Redout volcano (Alaska), activity update: plinian to subplinian eruption on April 4th, 2009 After about a week of weak activity, Redoubt exploded again on April 4th. Redoubt Volcano, or Mount Redoubt (Russian: Редаут), is an active stratovolcano in the largely volcanic Aleutian Range of the U.S. state of Alaska.Located at the head of the Chigmit Mountains subrange in Lake Clark National Park and Preserve, the mountain is just west of Cook Inlet, in the Kenai Peninsula Borough about 110 miles (180 km) southwest of Anchorage. Our team member Marco Fulle is on location and reports heavy thunderstorms from below the 15 km tall ash plume. Photo courtesy of the Alaska Volcano Observatory. Photographs showing how a scanning electron microscope reveals the shape and type of ash particles erupted from Redoubt Volcano 12 13. The volcano, which last erupted in 1989, rises to a height of 10,197 feet (3,108 meters) — or seven to seven and a … Photo of ash from Redoubt's 1989 eruption as seen under a microscope. The Mat-Su Valley, Anchorage, Valdez and large … National Oceanic and Atmospheric Administration satellite of Redoubt Volcano in eruption, December 16, 1989 10 12. Info about Redoubt’s last explosive eruption in 1989: “The 1989-90 eruption of Redoubt seriously affected the populace, commerce, and oil production throughout the Cook Inlet region and air traffic as far away as Texas. Predicting what might come includes looking at Redoubt's past. Volcanic Ash. Volcanic ash can pose a myriad of hazards. Plume heights were observed at or above 60,000 feet during two of the six significant eruptions. On March 22, 2009, Mount Redoubt volcano, 106 miles southwest of Anchorage, Alaska, began a series of eruptions after persisting in Orange or “Watch” status since late January 2009. The 1989 eruption of Mount Redoubt wasn't exactly among the largest in Alaska during the 20th century -- the peak activity merited a Volcanic Explosivity Index rating of 3 on a scale of 1-7 -- … In response, the National Weather Service issued a series of ash fall advisories. How tall is Redoubt? Alaska's Mount Redoubt volcano began erupting on March 22, 2009, and activity continued for several months.. During the eruptions, which lasted for several months, reports found ash clouds reaching as high as 65,000 feet (20,000 m) above sea level. It was the largest eruption, during this sequence, and produced the largest lahar to date, completely encircling the Drift River Tank Farm (DRTF). None of the mud or water, however, penetrated the large dikes around the facility. Redoubt Volcano, an ice-covered stratovolcano on the west side of Cook Inlet, erupted in March 2009 after several months of escalating unrest. The last major explosive eruption of Redoubt volcano occurred on April 4. Map, cross section, and diagram of seismicity at Redoubt Volcano, December 13-3 1, 1989 13 14. For example, imagine this - you are aboard a Boeing 747 jumbo jet on December 15, 1989 when it flies into a diffuse ash cloud erupted from Redoubt Volcano. The 2009 eruption of Redoubt Volcano shares many similarities with eruptions documented most recently at Redoubt in 1966–68 and 1989–90.