Earthquake · reviewed by a seismologist
M 1.8md
Earthquake near Huron, CA
No earthquake was likely felt in Huron in the 24 hours to 3:56 am PST (11:56 UTC). The last one was M 2.2, 10 km (6 mi) SE, at 2:35 am PDT on 16 September 2026, estimated intensity II (weak) in town. Every earthquake near Huron
This page: a magnitude 1.8 earthquake was recorded 10 km (6 mi) west of Huron, CA, at 12:36 pm PST on 24 February 2021 (20:36 UTC), 3.9 km deep.
USGS: 10km W of Huron, CA
73 km (45 mi) SSW of Fresno, CA · 51 km (32 mi) WSW of Hanford, CA
- When
- 12:36 pm PST on 24 February 2021 ()
- Where
- 10 km (6 mi) west of Huron, CA · earthquakes near Huron
- Magnitude
- M 1.8 (md)
- Depth
- 3.9 km below the surface
- Felt
- no reports yet
- Nearest
- Kings County, 39 km ESE
- Nearest mapped fault
- Great Valley thrust fault system, under 1 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 2085 days ago
Earthquake alerts for Huron, CA
Get a notification in this browser when USGS records an earthquake near Huron, 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, people at rest would likely notice it out to about 13 km (8 mi) from the epicentre. In Huron, 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: Huron 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 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
- Magna, Utah 2020 M 5.7 620,000× the energy of this one
- Around the size people start to feel M 3.0 55× the energy of this one
- This earthquake M 1.8 about 17 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 4.3 on 2019-12-17 — about 4,700 times the energy of this one.
Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1983 Coalinga, California Earthquake · 9 km W of this epicentre
- 6.4 1901 Parkfield, California Earthquake · 36 km SW of this epicentre
- 6.1 Northwest of Huron, California · 47 km NW of this epicentre
- 6.0 2004 Parkfield, California Earthquake · 47 km SSW of this epicentre
- 5.6 8 km SW of Huron, California · 10 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 36.2177, -120.2090. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kings County, CA | 39 km (24 mi) | ESE | earthquakes near Kings County |
| Fresno County, CA | 78 km (49 mi) | NE | earthquakes near Fresno County |
| San Benito County, CA | 90 km (56 mi) | WNW | earthquakes near San Benito County |
| San Luis Obispo County, CA | 95 km (59 mi) | SSW | earthquakes near San Luis Obispo County |
| Monterey County, CA | 99 km (62 mi) | W | earthquakes near Monterey County |
| Madera County, CA | 118 km (73 mi) | NNE | earthquakes near Madera County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 1.6 21km NW of Parkfield, CA
- 1.6 16km NW of Parkfield, CA
- 1.6 20km S of Kettleman City, CA
- 1.9 22km NE of San Ardo, CA
- 1.9 22km NE of San Ardo, CA
- 1.5 18km NW of Parkfield, CA
- 1.7 11km WSW of Huron, CA
- 1.7 18km NW of Parkfield, CA
- 2.2 6km SSE of Riverdale, CA
- 2.0 12km NW of Parkfield, CA
- 1.6 18km SSE of Kettleman City, CA
- 3.6 11km WSW of Huron, CA
- 1.5 3km ENE of Coalinga, CA
- 2.5 22km ENE of San Ardo, CA
- 2.0 22km ENE of San Ardo, 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.