This article is part of TPM Cafe, TPM’s home for opinion and news analysis. It was originally published at The Conversation.
Earthquake scientists detected an unusual signal on monitoring stations used to detect seismic activity during September 2023. We saw it on sensors everywhere, from the Arctic to Antarctica.
We were baffled — the signal was unlike any previously recorded. Instead of the frequency-rich rumble typical of earthquakes, this was a monotonous hum, containing only a single vibration frequency. Even more puzzling was that the signal kept going for nine days.
Uncharted waters
But beyond the weirdness of this scientific marvel, this event underscores a deeper and more unsettling truth: climate change is reshaping our planet and our scientific methods in ways we are only beginning to understand.
It is a stark reminder that we are navigating uncharted waters. Just a year ago, the idea that a seiche could persist for nine days would have been dismissed as absurd. Similarly, a century ago, the notion that warming could destabilise slopes in the Arctic, leading to massive landslides and tsunamis happening almost yearly, would have been considered far-fetched. Yet, these once-unthinkable events are now becoming our new reality.
As we move deeper into this new era, we can expect to witness more phenomena that defy our previous understanding, simply because our experience does not encompass the extreme conditions we are now encountering. We found a nine-day wave that previously no one could imagine could exist.
Traditionally, discussions about climate change have focused on us looking upwards and outwards to the atmosphere and to the oceans with shifting weather patterns, and rising sea levels. But Dickson Fjord forces us to look downward, to the very crust beneath our feet.
For perhaps the first time, climate change has triggered a seismic event with global implications. The landslide in Greenland sent vibrations through the Earth, shaking the planet and generating seismic waves that travelled all around the globe, within an hour of the event. No piece of ground beneath our feet was immune to these vibrations, metaphorically opening up fissures in our understanding of these events.
This will happen again
Although landslide-tsunamis have been recorded before, the one in September 2023 was the first ever seen in east Greenland, an area that had appeared immune to these catastrophic climate change induced events.
This certainly won’t be the last such landslide-megatsunami. As permafrost on steep slopes continues to warm and glaciers continue to thin we can expect these events to happen more often and on an even bigger scale across the world’s polar and mountainous regions. Recently identified unstable slopes in west Greenland and in Alaska are clear examples of looming disasters.
As we confront these extreme and unexpected events, it is becoming clear that our existing scientific methods and toolkits may need to be fully equipped to deal with them. We had no standard workflow to analyse 2023 Greenland event. We also must adopt a new mindset because our current understanding is shaped by a now near-extinct, previously stable climate.
As we continue to alter our planet’s climate, we must be prepared for unexpected phenomena that challenge our current understanding and demand new ways of thinking. The ground beneath us is shaking, both literally and figuratively. While the scientific community must adapt and pave the way for informed decisions, it’s up to decision-makers to act.
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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