Seismic Swarm S20080210.1 Near Beatty, Nevada
An earthquake swarm designated S20080210.1 was recorded in the region 44 km east-southeast of Beatty, Nevada. The sequence began at 23:48 UTC on 9 February 2008 and concluded at 06:56 UTC on 12 February 2008, spanning 55 hours and 8 minutes. During this period, 40 events were registered, with magnitudes ranging from -0.3 to 0.5 and focal depths primarily between 5 km and 15 km.
The swarm exhibited a typical pattern of low-magnitude, closely spaced events clustered over a short timeframe. Initial activity on 9 February included a single event at magnitude 0.0. The following day saw the highest frequency of detections, concentrated between 09:00 and 17:00 UTC, with repeated events at depths of 7–9 km. Activity tapered on 11 February before two final events on 12 February at greater depths of 11–15 km.
This event fits within a documented pattern of seismic swarms in the area. Since 1 January 2000, nineteen swarms have occurred in the same locale, distributed across the years 2000 (two swarms), 2002 (eight), 2003 (two), 2005 (five), 2007 (one), and 2008 (one). Such recurrent swarms reflect ongoing tectonic processes rather than isolated mainshock-aftershock sequences.
The Beatty region lies within the Basin and Range Province of the western United States, characterized by extensional tectonics driven by the interaction between the Pacific and North American plates. Normal and strike-slip faults accommodate crustal stretching, producing frequent small-magnitude earthquakes. Depths recorded in the swarm align with the brittle-ductile transition zone typical of this province, where most seismicity occurs between 5 km and 15 km.
Historical monitoring by regional networks confirms that Nevada experiences elevated rates of swarm activity compared with other parts of the contiguous United States, often linked to fluid migration or minor magmatic influences beneath the surface. The 2008 swarm’s parameters remain consistent with these regional characteristics.
References
- United States Geological Survey Earthquake Hazards Program
- Nevada Seismological Laboratory regional catalogs
- SeismoSight internal swarm classification records