[Rockhounds] 650-Foot High Megatsunami in Greenland Sends Seismic Waves Worldwide

[Kreigh Tomaszewski]

*In September 2023, a megatsunami in Greenland triggered seismic waves
worldwide, caused by a landslide in Dickson Fjord. The event generated two
seismic signals: a high-energy signal from the landslide and a long-lasting
VLP signal from a seiche in the fjord. The findings offer new insights into
the risks posed by climate change and landslides in Greenland.*

In September 2023, a massive tsunami in remote eastern Greenland triggered
seismic waves that captured the attention of researchers worldwide.

The event created a week-long oscillating wave in Dickson Fjord, according
to a new report in *The Seismic Record*.

Angela Carrillo-Ponce of GFZ German Research Centre for Geoscience and her
colleagues identified two distinct signals in the seismic data from the
event: one high-energy signal caused by the massive rockslide that
generated the tsunami, and one very long-period (VLP) signal that lasted
over a week.

Their analysis of the VLP signal—which was detected as far as 5000
kilometers (3100 miles) away—suggests that the landslide and resulting
tsunami created a seiche, or a standing wave that oscillates in a body of
water. In this case, the seiche was churning for days between the shores of
Dickson Fjord.

https://scitechdaily.com/650-foot-high-megatsunami-in-greenland-sends-seismic-waves-worldwide/