Earthquake · reviewed by a seismologist
M 2.5md
Earthquake near Le Grand, CA
No earthquake was likely felt in Le Grand in the 24 hours to 4:24 am PST (12:24 UTC). The last one was M 5.7, 258 km (160 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 Le Grand
This page: a magnitude 2.5 earthquake was recorded 21 km (13 mi) east-northeast of Le Grand, CA, at 1:40 pm PDT on 18 October 2021 (20:40 UTC), 20 km deep. 3 people have reported feeling it to USGS.
USGS: 21km ENE of Le Grand, CA
60 km (37 mi) NNW of Fresno, CA · 37 km (23 mi) N of Madera, CA
- When
- 1:40 pm PDT on 18 October 2021 ()
- Where
- 21 km (13 mi) east-northeast of Le Grand, CA · earthquakes near Le Grand
- Magnitude
- M 2.5 (md)
- Depth
- 20 km below the surface
- Felt
- 3 reports · strongest reported intensity III
- Nearest
- Madera County, 26 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1557 days ago
Earthquake alerts for Le Grand, 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 9 km (6 mi) from the epicentre. In Le Grand, 21 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.
Earthquakes near other towns within 30 km: Mariposa, Yosemite Lakes, Planada, Ahwahnee, Chowchilla, Fairmead.
How big was it?
This earthquake released about 160 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 95,000× the energy of this one
- Magna, Utah 2020 M 5.7 68,000× the energy of this one
- Around the size people start to feel M 3.0 6× the energy of this one
- This earthquake M 2.5 about 160 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
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 37.2917, -120.0248. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Madera County, CA | 26 km (16 mi) | ESE | earthquakes near Madera County |
| Mariposa County, CA | 33 km (20 mi) | NNE | earthquakes near Mariposa County |
| Merced County, CA | 63 km (39 mi) | W | earthquakes near Merced County |
| Fresno County, CA | 68 km (42 mi) | SSE | earthquakes near Fresno County |
| Tuolumne County, CA | 81 km (51 mi) | N | earthquakes near Tuolumne County |
| Stanislaus County, CA | 91 km (57 mi) | WNW | earthquakes near Stanislaus County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 2.3 21km S of Mariposa, CA
- 2.0 5km ENE of Bonadelle Ranchos-Madera Ranchos, CA
- 2.8 14km ENE of Midpines, CA
- 2.1 17km SSW of Mariposa, CA
- 2.2 7km ENE of Bonadelle Ranchos-Madera Ranchos, CA
- 2.0 5km ENE of Bonadelle Ranchos-Madera Ranchos, CA
- 1.8 5km E of Bonadelle Ranchos-Madera Ranchos, CA
- 2.1 6km ESE of Coarsegold, CA
- 1.7 8km SSE of Bootjack, CA
- 2.1 6km ENE of Bonadelle Ranchos-Madera Ranchos, CA
- 2.1 20km ENE of Le Grand, CA
- 2.0 6km NW of Friant, CA
- 2.5 21km S of Mariposa, CA
- 2.1 17km NE of Midpines, CA
- 2.1 5km ENE of Bonadelle Ranchos-Madera Ranchos, 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.