Earthquake swarm rattles Death Valley, California

A M0.9 earthquake occurred 26 km (16.2 miles) northwest of Furnace Creek, California data depth of 1.5 km (0.9 miles) at 11:56 UTC on October 24, at a depth of 1.5 km (0.9 miles). Later that day, an M1.1 earthquake was recorded 5 km (3.1 miles) east-southeast of Stovepipe Wells at a depth of 4.2 km (2.6 miles). Close in time, a M1.3 earthquake struck 25 km (15.5 miles) northwest of Furnace Creek, at a depth of 8.1 km (5 miles).

The strongest earthquake on October 24 was M3.1 at 22:24 UTC, located 4 km (2.5 miles) east of Stovepipe Wells at a depth of 4.3 km (2.7 miles). This was followed by two M1.7 quakes east-southeast of Stovepipe Wells and an M1.5 earthquake northwest of Furnace Creek at a depth of 3.3 km (2.1 miles).

Seismic activity in the area increased on October 25, beginning with an M4.2 earthquake at 06:52 UTC, located 4 km (2.5 miles) east of Stovepipe Wells at 4.3 km (2.7 miles) depth, followed by the swarm’s largest recorded event—a magnitude 4.7—at 08:05 UTC east of Stovepipe Wells, also at a depth of 4.3 km (2.7 miles).

Another significant event was observed at 15:04 UTC on October 25, with a M4.5 earthquake located 10 km (6.2 miles) southeast of Stovepipe Wells at a depth of 4.6 km (2.9 miles).

From October 24 at 11:56 UTC to October 28 at 08:50 UTC, a total of 64 earthquakes were recorded by the USGS in this region, marking a notable increase in localized seismic activity.

The Death Valley region, situated along the eastern edge of California near the Pacific-North American plate boundary, experiences frequent seismic activity driven by complex tectonic interactions.

Three primary fault lines run through Death Valley — the Northern Death Valley Fault Zone (NDVFZ), the Black Mountains Fault Zone (BMFZ), and the Southern Death Valley Fault Zone (SDVFZ).

This area lies within the Basin and Range Province, where extensional forces are responsible for crustal thinning, leading to a network of normal faults.

These faults accommodate both extensional and, in some regions, strike-slip motion, contributing to the regular occurrence of low- to moderate-magnitude earthquakes.

Seismicity in the Death Valley area is characterized by shallow to mid-crustal earthquakes, typically ranging from the surface down to depths of around 15 km (9.3 miles).

Earthquakes in this region are often grouped into swarms, where multiple events of varying magnitudes occur in close proximity and over short periods. These swarms are influenced by both tectonic stress changes along active faults and fluid movement within fault zones, a phenomenon observed in several similar geologically active areas globally.

Earthquake swarms, like the one recorded in October 2024, are not uncommon in this region and are not necessarily a precursor to larger seismic events. They show the dynamic nature of the underlying fault systems and the continuous crustal adjustments occurring in the Basin and Range Province.

The Death Valley Fault Zone, the Furnace Creek Fault Zone, and other local structures play significant roles in accommodating the tectonic stresses in this area, which, while not typically producing large-magnitude quakes, contributes to the steady background seismicity observed.

References:

¹ M4.7 earthquake Death Valley, California – USGS – October 25, 2024

Teo Blašković

I'm a dedicated researcher, journalist, and editor at The Watchers. With over 20 years of experience in the media industry, I specialize in hard science news, focusing on extreme weather, seismic and volcanic activity, space weather, and astronomy, including near-Earth objects and planetary defense strategies. You can reach me at teo /at/ watchers.news.

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