Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near Riverdale, CA
No earthquake was likely felt in Riverdale in the 24 hours to 5:45 am PST (13:45 UTC). The last one was M 3.3, 38 km (24 mi) S, at 6:21 am PDT on 4 August 2026, estimated intensity II (weak) in town; 2 felt reports to USGS. Every earthquake near Riverdale
This page: a magnitude 2.1 earthquake was recorded 6 km (4 mi) south-southeast of Riverdale, CA, at 2:58 pm PDT on 29 July 2022 (21:58 UTC), 17 km deep.
USGS: 6km SSE of Riverdale, CA
44 km (27 mi) S of Fresno, CA · 17 km (10 mi) WNW of Hanford, CA
- When
- 2:58 pm PDT on 29 July 2022 ()
- Where
- 6 km (4 mi) south-southeast of Riverdale, CA · earthquakes near Riverdale
- Magnitude
- M 2.1 (md)
- Depth
- 17 km below the surface
- Felt
- no reports yet
- Nearest
- Kings County, 35 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1566 days ago
Earthquake alerts for Riverdale, 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 4 km (2 mi) from the epicentre. In Riverdale, 6 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: Lemoore, Armona, Laton, Lucerne, Lemoore Station, Caruthers.
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 4.0 on 2018-11-27 — about 760 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 6.7 The 1983 Coalinga, California Earthquake · 47 km WSW of this epicentre
- 5.6 8 km SW of Huron, California · 40 km SW of this epicentre
- 5.5 11 km NNE of Coalinga, California · 45 km WSW of this epicentre
- 5.5 11 km NE of Coalinga, California · 44 km WSW of this epicentre
- 5.2 12 km NNE of Coalinga, California · 45 km WSW 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 36.3860, -119.8283. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Kings County, CA | 35 km (22 mi) | S | earthquakes near Kings County |
| Fresno County, CA | 44 km (28 mi) | NNE | earthquakes near Fresno County |
| Madera County, CA | 92 km (57 mi) | N | earthquakes near Madera County |
| Tulare County, CA | 95 km (59 mi) | E | earthquakes near Tulare County |
| San Benito County, CA | 115 km (72 mi) | WNW | earthquakes near San Benito County |
| Merced County, CA | 120 km (75 mi) | NW | earthquakes near Merced County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
37 earthquakes have been recorded within 50 km since this one.
- 1.7 10km E of Coalinga, CA
- 2.7 10km E of Coalinga, CA
- 1.6 11km E of Coalinga, CA
- 2.0 11km E of Coalinga, CA
- 3.3 11km E of Coalinga, CA
- 1.9 10km E of Coalinga, CA
- 2.5 10km ESE of Coalinga, CA
- 1.6 10km NE of Coalinga, CA
- 2.2 8km NW of Avenal, CA
- 1.8 10km SW of Huron, CA
- 2.0 9km E of Kettleman City, CA
- 1.6 9km W of Huron, CA
- 2.5 6km S of Armona, CA
- 1.6 6km S of Kettleman City, CA
- 1.9 4km SE of Kettleman City, 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.