CNN reports the earth hasn't stopped rumbling under Southern California since Thursday.br That's when a powerful 6.4-magnitude earthquake rattled Ridgecrest and the surrounding area.br The US Geological Survey says the quake was followed by more than 1,400 aftershocks.br On Friday, an even stronger quake -- with a magnitude of 7.1 --- rattled the region.br The USGS says there's been an average of one aftershock per minute since Friday's quake.br They are coming in every 30 seconds, every minute.