Tag Archives: fortresses

Geologists recently unveiled groundbreaking seismic evidence of massive, ancient “fortresses” located nearly 1,800 miles below the Earth’s surface, in the mantle. These colossal structures are not only older and tougher than the surrounding rock, but they have reshaped our understanding of the planet’s interior. Their discovery was made possible through innovative seismic techniques, and the findings have been published in …

Geologists have stumbled on what they call gigantic fortresses lying almost 1,800 miles below our feet in Earth’s mantle. New seismic evidence shows how these subterranean bulwarks are older and tougher than the cooler debris of dead ocean plates that surround them, turning a long‑running mystery into a concrete data story. Each fortress spans an area comparable to …