Scientists have found anomalous structures around the Earth’s core

The video discusses a study published in Science on June 12th, which analyzed 7000 seismograms from earthquakes of magnitude 6.5 or greater, occurring between 1990 and 2008. Using a machine learning algorithm called Sequencer, researchers searched for seismic wave echoes beneath the Pacific Ocean. They discovered an anomalous structure under the Marquesas Islands and found that a known structure beneath the Hawaiian Islands is larger than previously thought.

What type of seismic waves did the researchers specifically search for?

What did the results reveal about the structure beneath the Hawaiian Islands?