Actual title:<p><i>Full-waveform inversion reveals diverse origins of lower mantle positive wave speed anomalies</i><p>A popularized summary from StudyFinds, which led me to the original paper:<p><i>Scientists mystified by massive structures found deep beneath the Pacific Ocean</i><p><a href="https://studyfinds.org/massive-structures-deep-beneath-pacific-ocean-mantle/" rel="nofollow">https://studyfinds.org/massive-structures-deep-beneath-pacif...</a>