QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

Earthquake near Fort Irwin, CA

No earthquake was likely felt in Fort Irwin in the 24 hours to 6:01 am PST (14:01 UTC). The last one was M 4.3, 103 km (64 mi) W, at 9:40 am PDT on 13 July 2026, estimated intensity II (weak) in town; 1,090 felt reports to USGS. Every earthquake near Fort Irwin

This page: a magnitude 2.2 earthquake was recorded 10 km (6 mi) northwest of Fort Irwin, CA, at 12:44 am PDT on 29 April 2021 (07:44 UTC), 7.9 km deep.

USGS: 10km NW of Fort Irwin, CA

12:44 am PDT, Apr 29, 2021 · · 7.9 km deep · released about 67 lb of TNT

Every earthquake near Fort Irwin Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 74 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
12:44 am PDT on 29 April 2021 ()
Where
10 km (6 mi) northwest of Fort Irwin, CA · earthquakes near Fort Irwin
Magnitude
M 2.2 (ml)
Depth
7.9 km below the surface
Felt
no reports yet
Nearest
San Bernardino County, 74 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2023 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 17 km (11 mi) from the epicentre. In Fort Irwin, 10 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: Fort Irwin 10 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 67 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 230,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 160,000× the energy of this one
  3. Around the size people start to feel M 3.0 14× the energy of this one
  4. This earthquake M 2.2 about 67 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 4.6 on 2020-01-25 — about 3,800 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 6.5 The 1947 Manix, California Earthquake · 43 km SSE of this epicentre
  2. 5.3 20km ENE of Barstow, California · 39 km S of this epicentre
  3. 5.0 27km S of Fort Irwin, CA · 34 km S of this epicentre

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 35.3175, -116.7712. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Bernardino County, CA 74 km (46 mi) SE earthquakes near San Bernardino County

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

Aftershocks so far

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

  1. 3.5 28km ENE of Barstow, CA
  2. 2.0 23km WSW of Fort Irwin, CA
  3. 1.7 12km ENE of Barstow, CA
  4. 1.8 28km E of Barstow, CA
  5. 1.9 28km ENE of Barstow, CA
  6. 1.9 28km ENE of Barstow, CA
  7. 2.5 28km ENE of Barstow, CA
  8. 3.6 28km ENE of Barstow, CA
  9. 1.9 23km NNW of Barstow, CA
  10. 1.9 22km SSE of Fort Irwin, CA
  11. 2.3 13km NNE of Barstow, CA
  12. 2.5 41km NNW of Fort Irwin, CA
  13. 1.7 24km SE of Fort Irwin, CA
  14. 1.8 38km WSW of Tecopa, CA
  15. 2.2 8km ENE of Barstow, 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.