Reno urged to prepare for more quakes

• Story Highlights
• NEW: More than 100 aftershocks rattle western edge of Reno, Nevada
  
• NEW: Scientists say an even bigger event may be coming
  
• A magnitude-4.7 quake hit at 11:40 p.m. Friday
  
• The area was rattled by a swarm of more than 100 quakes the day before
  
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