Transported materials include rock, soil (fine-grained material),
“It is well established that Alaska sees large landslides in the spring, and that their increasing size and frequency is driven by global heating,” Petley wrote. federal government agencies, and the general public. Many coastal areas in Southcentral and Southeast Alaska are susceptible to tsunamis generated by landslides, and history records several such events, including the 1958 Lituya Bay and the 2015 Taan Fjord tsunamis. NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey. By Associated Press August 25, 2015. The researchers said: “Landslides have set off giant waves elsewhere in Alaska and Greenland during the past decade. School was canceled for the day and city officials urged residents to stay indoors and not travel. These landslides resulted in three fatalities and substantial
Petersburg saw over eight and half inches of rain from the storm as of Wednesday. “I know that some locations have set all-time records for the days, for 24 hours. Joshua Huskey said there hasn’t been any catastrophic damage. Landslides in Alaska. According to the experts, the catastrophe can come within the next 12 months or in the coming 20 years. Southeast Alaska is taking a beating from a series of storms bringing high winds and heavy rain. Ketchikan was soaked with about 9.5 inches of rain over the Thanksgiving weekend, according to federal meteorologists. In August 2015 there were more than 60 landslides in and around Sitka after heavy rains inundated the region. A glacier that had held an Alaskan slope in place for centuries is melting, releasing the soil beneath in what can be described as a slow-motion landslide, researchers say. NASA Earth Observatory images by Joshua Stevens, using Landsat data from the U.S. Geological Survey. (Note: The USGS monitoring site on Harbor Mountain should not be confused with the Alaska DNR weather station, also on Harbor Mountain.) We’re still sorting through that trying to come up with all those numbers but we are in the process of doing that and it’s looking like a very wet and unfortunately eventful storm system coming through as we also are seeing a lot of landslides, mudslides and flooding across the area.”, RELATED: As record rains drown Southeast, destruction appears worst in Haines. Many creeks and lakes were at risk of flooding on Wednesday with one to two inches of rain in the forecast through the end of the day. Alaska Division of Geological Geophysical Surveys Landslides cause deaths, injuries, and homelessness every year, and damage or destroy buildings, roads, and other infrastructure. These include the numerous ground failures that resulted from the 1964 Great Alaska Earthquake, which were
There are many examples of landslides that have significantly impacted Alaska. Juneau’s mayor Beth Weldon showed up to help, too. In August 2015 there were more than 60 landslides in and around Sitka after heavy rains inundated the region. KETCHIKAN, Alaska (AP) — A landslide in a city near the southern tip of the Alaska Panhandle demolished the back side of a grocery store. Scientists have found such an unstable slope near Barry Glacier in Alaska, the United States that stands the chance of failing and causing a mega tsunami bringing damage and destruction on a massive scale. All rights reserved. Using imagery from the Landsat 8 satellite, scientists have confirmed that a large landslide occurred in southeastern Alaska on February 16, 2014. Landslides are common in Southeast Alaska and the U.S. Forest service has documented thousands of these features in Tongass National Forest. Sedimentology and geomorphology of a large tsunamigenic landslide, Taan Fiord, Alaska Abstract. Alaska Landslide: Officials Identify Third Body. High winds, flooding and landslides caused moderate to severe damage in communities across Southeast Alaska Wednesday, as an atmospheric river … The drainage water systems have been flooding over the roads. Landslide potential depends on a number of factors, including topography (slope),
“Yeah, we’ve had quite a few landslides here in town, lot of debris in the roads. In 2004, an area of the Alaska Highway near Northway was rerouted because of a slope failure. DGGS is currently involved in a number of landslide assessment and monitoring projects in Alaska, including: Alaska Division of Geological & Geophysical Surveys, Alaska Department of Transportation & Public Facilities, AKDOT&PF's Geotechnical Asset Management Program, Division of Geological & Geophysical Surveys. “In Taan Fiord (Icy Bay, Alaska), a … Frozen debris lobe FDL-A approaching the Dalton Highway in the southern Brooks Range. There is at least one person not accounted for at this time. Landslides in Alaska. Photo from U.S. Coast and Geodetic Survey archives. The main portion of … roads impacted by slope instability and has web sites with information along the state's road system (Unstable Slopes in Alaska; AKDOT&PF's Geotechnical Asset Management Program). And heavy rainfall brought Falls Creek near Petersburg to flood stage on Tuesday — the highest level ever recorded on a stream gauge there. These include the numerous ground failures that resulted from the 1964 Great Alaska Earthquake, which were particularly significant in and around Anchorage. evaluated unstable slopes in a historically problematic area of slope failure along the Richardson Highway south of Glennallen; and investigated alpine-sourced debris flows
