Science, Space and Technology News 2024
On 16 September 2023, a massive landslide in Greenland triggered a megatsunami, creating a standing wave that oscillated in Dickson Fjord for over a week, observed worldwide through seismic stations. This unusual long-duration signal from the standing wave offers new insights into megatsunami dynamics, with implications for understanding climate change impacts on glacier retreat and landslide frequency. .
Analysis of the seismic signals – shock waves that travel thousands of kilometers in the earth’s crust – showed that a so-called standing wave formed in the fjord after the landslide. Initially, the parts of the flank that fell into the water triggered a giant wave that spread through the entire fjord to the offshore island of Ella, more than 50 kilometers away.
Depending on the frequency range filtered out, the rockfall triggering the tsunami can be seen as a single peak , the standing wave sloshing back and forth as an undulating pattern in the recordings or the overall signal of the rockfall and the tsunami over the course of a week with strongly decreasing intensity of the oscillations . Credit: Angela Carillo Ponce et al.Such standing waves and the resulting long-period signals are already known in research.
This gives the researchers hope that they will be able to detect and analyze other similar events from the past. It is obvious that the retreat of glaciers, which previously filled entire valleys, and the thawing of permafrost are leading to increased landslides. Climate change is accelerating the melting of glaciers and could therefore increase the risk of megatsunamis.
Reference: “The 16 September 2023 Greenland Megatsunami: Analysis and Modeling of the Source and a Week‐Long, Monochromatic Seismic Signal” by Angela Carrillo‐Ponce, Sebastian Heimann, Gesa M. Petersen, Thomas R.
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