Iceberg Earthquakes Rattling Antarctica’s Doomsday Glacier
Here’s a breakdown of teh key facts from the provided text, focusing on earthquakes at the Thwaites and Pine Island Glaciers:
Thwaites glacier (“Doomsday Glacier”)
* Meaning: If it collapses, it could raise global sea levels by 3 meters (10 feet) and has the potential to collapse rapidly.
* Earthquake Location: About two-thirds of detected earthquakes (245 out of 362) were near the marine end of Thwaites.
* Cause of Earthquakes: Most likely caused by capsizing icebergs.
* Timing: A prolific period of earthquakes (2018-2020) coincided with an accelerated flow of the glacier’s ice tongue towards the sea. This speed-up was confirmed by satellite observations.
* driving Force: Not driven by annual air temperature changes (like in Greenland). The speed-up is potentially linked to ocean conditions, which are not yet fully understood.
* Implications: Suggests a short-term impact of ocean states on glacier stability and the need for further research to assess the glacier’s contribution to future sea-level rise.
* Earthquake Location: Earthquakes occurred 60-80 kilometers (37-50 miles) from the waterfront.
* Cause of Earthquakes: Not likely caused by capsizing icebergs.
* Status: These events are currently puzzling and require further investigation.
Overall Research Focus
* The research involves detecting glacial earthquakes to understand glacier behavior.
* Future research will continue to explore the link between glacial earthquakes and iceberg calving,as well as investigate the puzzling events near the Pine Island Glacier.