Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near South Dos Palos, CA
No earthquake was likely felt in South Dos Palos in the 24 hours to 10:00 pm PST (06:00 UTC). The last one was M 3.9, 64 km (40 mi) SW, at 3:19 am PDT on 11 August 2026, estimated intensity II (weak) in town; 34 felt reports to USGS. Every earthquake near South Dos Palos
This page: a magnitude 2.1 earthquake was recorded 23 km (14 mi) south of South Dos Palos, CA, at 3:29 pm PDT on 21 April 2021 (22:29 UTC), less than 1 km deep. 1 person has reported feeling it to USGS.
USGS: 23km S of South Dos Palos, CA
58 km (36 mi) WSW of Madera, CA · 117 km (72 mi) ESE of San Jose, CA
- When
- 3:29 pm PDT on 21 April 2021 ()
- Where
- 23 km (14 mi) south of South Dos Palos, CA · earthquakes near South Dos Palos
- Magnitude
- M 2.1 (md)
- Depth
- -0.1 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- San Benito County, 39 km WSW
- Nearest mapped fault
- Great Valley thrust fault system, 2 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 2030 days ago
Earthquake alerts for South Dos Palos, 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 17 km (11 mi) from the epicentre. In South Dos Palos, 23 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: Firebaugh, Dos Palos, Mendota.
How big was it?
This earthquake released about 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
- Magna, Utah 2020 M 5.7 270,000× the energy of this one
- Around the size people start to feel M 3.0 24× the energy of this one
- This earthquake M 2.1 about 40 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 4.3 on 2021-01-02 — about 2,300 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 6.1 Northwest of Huron, California · 30 km SSE of this epicentre
- 5.9 10 km SE of Tres Pinos, California · 48 km W of this epicentre
- 5.2 25 km NE of Soledad, California · 43 km WSW of this epicentre
- 5.0 21 km NE of Soledad, California · 48 km WSW of this epicentre
- 5.0 28km NE of King City, CA · 46 km SSW 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 36.7577, -120.6880. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Benito County, CA | 39 km (24 mi) | WSW | earthquakes near San Benito County |
| Merced County, CA | 49 km (30 mi) | N | earthquakes near Merced County |
| Monterey County, CA | 80 km (50 mi) | SW | earthquakes near Monterey County |
| Fresno County, CA | 92 km (57 mi) | E | earthquakes near Fresno County |
| Stanislaus County, CA | 94 km (58 mi) | NNW | earthquakes near Stanislaus County |
| Madera County, CA | 97 km (60 mi) | ENE | earthquakes near Madera County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 2.1 4km NE of Pinnacles, CA
- 1.6 5km NNE of Pinnacles, CA
- 1.9 6km NNW of Pinnacles, CA
- 1.8 2km NE of Pinnacles, CA
- 1.7 4km NNE of Pinnacles, CA
- 2.9 5km NNW of Pinnacles, CA
- 1.9 4km NNE of Pinnacles, CA
- 1.6 26km SSW of Los Banos, CA
- 1.9 11km ENE of Pinnacles, CA
- 2.0 2km N of Pinnacles, CA
- 1.8 2km N of Pinnacles, CA
- 1.8 3km NE of Pinnacles, CA
- 1.6 4km NNE of Pinnacles, CA
- 1.6 5km NNE of Pinnacles, CA
- 2.5 19km SE of Pinnacles, 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.