U.S.
Mexico's Popocatepetl Volcano spews ash miles into the air
CNN 17 hours ago
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Quake rattles northwest China
Reuters Videos Quake rattles northwest China
An earthquake with a magnitude up to 6.7 hits the Xinjiang region of China near the border with Tajikistan. Rough cut (no reporter narration).
U.S.
Mega-earthquakes strike where fault lines are flat
Cosmos Magazine Fri, Nov 25 12:00 AM PST
The flat north section of the subduction zone sliding beneath Japan – the dark blue line near the top of this image – is a prime spot for earthquakes larger than magnitude-9 to strike, new research says. When it comes to giant earthquakes, it’s the smooth, ramp-shaped fault lines you need to watch. New work published in Science changes how seismologists understand which parts of the world are capable of producing a mega-quake – magnitude 8.5 or greater – and adds Mexico to the hit list, despite there being no historical evidence of mega-quakes there. “This is potentially quite a significant change in our understanding of how thrust faults operate,” says Paul Somerville, a geoscientist at Macquarie University in Sydney, who wasn't involved in the study. ...