Earthquake · reviewed by a seismologist
M 1.8md
Earthquake near Oakhurst, CA
No earthquake was likely felt in Oakhurst in the 24 hours to 3:01 am PST (11:01 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 1.8 earthquake was recorded 28 km (18 mi) northeast of Oakhurst, CA, at 10:32 pm PDT on 19 September 2021 (05:32 UTC), 12 km deep.
USGS: 28km NE of Oakhurst, CA
85 km (53 mi) NNE of Fresno, CA
- When
- 10:32 pm PDT on 19 September 2021 ()
- Where
- 28 km (18 mi) northeast of Oakhurst, CA · earthquakes near Oakhurst
- Magnitude
- M 1.8 (md)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Madera County, 43 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1879 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 6 km (4 mi) from the epicentre. In Oakhurst, 28 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 15 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 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 730,000× the energy of this one
- Around the size people start to feel M 3.0 65× the energy of this one
- This earthquake M 1.8 about 15 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 2,500 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 · 49 km ENE of this epicentre
- 5.9 8 km NNE of Mammoth Lakes, California · 49 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 · 46 km E of this epicentre
- 5.4 12 km SE of Mammoth Lakes, California · 47 km ENE 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 37.4782, -119.3922. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Madera County, CA | 43 km (27 mi) | SW | earthquakes near Madera County |
| Mariposa County, CA | 47 km (29 mi) | WNW | earthquakes near Mariposa County |
| Mono County, CA | 67 km (41 mi) | NE | earthquakes near Mono County |
| Tuolumne County, CA | 79 km (49 mi) | NW | earthquakes near Tuolumne County |
| Fresno County, CA | 83 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
56 earthquakes have been recorded within 50 km since this one.
- 1.6 16km ESE of Yosemite Valley, CA
- 1.6 16km ESE of Yosemite Valley, CA
- 2.1 16km ESE of Yosemite Valley, CA
- 2.1 16km ESE of Yosemite Valley, CA
- 1.7 20km SE of Yosemite Valley, CA
- 1.8 18km WSW of Toms Place, CA
- 1.8 21km ESE of Yosemite Valley, CA
- 1.7 19km SE of Yosemite Valley, CA
- 2.0 8km W of North Fork, CA
- 1.6 19km SE of Yosemite Valley, CA
- 1.5 19km SE of Yosemite Valley, CA
- 2.4 18km SW of Toms Place, CA
- 1.8 17km ESE of Yosemite Valley, CA
- 2.0 17km WSW of Toms Place, CA
- 1.8 19km SE of Yosemite Valley, 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.