wrote Sigridur Kristjansdottir, a seismologist in Iceland. Nonspecialists also expressed excitement online.

The colors in the sky were indeed spectacular. Imagine the Northern Lights, but in blood orange instead of the usual electric green. Or the glowing orbs of an early Mark Rothko canvas.

Or Björk’s orange hair, circa 2011, a few years before she filmed her music video in the vicinity of Mount Fagradalsfjall.

Elian Peltier contributed reporting.

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