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illustration of seismic waves under a mountain

NUCLEAR SHAKEDOWN  Rumblings of seismic waves reveal clues about North Korea’s nuclear weapons tests, detonated in a mountain.

Sentinel-1 satellite image of Larsen C

COMPLETELY CRACKED  Images from the European Space Agency’s Sentinel-1 satellites confirm the crack of Larsen C has reached the Weddell Sea, allowing an iceberg weighing 1 trillion metric tons to calve.

Sierra Nevada mountains

ON THE REBOUND  Weighed down with water during wet winters, California’s northern mountain ranges — like the Sierra Nevada, shown — rebound during dry summers. This seasonal flexing leads to an uptick in small quakes along some faults, new research finds.

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