Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near Stratford, CA
No earthquake was likely felt in Stratford in the 24 hours to 10:23 am PST (18:23 UTC). The last one was M 1.8, 8 km (5 mi) SW, at 7:37 am PDT on 6 August 2026, estimated intensity II (weak) in town. Every earthquake near Stratford
This page: a magnitude 2.1 earthquake was recorded 5 km (3 mi) north of Stratford, CA, at 1:10 am PDT on 28 October 2021 (08:10 UTC), 22 km deep.
USGS: 5km N of Stratford, CA
61 km (38 mi) S of Fresno, CA · 19 km (12 mi) SW of Hanford, CA
- When
- 1:10 am PDT on 28 October 2021 ()
- Where
- 5 km (3 mi) north of Stratford, CA · earthquakes near Stratford
- Magnitude
- M 2.1 (md)
- Depth
- 22 km below the surface
- Felt
- no reports yet
- Nearest
- Kings County, 18 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1830 days ago
Earthquake alerts for Stratford, CA
Get a notification in this browser when USGS records an earthquake near Stratford, CA. No account or email needed.
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 it was probably too small to be felt, even directly above it. In Stratford, 5 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.
Earthquakes near other towns within 30 km: Lemoore Station, Lemoore, Armona, Home Garden, Hanford, Lucerne.
How big was it?
This earthquake released about 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
- Magna, Utah 2020 M 5.7 230,000× the energy of this one
- Around the size people start to feel M 3.0 20× the energy of this one
- This earthquake M 2.1 about 47 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 4.0 on 2018-11-27 — about 640 times the energy of this one.
Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1983 Coalinga, California Earthquake · 43 km W of this epicentre
- 5.6 8 km SW of Huron, California · 31 km WSW of this epicentre
- 5.5 11 km NNE of Coalinga, California · 41 km W of this epicentre
- 5.5 11 km NE of Coalinga, California · 40 km W of this epicentre
- 5.3 4 km NNE of Coalinga, California · 46 km W 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 36.2325, -119.8302. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kings County, CA | 18 km (11 mi) | S | earthquakes near Kings County |
| Fresno County, CA | 61 km (38 mi) | NNE | earthquakes near Fresno County |
| Tulare County, CA | 94 km (58 mi) | E | earthquakes near Tulare County |
| Madera County, CA | 109 km (68 mi) | N | earthquakes near Madera County |
| San Luis Obispo County, CA | 109 km (68 mi) | SSW | earthquakes near San Luis Obispo County |
| San Benito County, CA | 120 km (75 mi) | WNW | earthquakes near San Benito County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 2.2 12km ESE of Huron, CA
- 1.9 12km NNW of Kettleman City, CA
- 1.7 10km WSW of Huron, CA
- 1.7 7km E of Avenal, CA
- 1.9 7km WNW of Kettleman City, CA
- 2.4 5km S of Lanare, CA
- 2.6 6km ENE of Avenal, CA
- 1.6 5km ENE of Avenal, CA
- 1.6 12km N of Coalinga, CA
- 2.3 9km SW of Corcoran, CA
- 1.6 9km NNW of Avenal, CA
- 2.6 7km WSW of Avenal, CA
- 1.6 5km W of Avenal, CA
- 2.4 7km WSW of Avenal, CA
- 2.3 7km WSW of Avenal, 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.