For a closer view, Alpine Air Alaska has posted aerial photographs and a video. Heavy rain, high winds and saturated soil bring the potential for landslides, and that’s a particular concern for city officials in the Prince of Wales Island community of Craig. In a normal year, cruise ships carrying up to 4,000 passengers transit Glacier Bay’s steep-walled fjords hundreds of … City and state crews were busy clearing roadways of mud and debris on Wednesday morning. His initial analysis of the seismic data suggested the slide occurred in eastern Alaska and had a mass of about 20 million metric tonnes (22 million tons). For a closer view, Alpine Air Alaska has posted aerial photographs and a video. (Rashah McChesney/KTOO) High winds, flooding and landslides prompted average to extreme injury in communities across Southeast […] As much as she has her eye on rain and wind, Seibert has her eye on this measurement, which is akin to soil moisture, but relevant to landslides. This is a developing story. The ensuing splash reached more than 1,700 feet (530 meters) in height. Landslides in Alaska. rebound are important mechanisms that can trigger devastating landslides. These landslides resulted in three fatalities and … (Photo courtesy of the Alaska State Library historical collection) The City and Borough of Juneau is warning residents to be prepared in case heavy rains and snowmelt cause landslides … With reporting from Erin McKinstry, Jeremy Hsieh, Rashah McChesney, Henry Leasia and Joe Viechnicki. High winds, flooding and landslides caused moderate to severe damage in communities across Southeast Alaska Wednesday, as an atmospheric river stalled over the region and brought record-breaking rain. geology, lithology (rock or sediment type), vegetation, and water. No … Tsunamis caused by submarine (below water) and subaerial (above the water) landslides are a serious hazard in bays and fjords of coastal Alaska, particularly in Southeast and South-central Alaska. There are many examples of landslides that have significantly impacted Alaska. Alaska and landslide tsunamis Alaska is no stranger to landslide-induced tsunamis. Landslide on the west side of the Dalton Highway, south bank of the Yukon River. along the Haines Highway in an area of frequent rock fall. and debris (coarse-grained materials) that move downslope by fall, slide, or flow. Only July 9, 1958, an earthquake triggered a landslide in Lituya Bay, releasing an estimated 40 million cubic yards (30 million cubic meters) of material. On 17 October 2015, a landslide of roughly 60 × 10 6 m 3 occurred at the terminus of Tyndall Glacier in Taan Fiord, southeastern Alaska. “I didn’t really know what to do at first so I went to Home Depot, and they were closed last night, and banged on the door until they let me get some sandbags.”, This storm is one for the record books. On July 25, Stark noted a possible landslide event in southeastern Alaska. A landslide is the down-slope movement of earth material, under the influence of gravity, due to ground failure. Authors: Stevens, D.S.P., Wolken, G.J., Hubbard, T.D., and Hendricks, K.A. On May 14, an Alaska Department of Natural Resources press release and a public letter from 14 scientists warned locals of a possible landslide-generated tsunami. “This is like the first flood that I’ve been a part of,” Morgan said. The Juneau airport saw nearly five inches of rain in a 24-hour period — a new record for daily rainfall. Nearly a foot of rain fell in Pelican over the last 48 hours. Farther south safety concerns at Alaska’s Glacier Bay National Park led to a 2017 report in which geologists described 24 landslides they believe were at least in part climate-related. The downpour inundated low-lying areas around nearby Ward Lake, and 50 mph gusts knocked out power north of town early Tuesday morning. mass movement and evolve into another as material moves downslope. lobes—that are threatening the highway. At the landslide's current elevation, its mass would trigger a tsunami with waves hundreds of feet tall in Barry Arm. One such research conducted by scientists in Alaska, United States, has warned of an impending mega tsunami in the state which can be triggered by a landslide. … No life threatening damage of any sorts.”. On May 14, an Alaska Department of Natural Resources press release and a public letter from 14 scientists warned locals of a possible landslide-generated tsunami. “No major hills — landslides or slides of anything. An open letter signed by 14 scientists with expertise in landslides, tsunamis and climate change warns of an unstable mountain slope above the leading edge of the retreating Barry Glacier in Alaska. Juneau resident Rhett Morgan said about 2-3 inches of water flowed into his garage. It’s under control now, though. Its Port St. Nicholas Road has seen at least four slides since late October — including one on Saturday, Nov. 28 that was cleared the following day. … It’s just wet and crazy,” he said with a laugh. particularly significant in and around Anchorage. The Tatsuda's IGA building in Ketchikan, Alaska was condemned Feb. 27, 2020 after it was struck early Thursday morning by a rockslide. He said his neighbors have been placing the sandbags and diverting water since Tuesday night. Many regions in Alaska are especially prone to landslides. #akwx @KTOOpubmedia @KRBDRadio @ravenradio @KHNS_FM @KFSK1 pic.twitter.com/sKvrlGwjfr. The massive landslide in Lituya Bay, Alaska on July 9, 1958 caused a wave 1,700’ tall to wash away vegetation along the shores of the bay.