Earthquake · reviewed by a seismologist
M 4.3mw
Earthquake near Coalinga, CA
No earthquake was likely felt in Coalinga in the 24 hours to 10:25 pm PST (06:25 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 4.3 earthquake was recorded 25 km (16 mi) south-southwest of Coalinga, CA, at 12:17 pm PDT on 10 August 2023 (19:17 UTC), 9.5 km deep. 483 people have reported feeling it to USGS.
USGS: 6 km NW of Parkfield, CA
- When
- 12:17 pm PDT on 10 August 2023 ()
- Where
- 25 km (16 mi) south-southwest of Coalinga, CA · earthquakes near Coalinga
- Magnitude
- M 4.3 (mw)
- Depth
- 9.5 km below the surface
- Felt
- 483 reports · strongest reported intensity IV
- Measured shaking
- intensity V (ShakeMap)
- USGS impact alert
- green
- Tsunami
- USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
- Nearest
- San Luis Obispo County, 61 km S
- Nearest mapped fault
- San Andreas fault, 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 163 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 light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.
At this magnitude and depth, people at rest would likely notice it out to about 119 km (74 mi) from the epicentre. In Coalinga, 25 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 25 km, intensity III · Avenal 33 km, intensity III · Paso Robles 39 km, intensity III · Huron 45 km, intensity III · Kettleman City 48 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 40 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.3 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 4,300× the energy of this one
- Mineral, Virginia 2011 M 5.8 190× the energy of this one
- Magna, Utah 2020 M 5.7 130× the energy of this one
- This earthquake M 4.3 about 40 tons of TNT
- Around the size people start to feel M 3.0 this one released 83× 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 1 times the energy of this one.
Before 2016, the USGS record lists 22 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1983 Coalinga, California Earthquake · 37 km NNE of this epicentre
- 6.5 1922 Parkfield, California Earthquake · 29 km SE of this epicentre
- 6.4 1901 Parkfield, California Earthquake · 7 km N of this epicentre
- 6.0 2004 Parkfield, California Earthquake · 17 km SE of this epicentre
- 5.8 29 km NE of San Lucas, California · 48 km NNW 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 35.9345, -120.4840. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Luis Obispo County, CA | 61 km (38 mi) | S | earthquakes near San Luis Obispo County |
| Kings County, CA | 62 km (39 mi) | ENE | earthquakes near Kings County |
| Monterey County, CA | 82 km (51 mi) | WNW | earthquakes near Monterey County |
| San Benito County, CA | 93 km (58 mi) | NW | earthquakes near San Benito County |
| Fresno County, CA | 118 km (73 mi) | NE | earthquakes near Fresno County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 2.4 7 km NW of Kettleman City, CA
- 1.9 6 km NW of Kettleman City, CA
- 1.6 5 km ENE of Coalinga, CA
- 1.6 4 km ENE of Coalinga, CA
- 2.4 5 km ENE of Coalinga, CA
- 2.1 5 km ENE of Coalinga, CA
- 1.8 15 km NNW of Coalinga, CA
- 2.4 8 km NW of Kettleman City, CA
- 2.8 7 km NW of Parkfield, CA
- 1.9 6 km NNW of Cholame, CA
- 2.4 19 km NW of Parkfield, CA
- 2.2 15 km NNW of Coalinga, CA
- 1.6 8 km NW of Kettleman City, CA
- 1.5 16 km NW of Parkfield, CA
- 1.7 7 km 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.