Seismic Swarm S20240602.1 Near Whites City, New Mexico: Geological Context and Event Analysis

A seismic swarm designated S20240602.1 occurred 58 km south of Whites City in southeastern New Mexico. The sequence began at 22:17 on 1 June 2024 and concluded at 08:23 on 3 June 2024, lasting 34 hours and 6 minutes. During this period, 31 earthquakes were recorded.

The events clustered at shallow depths between 2 and 8 km. Magnitudes ranged from 1.5 to 3.7, with the largest shock reaching 3.7 at 15:27 on 2 June. Other notable events included a 3.5-magnitude earthquake at 00:04 on 2 June and several shocks of 2.8–2.9. Activity showed a typical swarm pattern: an initial rise in frequency followed by a gradual decline, without a single dominant mainshock.

The location lies within the Delaware Basin, a major subdivision of the Permian Basin. This region features thick sequences of Paleozoic sedimentary rocks, including evaporites and carbonates, overlying Precambrian basement. Tectonic history involves repeated phases of subsidence, salt mobilization, and minor fault reactivation since the late Paleozoic. Natural seismicity remains low, yet the basin has recorded rising numbers of small earthquakes since the early 2010s, largely attributed to wastewater injection associated with hydrocarbon production.

Historical records maintained by SeismoSight indicate 16 swarms in the same general area since 1 January 2000. Yearly totals show marked acceleration: one swarm in 2022, twelve in 2023, and three in 2024 to date. This recent increase aligns with expanded fluid-injection operations across the Permian Basin and suggests that many swarms are induced rather than purely tectonic.

The S20240602.1 swarm fits this emerging pattern. Most hypocenters occurred at depths consistent with injection horizons in the basin. The tight spatial clustering and short overall duration further support a fluid-driven mechanism in which pore-pressure changes reduce effective stress on pre-existing faults.

Continued monitoring remains essential. Even moderate swarms can produce felt shaking and may precede larger events if injection volumes continue to rise. Integration of real-time seismic data with injection records will improve understanding of triggering thresholds in this geologically complex setting.

References

SeismoSight internal swarm catalog (S20240602.1 parameters and historical statistics).
U.S. Geological Survey, “Induced Earthquakes,” updated 2024.
New Mexico Bureau of Geology and Mineral Resources, “Geology of the Delaware Basin,” 2023.