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United States · California

M4.3 Earthquake near Sonoma County, California (United States)

UTC time: 2026-07-29 02:40:06 UTC Local time: —

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About this earthquake

A magnitude M4.3 earthquake was recorded near Sonoma County, California (United States) on July 29, 2026 at 02:40 UTC. With a focal depth of about 9 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Earthquakes of this magnitude are clearly felt; minor damage to vulnerable buildings is possible.

The data is provided by USGS and cross-checked across seismological networks. United States: over the past 24 hours, QuakeMap24 logged 179 earthquakes, the strongest at M3.9.

Details

ID
e054a98be53db8660dd4a91c88373b4d0b76f4e1
Magnitude
M4.3
Depth
9.0 km
UTC time
2026-07-29 02:40:06 UTC
Local time
—
Country
United States
State
California
City
Sonoma County
County
Sonoma County
Source
usgs
Coordinates
38.76990, -122.92410
Temperature
25.1°C

Depth profile

Depth profile Depth: 9 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 9 km
Shallow
9 km
9 km — shallower than the regional average (15.2 km)
Regional average: 15.2 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

Official USGS aftershock forecast

Probability of at least one aftershock at or above the specified magnitude during the entire stated time window. This does not predict an individual earthquake.

Issued: Sep 9, 2026, 2:40 AM UTC · Last checked: Sep 14, 2026, 5:07 AM UTC

Sep 9, 2026, 3:00 AM UTC – Sep 10, 2026, 3:00 AM UTC · Expired
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.00.32 %0–0
M ≥ 4.00.03 %0–0
M ≥ 5.0< 0.01 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Sep 9, 2026, 3:00 AM UTC – Sep 16, 2026, 3:00 AM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.02.05 %0–0
M ≥ 4.00.21 %0–0
M ≥ 5.00.02 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Sep 9, 2026, 3:00 AM UTC – Oct 9, 2026, 3:00 AM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.07.05 %0–1
M ≥ 4.00.73 %0–0
M ≥ 5.00.07 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Sep 9, 2026, 3:00 AM UTC – Sep 9, 2027, 3:00 AM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.027.22 %0–2
M ≥ 4.03.14 %0–1
M ≥ 5.00.32 %0–0
M ≥ 6.00.03 %0–0
M ≥ 7.0< 0.01 %0–0

The range is the 95% forecast interval for the number of earthquakes. Magnitude thresholds and time windows overlap: do not add the values. Windows already in progress still refer to the entire stated period.

Source: USGS — Operational Aftershock Forecast

Volcanoes nearby

  • Clear Lake Volcanic Field
    Distance: 26 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Lassen Volcanic Center
    Distance: 227 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
  • Shasta
    Distance: 300 km ·Stratovolcano ·Elevation: 4'317 m ·Last eruption: 1250 ·United States
  • Medicine Lake
    Distance: 337 km ·Shield ·Elevation: 2'412 m ·Last eruption: 1060 ·United States
  • Mono Lake Volcanic Field
    Distance: 350 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States
  • Mono-Inyo Craters
    Distance: 356 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States

Radius · 50 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

  • Charles M. Schulz Sonoma County AirportUnited States · STS · KSTS
    30.6 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-09-14

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

California

Context for this earthquake

14 Sep 2025 – 14 Sep 2026 · M ≥ 3.0 · 241 Catalogue entries

Of 240 other entries for this area and period, 17 have a higher stored magnitude. Different magnitude types and reports not yet merged limit the comparison.

Open seismic profile

Historic earthquake map · United States

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Explore recent and long-term earthquake activity in this country. Use filters to narrow down by magnitude, depth, and date range.

Country statistics · United States

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

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