Magnitude 3.3 Earthquake Rattles Near Rio Dell Area

A magnitude 3.3 earthquake was recorded near Rio Dell on Sunday evening, March 15, 2026, according to the U.S. Geological Survey (USGS).

The quake occurred at 5:48 p.m. PT and was located about 12 kilometers west-southwest of Rio Dell in Humboldt County, according to USGS data.

USGS reported the earthquake occurred at a depth of approximately 26 kilometers.

3.3 magnitude #earthquake. 12 km from Rio Dell, CA, #UnitedStates https://t.co/U0vcAZeMAI

— Earthquake Alerts (@QuakesToday) March 16, 2026

The quake registered Level II on the Modified Mercalli Intensity scale, meaning it was weak but may be felt by a small number of people. According to USGS, about four people submitted reports indicating they felt the shaking.

Nearby communities include Ferndale, Hydesville, and Petrolia.

As of now, no injuries or damage have been reported in the area.

Several smaller earthquakes were also recorded in nearby areas prior to the Rio Dell event.

Earlier on March 15 at about 3:50 p.m., a magnitude 2.8 earthquake was recorded roughly 30 kilometers west of Petrolia at a depth of about 195 kilometers.

Before that, a magnitude 1.9 quake was recorded near Petrolia on March 14 at around 9:49 p.m., with a depth of about 9.2 kilometers.

Why Northern California Experiences Frequent Earthquakes

According to the USGS, Northern California is one of the most seismically active regions in the country because it sits near major fault systems, including the San Andreas Fault and the Healdsburg-Rodgers Creek fault system.

Movement along these faults creates tectonic stress that can trigger earthquakes of varying magnitudes. Some smaller earthquakes in the region may also be linked to human-related activities such as geothermal energy production.

At The Geysers Geothermal Field, steam extraction and the injection of cooled water into underground reservoirs can change pressure and temperature in surrounding rocks, which may occasionally trigger small earthquakes, according to USGS research.

Earthquake Safety Tips

Officials advise residents to remain calm and follow basic safety steps during an earthquake. If indoors, stay inside and follow the “Drop, Cover, and Hold On” method under a sturdy desk or table while protecting your head and neck.

People should stay clear of windows, glass, fireplaces, and heavy furniture that could fall, and avoid running outside while the ground is shaking.

If outdoors, move to an open area away from buildings, trees, and power lines. Drivers should carefully pull over, avoid stopping under bridges or overpasses, and remain inside the vehicle until the shaking stops.