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Encyclopedia > Lahar
Lahar from a March 1982 eruption of Mount St. Helens.
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Lahar from a March 1982 eruption of Mount St. Helens.
 An evacuation Route sign in case of volcanic eruption or lahar.
An evacuation Route sign in case of volcanic eruption or lahar.

A lahar is a type of mudflow composed of pyroclastic material and water that flows down from a volcano, typically along a river valley. Image File history File links Download high resolution version (2976x1901, 1155 KB) USGS photo of Mt. ... Image File history File links Download high resolution version (2976x1901, 1155 KB) USGS photo of Mt. ... Mount St. ... Image File history File linksMetadata Vol. ... Image File history File linksMetadata Vol. ... It has been suggested that this article or section be merged into landslide. ... Pyroclastic rocks are formed from lavas which are ejected into the air, as occur in pyroclastic flows or Plinian eruptions. ... A girl in a swimming pool Water (from the Old English waeter; c. ... A volcano is a geological landform usually generated by the eruption through a planets surface of magma, molten rock welling up from the planets interior. ... The Murray River in Australia. ... Fljótsdalur in East-Iceland A valley is a landform, which can range from a few square miles (square kilometers) to hundreds or even thousands of square miles (square kilometers) in area. ...


Lahars have the consistency of concrete: wet when moving, then solid when stopped. Lahars can be huge: the Osceola lahar produced 5,600 years ago by Mount Rainier in Washington state produced a wall of mud 180 m (600 feet) deep in the White River canyon and extends over an area of over 320 km². Placing a concrete floor for a commercial building. ... Mount Rainier is a stratovolcano located 54 miles (87 km) southeast of Seattle, Washington, in the United States. ... Official language(s) None Capital Olympia Largest city Seattle Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 18th 184,824 km² 385 km 580 km 6. ... The White River in Washington state flows around 75 miles from its headwaters near Mount Rainier to its confluence with the Puyallup River at Sumner. ...


Lahars can be extremely dangerous, because of their energy and speed: large lahars can flow several tens of meters per second, and can flow for many kilometres, causing catastrophic destruction along the way. The lahars from the Nevado del Ruiz eruption in Colombia in 1985 killed an estimated 25,000 people in the city of Armero who were buried under 8 m (26 ft) of mud and debris. The 1953 Tangiwai disaster in New Zealand was caused by a lahar. Nevado del Ruiz is a volcano in Colombia. ... This article is about the year. ... Armero is the name of a city in Colombia that was buried by ash after a nearby volcano erupted, killing about 23,000 people. ... 1953 (MCMLIII) was a common year starting on Thursday (link is to a full 1953 calendar). ... The Tangiwai disaster was the worst rail accident in New Zealand history. ...


Lahars have several possible causes:

Several mountains in the world, including Mount Rainier, Mount Ruapehu in New Zealand, and Galunggung in Indonesia, are considered particularly dangerous due to the risk of lahars. Several towns in the Puyallup River valley in Washington state, including Orting, the closest to Mount Rainier, are built on top of lahar deposits that are only about 500 years old. Lahars are predicted to flow through the valley every 500-1000 years, so Orting, Sumner, Puyallup, Fife, and the Port of Tacoma face considerable risk. The USGS has set up lahar warning sirens in Pierce County, so that people can flee the approaching debris flow. A lahar warning system is also being set up at Mount Ruapehu by the New Zealand Department of Conservation. Snow is precipitation in the form of crystalline water ice, consisting of a multitude of snowflakes. ... Aletsch glacier, Switzerland A glacier is a large, long-lasting river of ice that is formed on land and moves in response to gravity. ... Pyroclastic flows sweep down the flanks of Mayon Volcano, Philippines, in 1984 Pyroclastic flows are a common and devastating result of some volcanic eruptions. ... Look up Flood in Wiktionary, the free dictionary. ... Lake breakout is a geological term that refers to the collapse of a (usually high-altitude) lake. ... A glacier run (literal translation of Icelandic jökulhlaup) is due to the eruption of a volcano under a glacier. ... A glacier run (literal translation of Icelandic jökulhlaup) is due to the eruption of a volcano under a glacier. ... Mount Rainier is a stratovolcano located 54 miles (87 km) southeast of Seattle, Washington, in the United States. ... Mount Ruapehu, or just Ruapehu, is an active stratovolcano, situated at the southern end of the Taupo Volcanic Zone. ... Galunggung (Galoen-gong, Gunung Galunggung) is a stratovolcano on Java, Indonesia. ... The Puyallup River in Pierce County, Washington flows about 45 miles from its source on Mount Rainier to Commencement Bay at Tacoma. ... Orting is a city located in Pierce County, Washington. ... Sumner is a city located in Pierce County, Washington. ... Puyallup (pronounced ) is a city located in Pierce County, Washington. ... Fife is a city located in Pierce County, Washington. ... Old Town neighborhood in Tacoma, with Mount Rainier in background Nickname: The City of Destiny Official website: http://www. ... The United States Geological Survey (USGS) is a scientific agency of the United States government. ... Pierce County is the second most populous county in the state of Washington. ... The Department of Conservation (In Māori, Te Papa Atawhai), commonly known by its acronym, DOC, is the state sector organisation of New Zealand which deals with the conservation of New Zealand’s natural and historic heritage. ...


The term 'lahar' originated in Indonesia.


See also mudflow. It has been suggested that this article or section be merged into landslide. ...


External links

  • USGS web page about lahars
  • Mount Rainier Volcano Lahar Warning System
  • USGS fact sheet - "Mount Rainier -- Learning to Live with Volcanic Risk"

  Results from FactBites:
 
USGS Photo Glossary: Lahar (132 words)
A small lahar triggered by rainfall rushes down the Nima II River near the town of El Palmar in Guatemala.
Lahar is an Indonesian word for a rapidly flowing mixture of rock debris and water that originates on the slopes of a volcano.
Lahars are also referred to as volcanic mudflows or debris flows.
Lahar Summary (755 words)
Lahars triggered by the 1980 eruption of Mount St. Helens traveled at an average velocity of 41.6 mph (67 kph).
Lahars can be huge: the Osceola lahar produced 5,600 years ago by Mount Rainier in Washington produced a wall of mud 180 m (600 feet) deep in the White River canyon and extends over an area of over 320 km².
The 1953 Tangiwai disaster in New Zealand was caused by a lahar.
  More results at FactBites »

 
 

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