Three dozen earthquakes over the past week in central Arkansas shook shelves, rattled nerves and prompted speculation about their cause.

Are they being being triggered or are they natural? That's something we don't know," Arkansas Geological Survey scientist Scott Ausbrook said…

BEIJING — A massive landslide engulfed a gold mining area in mountainous Tibet, burying 83 workers believed to have been asleep early Friday morning [March 29, 2013] , Chinese state media said.

About 2 million cubic meters (2.6 million cubic yards) of mud, rock and debris swept…