QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Susanville, CA

No earthquake was likely felt in Susanville in the 24 hours to 3:32 am PST (11:32 UTC). The last one was M 2.2, 15 km (9 mi) N, at 8:16 am PDT on 25 September 2026, estimated intensity II (weak) in town. Every earthquake near Susanville

This page: a magnitude 2.7 earthquake was recorded 15 km (9 mi) north-northwest of Susanville, CA, at 10:03 am PST on 30 December 2025 (18:03 UTC), 7.3 km deep. 2 people have reported feeling it to USGS.

USGS: 15 km NNW of Susanville, CA

10:03 am PST, Dec 30, 2025 · · 7.3 km deep · released about 320 lb of TNT

Every earthquake near Susanville Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lassen County 20 kmPlumas County 63 kmWashoe County 89 kmSierra County 109 kmShasta County 116 kmModoc County 116 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
10:03 am PST on 30 December 2025 ()
Where
15 km (9 mi) north-northwest of Susanville, CA · earthquakes near Susanville
Magnitude
M 2.7 (md)
Depth
7.3 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Lassen County, 20 km NNE
Nearest mapped fault
Honey Lake fault, 15 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 226 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 24 km (15 mi) from the epicentre. In Susanville, 15 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Susanville 15 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 320 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 48,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 34,000× the energy of this one
  3. Around the size people start to feel M 3.0 3× the energy of this one
  4. This earthquake M 2.7 about 320 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.7 on 2025-12-29 — about 1,100 times the energy of this one.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 40.5470, -120.6938. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lassen County, CA 20 km (12 mi) NNE earthquakes near Lassen County
Plumas County, CA 63 km (39 mi) S earthquakes near Plumas County
Washoe County, NV 89 km (56 mi) ENE earthquakes near Washoe County
Sierra County, CA 109 km (68 mi) S earthquakes near Sierra County
Shasta County, CA 116 km (72 mi) WNW earthquakes near Shasta County
Modoc County, CA 116 km (72 mi) N earthquakes near Modoc County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

43 earthquakes have been recorded within 50 km since this one.

  1. 1.7 4 km NE of Canyondam, CA
  2. 1.8 11 km NNE of Chester, CA
  3. 2.2 15 km NNW of Susanville, CA
  4. 1.8 13 km NNW of Susanville, CA
  5. 2.1 16 km NE of Litchfield, California
  6. 2.9 14 km NNW of Susanville, CA
  7. 2.0 14 km NNW of Susanville, CA
  8. 2.2 3 km SE of Johnstonville, CA
  9. 1.9 14 km NNW of Susanville, CA
  10. 1.8 14 km NNW of Susanville, CA
  11. 1.9 4 km WSW of Hamilton Branch, CA
  12. 1.6 13 km NNW of Susanville, CA
  13. 1.9 14 km NNW of Susanville, CA
  14. 2.7 15 km NNW of Susanville, CA
  15. 2.1 15 km NNW of Susanville, CA

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.