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A lahar travels down a river valley in Guatemala near the Santa Maria volcano, 1989. A lahar (/ ˈ l ɑː h ɑːr /, from Javanese: ꦮ꧀ꦭꦲꦂ) is a violent type of mudflow or debris flow composed of a slurry of pyroclastic material, rocky debris and water.
Nevado del Ruiz has erupted several times since 1985, and continues to threaten up to 500,000 people living along the Combeima, Chinchiná, Coello-Toche, and Guali river valleys. A lahar (or group of lahars) similar in size to the 1985 event might travel as far as 100 km (60 mi) from the volcano and could be triggered by a small eruption.
The 1963 eruption of Irazú Volcano in the Cordillera Volcánica Central was one of the most powerful eruptions in Costa Rica, especially for his destructive lahar.Signs of reactivation began to occur in 1961 in the form of microseisms; previously, several specialists warned that the Irazú Volcano could explode at any time.
At the same time, snow, ice, and several entire glaciers on the volcano melted, forming a series of large lahars (volcanic mudslides) that reached as far as the Columbia River, nearly 50 miles (80 km) to the southwest. Less severe outbursts continued into the next day, only to be followed by other large, but not as destructive, eruptions later ...
The landslide was caused by the 1985 eruption of the volcano Nevado del Ruiz in Armero, Tolima. Volcanic debris mixed with ice to form massive lahars (volcanically induced mudflows, landslides, and debris flows), which rushed into the river valleys below the mountain, killing about 25,000 people and destroying Armero and 13 other villages.
The 1991 eruption of Mount Pinatubo in the Philippines' Luzon Volcanic Arc was the second-largest volcanic eruption of the 20th century, behind only the 1912 eruption of Novarupta in Alaska. Eruptive activity began on April 2 as a series of phreatic explosions from a fissure that opened on the north side of Mount Pinatubo .
Detailed map of Mount Rainier's summit and northeast slope showing upper perimeter of Osceola collapse amphitheater (hachured line) The Osceola Mudflow, also known as the Osceola Lahar, was a debris flow and lahar in the U.S. state of Washington that descended from the summit and northeast slope of Mount Rainier, a volcano in the Cascade Range during a period of eruptions about 5,600 years ago.
The main recent volcanic hazard at Ruapehu is from lahars. Two major lahar paths run through the Whakapapa skifield, and in recent times, lahars have travelled through the ski field in 1969, 1975, 1995, and 2007. [31] [10] An eruption warning system operates in the ski field to warn skiers in the event of another eruption. [73]