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Geologist explains science of landslides in Southeast Alaska

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Geologist explains science of landslides in Southeast Alaska


KETCHIKAN, Alaska (KTUU) – Geologists with the State of Alaska are currently in Ketchikan researching slope conditions in an effort to ensure the area is safe before looking into the actual cause of Sunday’s deadly landslide.

“When talking about this, it’s really difficult to imagine what the residents are going through, and our thoughts are really with the families impacted by the recent landslide,” Dr. Gabriel Wolken, the manager of the climate and hazards program with the Alaska division of geological and geophysical surveys, said on Wednesday.

Wolken is also a research professor at the University of Alaska Fairbanks.

“[Geologists are] making sure that the area is safe for the responders and the people trying to put their lives back together. And then soon after this, we will thoroughly analyze the information and the data that are being collected by the geoscientists on the ground, and come up with some causal mechanisms for this event.”

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Ketchikan Landslide Drone Footage

While not sure of the root cause of the landslide — which claimed the life of 42-year-old Sean Griffin — Wolken says that landslides are nearly impossible to predict.

Wolken said geoscientists are gaining a better understanding of what conditions need to be present in order for landslides to occur.

“One thing that is certain is that extreme weather can play a large role in how landslides develop, and intense, prolonged rainfall can play a really large role in this. It can weaken the stability of the slopes,” Wolken said. “This is especially true if the slope’s already saturated, [rainfall] can change the condition of the soil, causing the pore pressure in the soil to increase, which really weakens the stability of the slope. So whenever there’s a lot of rain, a lot of extreme weather, then that can be problematic.”

Wolken says there are warning signs that a landslide is imminent, particularly in Southeast Alaska, where people can keep an eye out for springs in the soil.

That, he says, is an indication the soil is quite saturated. New cracks in the ground or unusual bulges are something to watch out for as well.

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“Another thing to keep a lookout for is any precursor indications that movement is occurring, perhaps in a creep fashion,” Wolken explained. “So if you’re in your house, you might notice that there’s cracks that have developed in the drywall or plaster — if you have that in your house — or maybe the door is not closing properly.

“These are all indications that things are kind of changing in the structure of the house, and those are things to look out for in the event that a slow creep might be occurring on the slope.”

Wolken is leading a study on landslide hazards in Haines, 364 miles northwest of Ketchikan. The project is analyzing data from the spring of 2021, taken one year after a deadly landslide claimed two lives.

“There have been too many destructive and deadly events, resulting in 12 fatalities in the last decade,” he said. “So determining whether landslides in Southeast Alaska are occurring more frequently in recent years than in the past is very difficult, if not impossible, to answer at this time.”

He says it’s difficult to determine if landslides are happening more frequently because of a lack of data, as well as inconsistencies in landslide reporting. He explained that the research in Haines is ongoing and reports are currently being prepped.

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That’s the work that’s happening now. Scientists and geologists are collecting data that will provide future generations with a better understanding of why these landslides occur.

“Our work is really aimed at generating the actionable science that is needed to improve decision-making across the state, across multiple sectors of society,” Wolken said. “And this doesn’t stop at one landslide. This doesn’t stop at one location of the state.

“So we’re really focused broadly on a statewide landslide hazard preparedness, which means that we’re focused on lots of different places at a single time to try to understand, characterize and assess these different places.”

The work now is happening in Ketchikan, as people like geologist Martin “Mort” Larson are collecting data.

“They’re very busy on the ground, going to different places in the high elevation terrain, looking for different signatures on the landscape that would indicate unstable slope conditions, and that can vary across the board, but certainly looking at saturated ground issues, any scarps that are on the landscape, and doing some preliminary mapping of the area,” Wolken said. “We have deployed personnel to the area to work with our partners from both state and federal agencies. I know that the Department of Transportation is collecting some airborne drone-based remote sensing that’s helping with the folks on the ground in a rapid response sort of way, we have deployed a remote sensing specialist to go down and collect some broader Lidar of the area so that we can use that in our analysis.”

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Alaska

101-year-old woman shares her birthday reflections with Alaska’s News Source

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101-year-old woman shares her birthday reflections with Alaska’s News Source


ANCHORAGE, Alaska (KTUU) – Norma Aldefer didn’t expect to turn 100. Now, one day after her 101st birthday, she’s even more surprised.

Inside her pristine apartment, Aldefer’s table is full of cards wishing her a happy birthday. She points out a favorite, which reads “You’re how old?”

Celebratory messages from loved ones, along with congratulations from state officials Senator Lisa Murkowski and Governor Mike Dunleavy. Aldefer said last year’s centennial birthday even brought in regards from President Joe Biden.

Aldefer moved to Alaska to marry her husband, who was originally from her hometown. The photograph she has at her side is of her as a younger woman posing with her mother in 1948.

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Norma and her parents pose “all dressed up” for family photos.(Olivia Nordyke)

“We took pictures of ourselves and and I’m all dressed up in high heels and a hat and a purse. And my little bag that I was carrying.” Aldefer said she was scared leaving the small farm she grew up on, but by working as a telephone operator for Southwestern Bell, she expanded her horizons.

