Preprints
https://doi.org/10.5194/nhess-2023-32
https://doi.org/10.5194/nhess-2023-32
13 Mar 2023
 | 13 Mar 2023
Status: a revised version of this preprint was accepted for the journal NHESS and is expected to appear here in due course.

Giant mid-Holocene landslide-generated tsunamis recorded in lake sediments from Saqqaq, West Greenland

Niels J. Korsgaard, Kristian Svennevig, Anne S. Søndergaard, Gregor Luetzenburg, Mimmi Oksman, and Nicolaj K. Larsen

Abstract. The Vaigat strait (Sullorsuaq) in central West Greenland is well known for its susceptibility to landslides and historical landslide-generated tsunamis. Recent mapping of the seabed in the Vaigat Strait has revealed several prehistoric giga-scale tsunamigenic landslides; however, their ages are unknown. Here, we report sedimentological evidence from six coastal lakes at 19 to 134 m above sea level (a.s.l.) on the Saqqaq foreland located at the eastern end of Vaigat. Using optical, X-ray fluorescence (XRF), and magnetic susceptibility core scanning in our sedimentological analysis along with a screening for marine diatoms and radiocarbon dating, we find evidence of at least two tsunami events occurring at 7.6 and 7.3 cal. ka BP. Using a previously published, recalibrated relative sea level curve from Arveprinsen Ejland (Alluttoq), located 40 km southeast of Saqqaq, we infer wave run-up heights of 41–66 and 45–70 m respectively for the two tsunamis. These run-up heights from prehistoric tsunamis are several orders of magnitude larger than the historic landslide-tsunami run-up heights at Saqqaq which only reached an elevation of c. 3 m in November 2000. While two giant tsunamis can be found in the lake sediment records, landforms from at least nine giga-scale landslides are present on the seafloor of Vaigat, we infer that the older giant tsunamis must have happened between the last deglaciation and the oldest sediment in the lakes (c. 10 to 8.5 cal. ka BP).

Niels J. Korsgaard, Kristian Svennevig, Anne S. Søndergaard, Gregor Luetzenburg, Mimmi Oksman, and Nicolaj K. Larsen

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2023-32', Anonymous Referee #1, 28 Mar 2023
    • AC2: 'Reply on RC1', Niels Jákup Korsgaard, 09 Jun 2023
  • RC2: 'Comment on nhess-2023-32', Marc De Batist, 09 Apr 2023
    • AC1: 'Reply on RC2', Niels Jákup Korsgaard, 13 Apr 2023
    • AC3: 'Reply on RC2', Niels Jákup Korsgaard, 09 Jun 2023
  • RC3: 'Comment on nhess-2023-32', Stein Bondevik, 24 Apr 2023
    • AC4: 'Reply on RC3', Niels Jákup Korsgaard, 09 Jun 2023

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on nhess-2023-32', Anonymous Referee #1, 28 Mar 2023
    • AC2: 'Reply on RC1', Niels Jákup Korsgaard, 09 Jun 2023
  • RC2: 'Comment on nhess-2023-32', Marc De Batist, 09 Apr 2023
    • AC1: 'Reply on RC2', Niels Jákup Korsgaard, 13 Apr 2023
    • AC3: 'Reply on RC2', Niels Jákup Korsgaard, 09 Jun 2023
  • RC3: 'Comment on nhess-2023-32', Stein Bondevik, 24 Apr 2023
    • AC4: 'Reply on RC3', Niels Jákup Korsgaard, 09 Jun 2023
Niels J. Korsgaard, Kristian Svennevig, Anne S. Søndergaard, Gregor Luetzenburg, Mimmi Oksman, and Nicolaj K. Larsen
Niels J. Korsgaard, Kristian Svennevig, Anne S. Søndergaard, Gregor Luetzenburg, Mimmi Oksman, and Nicolaj K. Larsen

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Short summary
A tsunami wave will leave evidence of erosion and deposition in coastal lakes, making it possible to determine the run-up height and when it occurred. Here, we use six lakes today located at elevations 19–134 m. a.s.l. close to the settlement of Saqqaq, West Greenland, to show that at least two giant tsunamis occurred 7300–7600 years ago with run-up heights larger than 40 m. We infer, that any tsunamis from at least nine giga-scale landslides must have happened 8500–10000 years ago.
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