Phys.org  June 12, 2024 The inner core structure influences the pattern of outer core convection and therefore Earth’s magnetic field. A team of researchers in the US (University of Southern California, Cornell University, University of Utah) compiled 143 distinct pairs of repeating earthquakes built from 121 earthquakes between 1991 and 2023 in the South Sandwich Islands. They analysed their inner-core-penetrating PKIKP waves recorded on the medium-aperture arrays in northern North America. They showed that many multiplets exhibit waveforms that change and then revert at later times to match earlier events. The matching waveforms revealed times at which the inner core […]