M2.5 earthquake 2km E of Aromas, CA

A magnitude 2.5 earthquake struck 2km E of Aromas, CA on Sun, May 31, 2020, 11:45 AM PDT (18:45 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M3.4 8km NE of Alum Rock, CA. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.48	Md, duration	Northern California Seismic System	Preferred · Final · ±0.179 · 85 stations
2.3	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.074 · 24 stations

12 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 124 in the 60 days after this one and 71 in the 30 days before it.

The first 60 of 124.

From the USGS Earthquake Hazards Program and its partner networks, event nc73400026 (also filed as us6000a393). Read Sun, Oct 4, 2026, 8:33 PM UTC.