The cluster is considered a swarm of earthquakes because the sequence contains a large number of events but does not have a clear mainshock (an earthquake clearly larger than the rest in the sequence)," Cochran said.
Many residents in Stovepipe Wells and Furnace Creek were woken up by the overnight 4.7 quake. Some described being able to hear the earthquake before they felt it.
Death Valley has multiple fault lines - Cochran said namely the Towne Pass Fault and Northern Death Valley Fault - that cover a large area in eastern California and Nevada.
Seismologists keep a close eye on the area, using seismic monitoring stations across California and Nevada. The two states see the second and fourth most earthquakes a year.
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