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Tag: seafloor

'Surprise' Palu tsunami clue found on seafloor

'Surprise' Palu tsunami clue found on seafloor

Science
Scientists are getting closer to understanding the tsunami that struck Palu in Indonesia in September. Damaging waves rushed ashore after a Magnitude 7.8 quake, but researchers said at the time that they were surprised by their size. Now, a survey in the bay in front of the Sulawesi city shows significant subsidence of the seabed. This likely contributed to the abrupt displacement of water that then crashed on to land. More than 2,000 people lost their lives in the disaster. Preliminary results of various investigations are being reported here at the Fall Meeting of the American Geophysical Union - the largest annual gathering of Earth and space scientists. The quake occurred on what is called a...
Seafloor mapping XPRIZE final will be in the Mediterranean, off Greek coast

Seafloor mapping XPRIZE final will be in the Mediterranean, off Greek coast

Science
The final of the ocean XPRIZE, which will see fleets of robots compete to map the largest area of seafloor inside 24 hours, will take place in deep waters off the coast of Greece. Teams will be invited in turn to showcase their technologies, starting in early November. They will have to chart at least 250 sq km at depths down to 4,000m, and image 10 items of interest. The group that comes out on top will win $ 4m. Second place earns $ 1m. The Shell Ocean Discovery XPRIZE was launched in 2015 to find systems and approaches that could finally map the world's ocean basins to an acceptable precision. Currently, less than 15% of their bathymetry (depth) has been measured in a meaningfully accurate way. It is one of those truisms that ...
Antarctica's grounding lines are retreating across the seafloor

Antarctica's grounding lines are retreating across the seafloor

Science
April 2 (UPI) -- The grounding lines of Antarctica are on the retreat on the ocean floor. According to a new study by scientists at the University of Leeds, warm ocean water is shrinking Antarctica's underwater footprint.According to the new data, published this week in the journal Nature Geoscience, the Southern Ocean melted 565 square miles of underwater ice between 2010 and 2016.Antarctica's glaciers have been retreating at an average rate of 82 feet per year. But the rate retreat of the grounding lines of eight of the ice sheet's 65 largest glaciers is five times greater, roughly 410 feet per year.The most dramatic rates of grounding line retreat were measured along the coast of West Antarctica."Our study provides clear evidence that retreat is happening across the ice sheet due to oce...