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United States · California

M3.1 Earthquake near Lassen County, California (United States)

UTC time: 2026-10-21 15:55:24 UTC Local time: —

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About this earthquake

A magnitude M3.1 earthquake was recorded near Lassen County, California (United States) on October 21, 2026 at 15:55 UTC. With a focal depth of about 6 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Shaking of this size is frequently noticed but usually harmless.

The data is provided by USGS and cross-checked across seismological networks. United States: over the past 24 hours, QuakeMap24 logged 131 earthquakes, the strongest at M3.7.

Details

ID
00f00417507cdb565cd11d5e1fee70244339bd0e
Magnitude
M3.1
Depth
6.2 km
UTC time
2026-10-21 15:55:24 UTC
Local time
—
Country
United States
State
California
City
Lassen County
County
Lassen County
Source
usgs
Coordinates
40.88350, -120.60616
Temperature
6.1°C

Depth profile

Depth profile Depth: 6.2 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 6.2 km
Shallow
6.2 km
6.2 km — shallower than 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

  • Lassen Volcanic Center
    Distance: 88 km ·Stratovolcano ·Elevation: 3'187 m ·Last eruption: 1917 ·United States
  • Medicine Lake
    Distance: 113 km ·Shield ·Elevation: 2'412 m ·Last eruption: 1060 ·United States
  • Shasta
    Distance: 145 km ·Stratovolcano ·Elevation: 4'317 m ·Last eruption: 1250 ·United States
  • Soda Lakes
    Distance: 211 km ·Maar(s) ·Elevation: 1'251 m ·United States
  • Crater Lake
    Distance: 260 km ·Caldera ·Elevation: 2'487 m ·Last eruption: -2850 ·United States
  • Clear Lake Volcanic Field
    Distance: 282 km ·Volcanic field ·Elevation: 1'439 m ·United States

California

Context for this earthquake

05 Oct 2025 – 05 Oct 2026 · M ≥ 3.0 · 239 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

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Historic earthquake map · United States

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Country statistics · United States

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