Carly Miller is a scientific writer reporting discoveries in geology, paleontology, archeology, and innovation and technology. She has covered discoveries in dinosaur roosting behavior, Maya human sacrifices, the life-saving super senses of honeybees, and volcanic eruptions.
A megatsunami grew to over 656 feet tall and crashed over the shores of the beautiful and desolate Dickson Fjord on the eastern coast of Greenland on Sept. 16, 2023. The reason this event is newsworthy one year later is that the landslide and resultant megatsunami was only just identified as the source of a mysterious seismic signal that scientists from around the world recorded.
Each phase of this geologically significant event sent distinct recordable teleseismic signals far and wide to monitoring stations around the world. A high-water meter within the fjord on Ella Island registered the physical wave locally. Seismic sensors on the North Sea seafloor picked up the vibrations regionally, and global seismometers began transcribing the signal as a large, long-period seismic wave reached each one.
The geometry of the fjord, the fetch or wind patterns, the water depth, and the direction from which the landslide impacted the shoreline all played a role in perpetuating the wave action after the initial behemoth megatsunami hit the shores of the Dickson Fjord.
The physical water displacement mechanism that causes the megatsunami differs from a classic tsunami. A tsunami sense stricto is caused by sudden slip along a fault in the oceanic crust. The ocean wave that propagates from these sub-sea earthquakes grows in height above sea level as it travels from deep water into shallow waters near shore.
Eastern Greenland Megatsunami Reverberates Dickson Fjord Megatsunami Seismic Activity Geophysics
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