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Nevada State Geologist Jim Faulds said the Rock Valley Fault zone has a recent history of generating small earthquakes, including a January 1999 swarm that included eight earthquakes between magnitudes 3 and 4.7.
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The State of Nevada Nuclear Waste Project Office website describes earthquake activity as a safety concern for operation of a high-level nuclear waste repository at Yucca Mountain.
There have been 621 seismic events of magnitudes greater than 2.5 within a 50-mile radius of the mountain since 1976, according to the state’s website.
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