stratovolcano with many lava domes forming its summit on the Caribbean island of Montserrat. After a long period of dormancy it became active in 1995, and has continued to erupt ever since. Its eruptions have rendered more than half of Montserrat uninhabitable, destroying the capital city, Plymouth, and causing widespread evacuations: about two thirds of the population left the island. Seismic activity had occurred in 1897–1898, 1933–1937, and again in 1966–1967, but the eruption that began on July 18, 1995 was the first since the 17th century.[2] When pyroclastic flows and mudflows began occurring regularly, Plymouth (the capital city) was evacuated, and a few weeks later a pyroclastic flow covered the city in several metres of debris. A large eruption on June 25, 1997 resulted in the deaths of nineteen people. The island's airport was directly in the path of the main pyroclastic flow and was completely destroyed.[3] Montserrat's tourist industry was also destroyed. However, it is now regenerating. The governments of the United Kingdom and Montserrat led the aid effort, including a £41 million package provided to the people of Montserrat; however, riots followed as the people protested that the British Government was not doing enough to aid relief.
The volcano is andesitic in nature and the current pattern of activity includes periods of dome growth, punctuated by brief episodes of dome collapse which result in pyroclastic flows, ash venting, and explosive eruption. On December 24, 2006, streaks of red from the pyroclastic flows became visible. On January 8, 2007, an evacuation order was issued for areas in the Lower Belham Valley, impacting an additional 100 persons. There was an explosive eruption at Soufriere Hills Volcano starting at 11:27 pm local time on Monday 28 July 2008 without any precursory activity. Pyroclastic Flow lobes reached Plymouth. These involved juvenile material originating from collapse of the eruption column. Further, a small part of the eastern side of the lava dome collapsed generating a pyroclastic flow in Tar River Valley. Several large explosions were registered, with the largest at approximately 11:38 pm. The height of the ash column was estimated at 12 kilometres (40,000 feet) above sea level The volcano has become one of the most closely monitored volcanoes in the world since its eruption began, with the Montserrat Volcano Observatory taking detailed measurements and reporting on its activity to the government and population of Montserrat. The observatory is operated by the British Geological Survey under contract to the Government of Montserrat.
Findings published in the October 9, 2008 issue of the journal Science suggest that two interconnected magma chambers lie beneath the surface of the volcano on Montserrat – one six kilometers below the surface and the other at 12 kilometers below the surface. They also show a link between surface behavior and the size of the deeper magma chamber.The airport destroyed by the eruption of The Soufrière Hills Volcano Soufrière Hills is also the namesake of the Jimmy Buffett song "Volcano".
The complex, dominantly andesitic Soufrière Hills volcano occupies the southern half of the island of Montserrat. The summit area consists primarily of a series of lava domes emplaced along an ESE-trending zone. English's Crater, a 1-km-wide crater breached widely to the east, was formed during an eruption about 4000 years ago in which the summit collapsed, producing a large submarine debris avalanche. Block-and-ash flow and surge deposits associated with dome growth predominate in flank deposits at Soufrière Hills. Non-eruptive seismic swarms occurred at 30-year intervals in the 20th century, but with the exception of a 17th-century eruption that produced the Castle Peak lava dome, no historical eruptions were recorded on Montserrat until 1995. Long-term small-to-moderate ash eruptions beginning in that year were later accompanied by lava-dome growth and pyroclastic flows that forced evacuation of the southern half of the island and ultimately destroyed the capital city of Plymouth, causing major social and economic disruption.
The volcano is andesitic in nature and the current pattern of activity includes periods of dome growth, punctuated by brief episodes of dome collapse which result in pyroclastic flows, ash venting, and explosive eruption. On December 24, 2006, streaks of red from the pyroclastic flows became visible. On January 8, 2007, an evacuation order was issued for areas in the Lower Belham Valley, impacting an additional 100 persons. There was an explosive eruption at Soufriere Hills Volcano starting at 11:27 pm local time on Monday 28 July 2008 without any precursory activity. Pyroclastic Flow lobes reached Plymouth. These involved juvenile material originating from collapse of the eruption column. Further, a small part of the eastern side of the lava dome collapsed generating a pyroclastic flow in Tar River Valley. Several large explosions were registered, with the largest at approximately 11:38 pm. The height of the ash column was estimated at 12 kilometres (40,000 feet) above sea level The volcano has become one of the most closely monitored volcanoes in the world since its eruption began, with the Montserrat Volcano Observatory taking detailed measurements and reporting on its activity to the government and population of Montserrat. The observatory is operated by the British Geological Survey under contract to the Government of Montserrat.
Findings published in the October 9, 2008 issue of the journal Science suggest that two interconnected magma chambers lie beneath the surface of the volcano on Montserrat – one six kilometers below the surface and the other at 12 kilometers below the surface. They also show a link between surface behavior and the size of the deeper magma chamber.The airport destroyed by the eruption of The Soufrière Hills Volcano Soufrière Hills is also the namesake of the Jimmy Buffett song "Volcano".
The complex, dominantly andesitic Soufrière Hills volcano occupies the southern half of the island of Montserrat. The summit area consists primarily of a series of lava domes emplaced along an ESE-trending zone. English's Crater, a 1-km-wide crater breached widely to the east, was formed during an eruption about 4000 years ago in which the summit collapsed, producing a large submarine debris avalanche. Block-and-ash flow and surge deposits associated with dome growth predominate in flank deposits at Soufrière Hills. Non-eruptive seismic swarms occurred at 30-year intervals in the 20th century, but with the exception of a 17th-century eruption that produced the Castle Peak lava dome, no historical eruptions were recorded on Montserrat until 1995. Long-term small-to-moderate ash eruptions beginning in that year were later accompanied by lava-dome growth and pyroclastic flows that forced evacuation of the southern half of the island and ultimately destroyed the capital city of Plymouth, causing major social and economic disruption.
