Geology

Dozens of people reported tremors on the island of Bornholm, but seismologists say there was no earthquake

Echoes from earthquakes suggest that Earth’s solid inner core has its own core

The planet’s solid inner core might rotate at a different rate than the rest of the planet, and that rate might be changing

Heavy rains may have set off an outpouring of ash and gases from Indonesia’s volcano Semeru “like uncorking a soda bottle”

The magma that is fueling the first eruption of Hawaii’s Mauna Loa volcano in nearly 40 years is less likely to cause explosive effusions than magma at other volcanoes

Hawaii’s Mauna Loa, the largest active volcano on Earth, erupted for the first time in nearly 40 years. Its eruptions tend to be shorter-lived than those of the other Big Island volcanoes, and its lava is more liquid and flows faster

“Paleo valleys,” carved by ice age rivers and now underground, could provide spaces to recharge California’s depleted groundwater

A controversial new theory suggests the Milky Way galaxy’s arms sent comets hurtling toward early Earth, where impacts built new continental crust

A new formation method for rare “lonsdaleite” diamonds may illuminate a better way to produce them on Earth

A diamond contains the only known sample of a mineral from Earth’s mantle—and hints at oceans’ worth of water hidden deep within our planet

A huge number of minerals’ origins are tied to life on Earth

Ice sheets amplify clues from Iceland’s hidden volcanoes