Qualla: 2023 Stenungsund Landslide

2023 Stenungsund Landslide: Introduction

Tue, 03 Feb 2026 00:00:00 GMT

The seismic station in Tjorn registered something unusual at 1:40 AM on September 23rd, 2023. For nearly a full minute, the earth moved. Not an earthquake, but something almost as destructive: 400 by 600 meters of ground liquefying and sliding away. By the time the shaking stopped, European route E6, the main artery between Gothenburg and Oslo, had been severed. A Burger King's roof had partially collapsed. A gas station lay in ruins. Nine vehicles and a bus sat trapped in a landscape transformed into a scar. The cause was not natural. Someone had put 170,000 tons of dirt where only 50,000 were permitted.

2023 Stenungsund Landslide: Ice Age Legacy

Tue, 03 Feb 2026 00:00:00 GMT

The Scandinavian Peninsula sits on a geological time bomb. Twenty thousand years ago, glacial ice covered the land, pressing it down beneath massive weight. As the ice melted, clay particles flowed into the salt water along the coast, settling into layers that became highly unsta...

2023 Stenungsund Landslide: Warnings Unheeded

Tue, 03 Feb 2026 00:00:00 GMT

The ground at Stenungsund had been telling its story for years. In 2013, engineering firm Norconsult surveyed the area and found the soil near the E6 to be sensitive. In 2020, the Vastra Gotaland County administrative board warned Stenungsund municipality that the land was unsuit...

2023 Stenungsund Landslide: A Highway Interrupted

Tue, 03 Feb 2026 00:00:00 GMT

The E6 stretches 3,056 kilometers from Kirkenes on Norway's Russian border to Trelleborg in southern Sweden. Twenty thousand vehicles traveled this section daily. After the landslide, that traffic had to go somewhere. Local road O650 through the village of Ucklum suddenly carried...

2023 Stenungsund Landslide: Rebuilding on Glass

Tue, 03 Feb 2026 00:00:00 GMT

Engineers found a novel solution to prevent future instability. They placed a layer of crushed, recycled glass several meters deep beneath the rebuilt roadway, improving drainage and reducing the load on the sensitive clay below. On July 3rd, 2024, King Carl XVI Gustaf, Infrastru...