Earthquake · reviewed by a seismologist
M 3.6mw
Earthquake near Huron, CA
No earthquake was likely felt in Huron in the 24 hours to 6:15 am PST (14:15 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 3.6 earthquake was recorded 11 km (7 mi) west-southwest of Huron, CA, at 7:44 am PDT on 18 May 2021 (14:44 UTC), 9.0 km deep. 35 people have reported feeling it to USGS.
USGS: 11km WSW of Huron, CA
78 km (49 mi) SSW of Fresno, CA · 53 km (33 mi) WSW of Hanford, CA
- When
- 7:44 am PDT on 18 May 2021 ()
- Where
- 11 km (7 mi) west-southwest of Huron, CA · earthquakes near Huron
- Magnitude
- M 3.6 (mw)
- Depth
- 9.0 km below the surface
- Felt
- 35 reports · strongest reported intensity III
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Kings County, 37 km ESE
- Nearest mapped fault
- Great Valley thrust fault system, 5 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 1937 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 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 71 km (44 mi) from the epicentre. In Huron, 11 km away, the estimate is intensity III (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 11 km, intensity III · Coalinga 14 km, intensity III · Avenal 19 km, intensity III · Kettleman City 28 km, intensity III · Lemoore 41 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 4.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 40,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 1,800× the energy of this one
- Magna, Utah 2020 M 5.7 1,300× the energy of this one
- This earthquake M 3.6 about 4.2 tons of TNT
- Around the size people start to feel M 3.0 this one released 8.8× more
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 9.8 times the energy of this one.
Before 2016, the USGS record lists 17 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1983 Coalinga, California Earthquake · 12 km NW of this epicentre
- 6.5 1922 Parkfield, California Earthquake · 46 km S of this epicentre
- 6.4 1901 Parkfield, California Earthquake · 32 km SW of this epicentre
- 6.0 2004 Parkfield, California Earthquake · 41 km SSW of this epicentre
- 5.6 8 km SW of Huron, California · 5 km ESE 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 36.1632, -120.2117. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kings County, CA | 37 km (23 mi) | ESE | earthquakes near Kings County |
| Fresno County, CA | 83 km (52 mi) | NE | earthquakes near Fresno County |
| San Luis Obispo County, CA | 89 km (55 mi) | SSW | earthquakes near San Luis Obispo County |
| San Benito County, CA | 93 km (58 mi) | WNW | earthquakes near San Benito County |
| Monterey County, CA | 99 km (62 mi) | W | earthquakes near Monterey County |
| Merced County, CA | 123 km (77 mi) | NNW | earthquakes near Merced County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.6 6km NNW of Cholame, CA
- 2.4 7km NW of Lemoore, CA
- 1.5 10km SE of Avenal, CA
- 1.6 6km WSW of Kettleman City, CA
- 3.2 4km NNW of Cholame, CA
- 2.8 10km W of Avenal, CA
- 1.9 10km W of Avenal, CA
- 2.2 11km NW of Parkfield, CA
- 2.8 23km NW of Parkfield, CA
- 1.6 13km NW of Avenal, CA
- 2.3 5km SSE of Parkfield, CA
- 3.8 15km SSE of New Idria, CA
- 1.9 9km NNW of Avenal, CA
- 1.5 7km NNW of Cholame, CA
- 1.8 25km NW of Parkfield, 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.