A5033843384- Landslides and related hazards
- Cryospheric studies and observations
- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Geological Studies and Exploration
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Geological Modeling and Analysis
- Geochemistry and Geologic Mapping
- Planetary Science and Exploration
- Fire effects on ecosystems
- Geological formations and processes
- Geotechnical Engineering and Analysis
- Flood Risk Assessment and Management
- Image Processing and 3D Reconstruction
- Astro and Planetary Science
- Geological and Geophysical Studies
- Geophysics and Gravity Measurements
- Coastal and Marine Dynamics
- 3D Surveying and Cultural Heritage
- Paleontology and Stratigraphy of Fossils
- Remote Sensing and LiDAR Applications
- Seismology and Earthquake Studies
- Tree Root and Stability Studies
- Arctic and Antarctic ice dynamics
Geological Survey of Denmark and Greenland
2015-2024
Natural History Museum Aarhus
2016-2017
University of Copenhagen
2016-2017
Climate change is increasingly predisposing polar regions to large landslides. Tsunamigenic landslides have occurred recently in Greenland ( Kalaallit Nunaat ), but none been reported from the eastern fjords. In September 2023, we detected start of a 9-day-long, global 10.88-millihertz (92-second) monochromatic very-long-period (VLP) seismic signal, originating East Greenland. this study, demonstrate how event started with glacial thinning–induced rock-ice avalanche 25 × 10 6 cubic meters...
On December 15th 1952, at approximately 14:00 local time a mass of 5.9 × 106 m3 permafrozen talus deposits failed in landslide close to the Niiortuut mountain on south coast Nuussuaq peninsula, central West Greenland. Between 1.8 and 4.5 material entered sea generated tsunami that propagated through Vaigat strait (Sullorsuaq). Here we describe this catastrophic event for first by analysis historical supplemented recent fieldwork discuss implications state contemporary slopes. The killed...
The landslide of 17 June 2017 in Karrat Fjord, central West Greenland, highlighted the need for a better understanding landslides and landslide-generated tsunamis Greenland motivated screening project 2018, led by Geological Survey Denmark (GEUS; see also Svennevig et al. this volume). A part was to conduct preliminary mapping Quaternary historical – first effort its kind. main objective establish inventory database that can be used identify areas prone serve as tool gaining where, when why...
Abstract. The 17 June 2017 rock avalanche in the Karrat Fjord, West Greenland, caused a tsunami that flooded nearby village of Nuugaatsiaq and killed four people. disaster was entirely unexpected since no previous records large slope failures were known region, it highlighted need for better knowledge potentially hazardous slopes remote Arctic regions. aim paper is to explore our ability detect locate unstable regions with difficult access. We test this by examining case avalanche. workflow...
Abstract A large landslide (frozen debris avalanche) occurred at Assapaat on the south coast of Nuussuaq Peninsula in Central West Greenland June 13, 2021, 04:04 local time. We present a compilation available data from field observations, photos, remote sensing, and seismic monitoring to describe event. Analysis these combination with an analysis pre- post-failure digital elevation models results first description this type landslide. The frozen avalanche initiated as 6.9 * 10 6 m 3 failure...
Abstract On February 18, 2021 NASA's Perseverance rover landed in Jezero crater, located at the northwestern edge of Isidis basin on Mars. The uppermost surface present‐day crater floor is dominated by a distinct geologic assemblage previously referred to as dark‐toned floor. It consists smooth, unit overlying and variably covering light‐toned, roughly eroded deposits showing evidence discrete layers. In this study, we investigated stratigraphic relations between materials that comprise...
Abstract. The Vaigat strait (Sullorsuaq) in West Greenland is well known for its susceptibility to landslides and historical landslide-generated tsunamis. Recent mapping of the seabed has revealed several prehistoric giga-scale (volumes 109 m3) tsunamigenic landslides. However, timing these tsunamis largely unconstrained, but they are assumed have occurred after last deglaciation. Here, we report on lake sediment core records from four coastal lakes located between 19 91 m above sea level...
Abstract. Landslides are a frequent natural hazard occurring globally in regions with steep topography. Additionally, landslides play an important role landscape evolution by transporting sediment downslope. Landslide inventory mapping is common technique to assess the spatial distribution and extent of area interest. High-resolution digital elevation models (DEMs) have proven be useful databases map large areas across different land covers So far, Denmark had no national landslide...
Abstract Rock avalanche–triggered displacement waves (also termed tsunamis) have recently occurred in Greenland and Alaska, they illustrate the presence of such hazards polar regions. To improve understanding magnitude this hazard for these areas, we investigated gigascale subaerial rock avalanches impacting a partially confined water body within Vaigat strait (western Greenland). We present new combined to subaqueous digital elevation model, alongside compilation seismic data, which...
