Earth’s inner core shows seismic anisotropy, with waves 3–4% faster along the rotation axis than at the equator, increasing with depth. Sotomayor warns of major power shift NASCAR’s Greg Biffle and ...

Earth’s inner core has long puzzled scientists because seismic waves move through it unevenly. Compressional waves from earthquakes travel about 3 to 4 percent faster along the planet’s rotation axis ...

Deep beneath our feet, far beyond the reach of drills or submersibles, Earth hides a solid metal heart that behaves in ways geophysicists have struggled to explain. New experiments now suggest that a ...