A new study on the 2017 quake that killed 300 in Mexico City finds that both its location and cause were unusual. But seismologists say it could happen again.
Sun pillars happen when sunlight reflects from plate-like ice crystals, drifting through Earth's atmosphere with a horizontal orientation, gently rocking from side to side as they fall. Photo taken March 12 by Wally Roth, near Lantzville, British Columbia.
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