Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Fort Irwin, CA
No earthquake was likely felt in Fort Irwin in the 24 hours to 3:19 am PST (11:19 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 1.9 earthquake was recorded 19 km (12 mi) south-southeast of Fort Irwin, CA, at 12:28 am PST on 1 March 2018 (08:28 UTC), 11 km deep.
USGS: 19km SSE of Fort Irwin, CA
- When
- 12:28 am PST on 1 March 2018 ()
- Where
- 19 km (12 mi) south-southeast of Fort Irwin, CA · earthquakes near Fort Irwin
- Magnitude
- M 1.9 (ml)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- San Bernardino County, 46 km SE
- Nearest mapped fault
- Manix fault, 16 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 3178 days ago
Earthquake alerts for Fort Irwin, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 11 km (7 mi) from the epicentre. In Fort Irwin, 19 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.
How big was it?
This earthquake released about 24 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 640,000× the energy of this one
- Magna, Utah 2020 M 5.7 450,000× the energy of this one
- Around the size people start to feel M 3.0 40× the energy of this one
- This earthquake M 1.9 about 24 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:
- 6.5 The 1947 Manix, California Earthquake · 15 km SSE of this epicentre
- 5.3 20km ENE of Barstow, California · 27 km SW of this epicentre
- 5.1 46 km E of Barstow, California · 32 km S of this epicentre
- 5.1 25km W of Ludlow, CA · 47 km SSE of this epicentre
- 5.1 26km WNW of Ludlow, CA · 37 km SSE 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 35.1170, -116.5755. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Bernardino County, CA | 46 km (29 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
41 earthquakes have been recorded within 50 km since this one.
- 2.0 12km NE of Barstow, CA
- 2.0 8km ESE of Barstow, CA
- 1.6 19km S of Fort Irwin, CA
- 2.1 10km ENE of Barstow, CA
- 1.9 13km NE of Barstow, CA
- 2.0 29km E of Barstow, CA
- 2.2 25km WSW of Fort Irwin, CA
- 1.7 24km W of Ludlow, CA
- 1.9 23km SSE of Fort Irwin, CA
- 1.8 15km NW of Ludlow, CA
- 1.9 14km NW of Ludlow, CA
- 1.6 35km E of Barstow, CA
- 1.8 26km NW of Ludlow, CA
- 1.6 16km NNE of Barstow, CA
- 1.6 15km NW of Ludlow, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.