Seismic Swarm S20250607.2 Recorded South of Whites City, New Mexico

A seismic swarm designated S20250607.2 was recorded beginning at 01:37 on 7 June 2025 and concluding at 14:32 on 8 June 2025. The events occurred 55 km south of Whites City, New Mexico, within the Delaware Basin. In a period of 36 hours and 55 minutes, 31 earthquakes were detected.

The swarm exhibited magnitudes ranging from 0.9 to 3.3, with the majority of hypocenters located between 4 km and 8 km depth. Two events reached magnitude 3.3, occurring at 05:38 and 11:02 on 7 June, both at 6 km depth. Additional notable shocks included a magnitude 3.1 at 00:44 on 8 June and a magnitude 2.9 at 16:48 on 7 June. Depths remained consistent throughout, indicating activity within a shallow crustal layer typical of the basin.

Temporal clustering was evident, with heightened activity during morning and afternoon hours on 7 June. Smaller events (magnitudes below 2.0) comprised the bulk of the sequence, reflecting the characteristic pattern of fluid-related swarms where mainshocks trigger numerous aftershocks of lesser intensity.

Since 1 January 2000, fifteen such swarms have been documented in the region. Annual counts show an increase in recent years: one swarm in 2022, seven in 2023, four in 2024, and three in 2025. This trend aligns with broader observations of elevated seismicity rates in the Permian Basin over the past decade.

The location lies in the southern Delaware Basin, part of the larger Permian Basin geologic province spanning western Texas and southeastern New Mexico. The basin formed during the Pennsylvanian and Permian periods through subsidence and sediment accumulation, resulting in thick sequences of carbonates, evaporites, and clastic rocks. These strata overlie Precambrian basement and host extensive hydrocarbon reservoirs. Modern seismic activity in this area frequently correlates with industrial operations involving wastewater disposal into deep aquifers, which can induce slip on pre-existing faults at depths of 4–8 km.

The Guadalupe Mountains to the west and the Central Basin Platform to the east bound the Delaware Basin structurally, with fault systems oriented predominantly northwest-southeast. Historical records indicate that natural seismicity was low prior to expanded oil and gas development, underscoring the role of anthropogenic factors in contemporary swarm occurrences.

References
SeismoSight internal swarm classification S20250607.2
USGS Earthquake Hazards Program regional tectonic summaries
New Mexico Bureau of Geology and Mineral Resources Permian Basin reports