Multiple times Aldefer stated she’s remained curious all her years. She said it’s the reason she’s been able to maintain herself rather than losing her faculties, and believes it’s the way to feel fulfilled.

“Sometimes people get into things they don’t enjoy, but they think, ‘Oh, I have to make a living.’ Don’t do that. If you’re not comfortable, go do something else,” Aldefer said.

“May not make a good living for a while, but you might enjoy life.”

Aldefer says she still enjoys life, and continues to enjoy a nightly martini alongside cheese and crackers before she begins to cook dinner.

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Over the course of the interview, she marveled at her gratitude for her world – calling herself blessed.

“I know I’m not going to be here much probably much longer, but I’ve had such a good life, you know. I’m not afraid of it.”

See a spelling or grammar error? Report it to web@ktuu.com



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Moderate earthquake strikes south-central Alaska

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Moderate earthquake strikes south-central Alaska


ANCHORAGE, Alaska (KTUU) – A moderate earthquake occurred in south-central Alaska Sunday afternoon, striking at 2:42 p.m.

Its epicenter was located about 24 miles due east of Anchorage with a depth of 18 miles.

No damage or injuries were reported.

See a spelling or grammar error? Report it to web@ktuu.com

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OPINION: CDQ program and pollock fishery are essential to Western Alaska

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OPINION: CDQ program and pollock fishery are essential to Western Alaska


By Eric Deakin, Ragnar Alstrom and Michael Link

Updated: 1 hour ago Published: 1 hour ago

We work every day to support Alaska’s rural communities through the Community Development Quota (CDQ) program and have seen firsthand the lifeline the program provides to our state’s most isolated and economically vulnerable areas.

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This program is one of the most successful social justice programs in the United States, giving rural, coastal communities a stake in the success of the Bering Sea fisheries, and transferring these benefits into community investments. Our fisheries participation provides $80 million to $100 million of programs, wages and benefits into Western Alaska annually, and the full economic reach of the CDQ program is substantially larger when accounting for jobs and support services statewide.

In some communities, CDQs are the largest and only private-sector employer; the only market for small-boat fishermen; the only nonfederal funding available for critical infrastructure projects; and an essential program provider for local subsistence and commercial fishing access. There is no replacement for the CDQ program, and harm to it would come at a severe cost. As one resident framed it, CDQ is to Western Alaska communities, what oil is to Alaska.

Consistent with their statutory mandate, CDQ groups have increased their fisheries investments, and their 65 member communities are now major players in the Bering Sea. The foundation of the program is the Bering Sea pollock fishery, 30% of which is owned by CDQ groups. We invest in pollock because it remains one of the most sustainably managed fisheries in the world, backed by rigorous science, with independent observers on every vessel, ensuring that bycatch is carefully monitored and minimized.

We also invest in pollock because the industry is committed to constantly improving and responding to new challenges. We understand the impact that salmon collapses are having on culture and food security in Western Alaska communities. Working with industry partners, we have reduced chinook bycatch to historically low levels and achieved more than an 80% reduction in chum bycatch over the past three years. This is a clear demonstration that CDQ groups and industry are taking the dire salmon situation seriously, despite science that shows bycatch reductions will have very minimal, if any, positive impact on subsistence access.

The effects of recent warm summers on the Bering Sea ecosystem have been well documented by science. This has caused some species to prosper, like sablefish and Bristol Bay sockeye salmon, while others have been negatively impacted, including several species of crab and salmon. Adding to these challenges is the unregulated and growing hatchery production of chum salmon in Russia and Asia, which is competing for limited resources in the Bering Sea, and increasing management challenges.

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Attributing the current salmon crises to this fishery is misguided and could cause unnecessary harm to CDQ communities. Without the pollock fishery, we would see dramatic increases in the cost of food, fuel and other goods that are shipped to rural Alaska. We would also see the collapse of the CDQ program and all that it provides, including a wide array of projects and jobs that help keep families fed and children in school.

The challenges Alaska faces are significant, and to address them we need to collectively work together to mitigate the impacts of warming oceans on our fisheries, build resiliency in our communities and fishery management, and continue to improve practices to minimize fishing impacts. We must also recognize the vital need for the types of community investments and job opportunities that the CDQ program creates for Western Alaska and ensure these benefits are considered when talking about the Bering Sea pollock fishery.

Eric Deakin is chief executive officer of the Coastal Villages Region Fund.

Ragnar Alstrom is executive director of the Yukon Delta Fisheries Development Association.

Michael Link is president and CEO of Bristol Bay Economic Development Corp.

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The views expressed here are the writer’s and are not necessarily endorsed by the Anchorage Daily News, which welcomes a broad range of viewpoints. To submit a piece for consideration, email commentary(at)adn.com. Send submissions shorter than 200 words to letters@adn.com or click here to submit via any web browser. Read our full guidelines for letters and commentaries here.





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