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M3.3 Depth: 13.7 km

M3.3 Earthquake near 33 km WNW of Boulder Creek, CA (United States)

UTC time: 2025-07-31 04:28:00 UTC Local time: —

About this earthquake

On July 31, 2025 at 04:28 UTC, a magnitude M3.3 earthquake occurred near 33 km WNW of Boulder Creek, CA (United States). The hypocenter lay relatively close to the surface at around 14 km, increasing how strongly it was felt. Earthquakes of this magnitude are often felt but rarely cause damage.

The data is provided by USGS and cross-checked across seismological networks. United States: 249 earthquakes were recorded in the past 24 hours, the strongest reaching M4.1.

Details

Magnitude
M3.3
Depth
13.7 km
UTC time
2025-07-31 04:28:00 UTC
Local time
—
Country
United States
City
California
Source
usgs
Coordinates
37.16833, -122.48850
Temperature
14.8°C

Map

Depth profile

Depth profile Depth: 13.7 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 13.7 km
Shallow
13.7 km
13.7 km — close to the regional average (15.3 km)
Regional average: 15.3 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: 202 km ·Volcanic field ·Elevation: 1'439 m ·United States
  • Mammoth Mountain
    Distance: 310 km ·Lava dome(s) ·Elevation: 3'369 m ·Last eruption: 1260 ·United States
  • Mono-Inyo Craters
    Distance: 313 km ·Lava dome(s) ·Elevation: 2'796 m ·Last eruption: 1380 ·United States
  • Mono Lake Volcanic Field
    Distance: 318 km ·Volcanic field ·Elevation: 2'121 m ·Last eruption: 1790 ·United States
  • Lassen Volcanic Center
    Distance: 379 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
  • Soda Lakes
    Distance: 410 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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