Earthquake · reviewed by a seismologist
M 3.4mw
Earthquake near Coalinga, CA
No earthquake was likely felt in Coalinga in the 24 hours to 3:11 am PST (11:11 UTC). The last one was M 2.3, 4 km (3 mi) SE, at 1:44 am PDT on 4 October 2026, estimated intensity II (weak) in town. Every earthquake near Coalinga
This page: a magnitude 3.4 earthquake was recorded 7 km (4 mi) northeast of Coalinga, CA, at 2:45 am PDT on 18 October 2021 (09:45 UTC), 10 km deep. 24 people have reported feeling it to USGS.
USGS: 7km NE of Coalinga, CA
81 km (50 mi) SW of Fresno, CA
- When
- 2:45 am PDT on 18 October 2021 ()
- Where
- 7 km (4 mi) northeast of Coalinga, CA · earthquakes near Coalinga
- Magnitude
- M 3.4 (mw)
- Depth
- 10 km below the surface
- Felt
- 24 reports · strongest reported intensity III
- Measured shaking
- intensity III (ShakeMap)
- Nearest
- Kings County, 46 km ESE
- Nearest mapped fault
- Great Valley thrust fault system, 10 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 1783 days ago
Earthquake alerts for Coalinga, CA
Get a notification in this browser when USGS records an earthquake near Coalinga, 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 59 km (37 mi) from the epicentre. In Coalinga, 7 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: Coalinga 7 km, intensity III · Huron 19 km, intensity III · Avenal 26 km, intensity II · Kettleman City 37 km, intensity II · Lemoore 49 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 2.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 78,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 3,500× the energy of this one
- Magna, Utah 2020 M 5.7 2,500× the energy of this one
- This earthquake M 3.4 about 2.2 tons of TNT
- Around the size people start to feel M 3.0 this one released 4.6× 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 19 times the energy of this one.
Before 2016, the USGS record lists 21 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1983 Coalinga, California Earthquake · 5 km N of this epicentre
- 6.5 1922 Parkfield, California Earthquake · 49 km S of this epicentre
- 6.4 1901 Parkfield, California Earthquake · 27 km SW of this epicentre
- 6.1 Northwest of Huron, California · 44 km NW of this epicentre
- 6.0 2004 Parkfield, California Earthquake · 41 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 36.1858, -120.3092. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kings County, CA | 46 km (29 mi) | ESE | earthquakes near Kings County |
| San Benito County, CA | 84 km (52 mi) | NW | earthquakes near San Benito County |
| Fresno County, CA | 87 km (54 mi) | NE | earthquakes near Fresno County |
| San Luis Obispo County, CA | 90 km (56 mi) | S | earthquakes near San Luis Obispo County |
| Monterey County, CA | 90 km (56 mi) | W | earthquakes near Monterey County |
| Merced County, CA | 118 km (73 mi) | NNW | earthquakes near Merced County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
47 earthquakes have been recorded within 50 km since this one.
- 1.8 9km SSE of Huron, CA
- 1.9 16km NW of Parkfield, CA
- 2.0 17km NW of Parkfield, CA
- 1.7 24km ENE of San Ardo, CA
- 1.6 18km WNW of Coalinga, CA
- 2.2 5km NW of Avenal, CA
- 1.7 25km E of San Ardo, CA
- 2.3 25km E of San Ardo, CA
- 1.7 8km SSE of Kettleman City, CA
- 1.9 3km SW of Huron, CA
- 2.8 8km NNW of Cholame, CA
- 3.0 7km NNW of Cholame, CA
- 1.5 13km SW of Huron, CA
- 1.8 6km NNE of Avenal, CA
- 2.6 10km NNE 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.