Abstract. The possibility of increased landslide activity as a result climate change has often been suggested, but few studies quantify this connection. Here, we present and utilize workflow for the first time solely using publicly available data to assess impact future changes in dynamic conditioning factors on movement. In our case apply three slow-moving coastal landslides near Vejle, presenting study its kind Danish landslides. We examine modelled water table depth (WTD) factor DK-HIP...
Abstract Climate change will increase the duration of annual sea‐ice‐free periods and shift precipitation patterns across Arctic. Those factors are likely to erosion rates along its coasts. Large parts Arctic coast consist hard rock. However, glacial, deltaic, coastal sedimentary deposits occur in deglaciated areas isostatic uplift following glaciations has created beach ridge plains pocket beaches with coarse soft‐sediment cliffs. Hitherto, very little was known about spatial distribution,...
Kilen, Kronprins Christian Land, contains the thickest and stratigraphically most complete Jurassic Cretaceous sediment succession in North Greenland. This study revises formalises lithostratigraphic framework of these deposits. The work is based on recent extensive stratigraphic field supplemented by photogeological mapping biostratigraphic studies, builds earlier conducted mainly 1980s 1990s. According to new scheme, more than 500 m thick divided into four formations. poorly dated...
The seminunatak Kilen in eastern North Greenland, with its complexly deformed Carboniferous-Cretaceous strata, is a key area to understand the tectonic history of transform plate boundary between Greenland and Svalbard. Detailed 3-D geological mapping from oblique photogrammetry along limited ground fieldwork interpretation previously published data forms basis for new structural model Kilen. Previous models interpreted rhombic-shaped fault patterns as evidence strike-slip tectonics. These...
When the Hale impact crater penetrated martian cryosphere 1Ga, landforms indicating post-impact volatile mobilisation were generated. We have found in ejecta blanket of Crater similar to 'permafrost molards' periglacial environments on Earth, and probably related past or present presence volatiles at/near surface. Permafrost molards are conical mounds debris associated with landslide deposits, resulting from degradation blocks ice-rich material mobilised by a terrains. Here we analyse...
On September 16th, 2023 at 12:35 UTC, a 25.5 M m3 rockslide occurred on the slope of Dickson Fjord in Northeast Greenland. The impacted gully glacier, leading to rock and ice avalanche that entered fjord causing an up 200 m high tsunami with observable runup 100 km away. event produced unprecedented very long period (VLP) seismic stations worldwide for nine days. Here we focus reconstructing dynamics landslide, while detailed analysis VLP signal is presented by Widmer-Schnidrig et al....
Abstract The 2021–2024 Nordic Waste Landslide, located near the village of Ølst in East Jutland, Denmark, was a significant geohazard event, occurring within former clay pit that had been repurposed as landfill for polluted soil. This study provides first analysis landslide’s development, characteristics, and causative factors. slow-to-moderate-moving landslide gained public attention December 2023 when it protruded beyond area, threatening to reach dispense pollutants large downstream...
Abstract On November 21, 2000 CE, the c . 48 × 10 6 m 3 Paatuut landslide in West Greenland triggered a tsunami with maximum runup height of c. 45 m. Although field team examined immediate aftermath, prior events and processes, addition to cause landslide, were never studied. We combined data, satellite images, historical photos bridge this knowledge gap. Our investigation unveiled that hitherto unknown 55 occurred at same slope May or June 1996. This was frozen debris avalanche, we suggest...
The powerful 3D mapping tool at the photogrammetry laboratory of Geological Survey Denmark and Greenland (GEUS) is ideal for collecting high-quality geological data in remote inaccessible areas with a high degree exposure such as (Vosgerau et al. 2010). So far this has been used to visualise extract very precise from aerial oblique photographs. In study reported on here, was generate modelling. Skaergaard intrusion (Fig. 1) well-known Eocene layered gabbro. had great importance understanding...
The landslide of 17 June 2017 at Karrat Fjord, central West Greenland, triggered a tsunami that caused four fatalities. catastrophe highlighted the need for better understanding landslides in Greenland and initiated recent nation-wide screening project led by Geological Survey Denmark (GEUS; see also Svennevig (2019) this volume).
 This paper describes an approach compiling freely available data to improve GEUS’ capability monitor active remote areas Arctic near real time. Data include...
The semi-nunatak Kilen is a key area to understand the setting of Cretaceous sedimentary basin in eastern North Greenland.The geometry has been obscured by later N-S compression and inversion presumable Palaeocene-Eocene age.A 3D restoration presented based on new oblique photogrammetry field data combined with published data.The focuses main faults well constrained mid-Cretaceous horizon.The shows that horizon was offset down-to-the-ENE several NNW-SSE-striking normal highlights similarity...