Minor M 3.1 Earthquake Strikes Off the Coast of Petrolia, California
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A minor 3.1 magnitude earthquake occurred early Tuesday morning approximately 31 kilometers west of Petrolia, California, at an extremely shallow depth.
What this USGS earthquake report tells you, and what most readers miss
This notice was issued by USGS on April 6, 2026 and geographically references Northern California. Its severity classification of "low" signals how the issuing agency weighs the risk of harm if no action is taken - "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to - Earthquakes - determines the monitoring protocol behind it, which shapes what follow-up action (checking for structural damage, watching for aftershocks, reviewing local building codes) is relevant and which agency holds authority over the assessment.
Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to verify its scope, source, and timestamp, then compare related notices without assuming that one record proves a broader trend.
Areazine pairs this record with the original agency URL so you can check the primary source before acting. Its related labels are earthquake, seismic, usgs, Northern California.
What Happened
A minor earthquake with a magnitude of 3.1 ml was recorded on February 10, 2026, at 12:30 UTC (4:30 AM local time). The seismic event occurred at an extremely shallow depth of 0.23 km.
Location Details
The earthquake was centered approximately 31 km (19 miles) west of Petrolia, California, in the waters off the coast. The geographic coordinates were recorded at latitude 40.2988 and longitude -124.6543. At a depth of 0.23 km, this is classified as a shallow earthquake; seismic events occurring at depths of less than 20 km are considered shallow and are more likely to be felt at the surface than deeper events.
Impact Assessment
According to USGS data, there are currently no felt reports associated with this event. No tsunami advisory, watch, or warning has been issued. The event has not been assigned a PAGER alert level, indicating a low likelihood of casualties or economic loss.
What You Should Know
Earthquakes with magnitudes between 2.5 and 3.9 are categorized as minor. While these events are often felt by people near the epicenter, they rarely cause damage to buildings or infrastructure. Residents in the region should be aware of the possibility of minor aftershocks. In the event of further shaking, safety officials recommend the "Drop, Cover, and Hold On" protocol.
Source
Information for this report was provided by the USGS Earthquake Hazards Program.
Original source: USGS Official Notice ↗
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