Earthquake · reviewed by a seismologist
M 2.3md
Earthquake near Oakhurst, CA
No earthquake was likely felt in Oakhurst in the 24 hours to 1:17 pm PST (21:17 UTC). The last one was M 5.7, 230 km (143 mi) NNE, at 6:29 pm PDT on 13 April 2026, estimated intensity II (weak) in town; 6,515 felt reports to USGS. Every earthquake near Oakhurst
This page: a magnitude 2.3 earthquake was recorded 29 km (18 mi) northeast of Oakhurst, CA, at 9:23 pm PDT on 18 August 2021 (04:23 UTC), 10 km deep.
USGS: 29km NE of Oakhurst, CA
86 km (53 mi) NNE of Fresno, CA
- When
- 9:23 pm PDT on 18 August 2021 ()
- Where
- 29 km (18 mi) northeast of Oakhurst, CA · earthquakes near Oakhurst
- Magnitude
- M 2.3 (md)
- Depth
- 10 km below the surface
- Felt
- no reports yet
- Nearest
- Madera County, 44 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1907 days ago
Earthquake alerts for Oakhurst, CA
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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 16 km (10 mi) from the epicentre. In Oakhurst, 29 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.
How big was it?
This earthquake released about 77 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
- Magna, Utah 2020 M 5.7 140,000× the energy of this one
- Around the size people start to feel M 3.0 12× the energy of this one
- This earthquake M 2.3 about 77 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 2020-04-05 — about 470 times the energy of this one.
Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:
- 6.0 7 km ENE of Mammoth Lakes, California · 48 km ENE of this epicentre
- 5.9 8 km NNE of Mammoth Lakes, California · 48 km ENE of this epicentre
- 5.9 11 km SE of Mammoth Lakes, California · 48 km ENE of this epicentre
- 5.7 14 km WSW of Aspen Springs, California · 45 km E of this epicentre
- 5.4 12 km SE of Mammoth Lakes, California · 46 km E 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 37.4835, -119.3895. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Madera County, CA | 44 km (27 mi) | SW | earthquakes near Madera County |
| Mariposa County, CA | 47 km (29 mi) | WNW | earthquakes near Mariposa County |
| Mono County, CA | 66 km (41 mi) | NE | earthquakes near Mono County |
| Tuolumne County, CA | 78 km (49 mi) | NW | earthquakes near Tuolumne County |
| Fresno County, CA | 84 km (52 mi) | SSW | earthquakes near Fresno County |
| Merced County, CA | 122 km (76 mi) | WSW | 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.
- 2.1 19km SE of Yosemite Valley, CA
- 1.8 20km SE of Yosemite Valley, CA
- 1.7 16km WSW of Toms Place, CA
- 2.3 17km WSW of Toms Place, CA
- 1.9 17km WSW of Toms Place, CA
- 2.5 16km WSW of Toms Place, CA
- 2.0 30km ENE of Shaver Lake, CA
- 1.6 17km WSW of Toms Place, CA
- 1.8 29km NE of Oakhurst, CA
- 1.6 17km WSW of Mammoth Lakes, CA
- 1.9 30km NE of Oakhurst, CA
- 2.4 17km WSW of Mammoth Lakes, CA
- 1.5 32km ENE of Shaver Lake, CA
- 1.6 7km ENE of Mammoth Lakes, CA
- 2.1 0km SW of Yosemite Lakes, 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.