Seismic Swarm S20130617.1 Near Johnson Lane, Nevada
Seismic swarm S20130617.1 occurred approximately 7 km north-northeast of Johnson Lane in Douglas County, Nevada. The sequence began at 11:30 on 16 June 2013 and concluded at 03:30 on 23 June 2013, spanning 160 hours and encompassing 72 earthquakes. Magnitudes ranged from -0.4 to 2.8, with the majority of events clustered between 7 and 11 km depth and a few outliers reaching 0 km and 13 km. Two events attained the maximum magnitude of 2.8, occurring on 16 and 20 June.
Activity showed temporal clustering, with notable concentrations on 16 June and 20 June. Depths remained predominantly around 9 km, consistent with shallow crustal faulting typical of the area. Negative and low-magnitude events were frequent, indicating microseismicity that often accompanies swarm sequences driven by localized stress perturbations rather than a single large rupture.
Johnson Lane lies within the Basin and Range Province of western Nevada, where crustal extension produces north-trending normal faults and horst-and-graben topography. The locale also sits near the northern Walker Lane, a northwest-trending zone of right-lateral shear that accommodates part of the transform motion between the Pacific and North American plates. This tectonic setting generates recurrent small-to-moderate earthquakes along distributed faults.
Historical records since 2000 document only two swarms in the immediate vicinity: one in 2005 and the present 2013 sequence. Such episodic swarms reflect transient fluid migration or aseismic slip along favorably oriented faults within the actively deforming region.
The 2013 swarm released limited seismic energy and produced no reported damage. Its occurrence underscores the persistent low-level seismicity that characterizes the Walker Lane transition zone and highlights the value of dense seismic monitoring for identifying subtle patterns in fault behavior.
References
- Nevada Seismological Laboratory, University of Nevada, Reno
- U.S. Geological Survey Earthquake Catalog
- Nevada Bureau of Mines and Geology, Geological Overview of Western Nevada