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M4.2 Depth: 0.9 km

M4.2 Earthquake near Sonoma County, California (United States)

UTC time: 2026-02-21 17:22:55 UTC Local time: —

About this earthquake

A magnitude M4.2 earthquake was recorded near Sonoma County, California (United States) on February 21, 2026 at 17:22 UTC. The hypocenter lay relatively close to the surface at around 1 km, increasing how strongly it was felt. Tremors of this size are distinctly felt and can occasionally cause light damage.

The data is provided by EMSC and cross-checked across seismological networks. United States: 198 earthquakes were recorded in the past 24 hours, the strongest reaching M5.8.

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Depth profile

Depth profile Depth: 0.9 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 0.9 km
Shallow
0.9 km
0.9 km — shallower than the regional average (15.9 km)
Regional average: 15.9 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Volcanoes nearby

  • Clear Lake Volcanic Field
    Distance: 16 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Lassen Volcanic Center
    Distance: 216 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
  • Shasta
    Distance: 292 km ·Stratovolcano ·Elevation: 4'317 m ·Last eruption: 1250 ·United States
  • Medicine Lake
    Distance: 327 km ·Shield ·Elevation: 2'412 m ·Last eruption: 1060 ·United States
  • Mono Lake Volcanic Field
    Distance: 340 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States
  • Soda Lakes
    Distance: 346 km ·Maar(s) ·Elevation: 1'251 m ·United States

Historic earthquake map · United States

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Country statistics · United States

Country overview
View earthquake KPIs, strongest and latest events, and averages for this country.

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