Seismic Swarm S20240619.1 Near Goldfield, Nevada: Geological Context and Event Analysis

The region 38 km south of Goldfield, Nevada, sits within the Basin and Range Province, where ongoing crustal extension along normal faults produces frequent shallow seismicity. This tectonic setting, part of the broader Walker Lane shear zone transition, has hosted recurrent earthquake swarms for decades. Historical records document 19 swarms in the area since 2000, with notable activity clusters in 2007, 2010–2012, 2015, and 2019–2021.

Swarm S20240619.1 began at 14:14 on 18 June 2024 and concluded at 05:02 on 26 June 2024, spanning 182 hours and 47 minutes. During this period, 102 earthquakes were recorded. Analysis of the first 100 events reveals predominantly low-magnitude activity, with depths ranging from 0 to 9 km and a clear concentration between 3 and 5 km. The largest event reached magnitude 3.0 on 21 June at 03:16, while most events fell between 0.5 and 1.5. A secondary peak of magnitude 2.4 occurred on 20 June, and isolated events of 2.0–2.2 were noted later in the sequence.

Temporal distribution shows an initial burst on 18–19 June, followed by sustained low-level activity through 25 June. Depths remained consistently shallow, consistent with fluid-driven swarm behavior typical of the Basin and Range. No events exceeded magnitude 3.0 in the examined subset, indicating limited energy release.

This swarm aligns with the region’s established pattern of episodic, swarm-type seismicity rather than mainshock-aftershock sequences. Such activity reflects the interplay of regional extension and possible hydrothermal influences in the volcanic and sedimentary rocks surrounding Goldfield.

References

SeismoSight internal swarm classification S20240619.1
USGS Earthquake Hazards Program – Nevada seismicity overview
Nevada Bureau of Mines and Geology – Basin and Range tectonics summary