Scientists have found more than 360 seismic events beneath Antarctica's Thwaites Glacier, revealing a surge in glacial earthquakes caused by iceberg break-offs and collisions. The findings underscore ocean-driven instability in this critical marine-terminating glacier.
- 245 quakes linked to iceberg capsizing at Thwaites Glacier
- Seismic events coincide with accelerated glacier flow (2018-2020)
- Findings highlight ocean's role in glacial stability and sea-level rise
What happened
A recent study has identified over 360 previously undetected seismic events beneath Antarctica, primarily clustered near the marine end of Thwaites Glacier. These events, known as glacial earthquakes, occur when large icebergs break off the glacier's edge, capsize, and collide back with the ice, generating seismic waves. Most of the detected events, about 245, originated from this calving activity at Thwaites, often nicknamed the Doomsday Glacier due to its potential impact on sea-level rise.
Unlike traditional earthquakes, these glacial quakes generate low-frequency seismic waves that previously made them difficult to detect, especially in Antarctica. By employing seismic stations located on the continent itself, researchers were able to reveal this hidden seismic activity. The surge in these quakes notably aligned with a period between 2018 and 2020 during which the glacier's ice tongue accelerated toward the ocean, possibly driven by changing ocean conditions.
Why it feels good
Discovering these hidden glacial earthquakes provides vital insights into how Antarctica's glaciers respond dynamically to environmental changes. This deeper understanding helps scientists track the health and stability of ice sheets that strongly influence global sea levels. Understanding the mechanisms behind glacial movement and iceberg calving strengthens forecasts of future sea-level rise and informs climate action.
Moreover, the study’s innovative use of local Antarctic seismic sensors showcases the value of deploying new technologies and methods to explore previously overlooked natural phenomena. It highlights a path forward in monitoring remote regions more effectively, which can lead to better protection of vulnerable ecosystems and coastal communities worldwide.
What to enjoy or watch next
Scientists are continuing to investigate similar seismic events around Antarctica, particularly near Pine Island Glacier, where the detected quakes remain puzzling due to their distance from the shoreline. Further research will focus on understanding these events and their potential links to glacial dynamics or other geological processes.
At the same time, satellite and oceanographic studies alongside seismic monitoring are expected to shed more light on how ocean conditions impact the speed and stability of marine-terminating glaciers. Monitoring Thwaites Glacier closely remains a high priority given its significant role in possible future rapid sea-level rise. Staying informed about these developments helps the public appreciate the complex forces shaping our planet’s frozen frontiers.