Earthquake · reviewed by a seismologist
M 2.3ml
Earthquake near Alta Sierra, CA
No earthquake was likely felt in Alta Sierra in the 24 hours to 1:09 pm PST (21:09 UTC). The last one was M 3.1, 14 km (9 mi) ESE, at 2:37 am PDT on 6 October 2026, estimated intensity III (weak) in town; 30 felt reports to USGS. Every earthquake near Alta Sierra
This page: a magnitude 2.3 earthquake was recorded 47 km (29 mi) north-northeast of Alta Sierra, CA, at 8:07 pm PST on 8 February 2022 (04:07 UTC), 7.5 km deep. 1 person has reported feeling it to USGS.
USGS: 42km WSW of Olancha, CA
54 km (33 mi) E of Porterville, CA · 103 km (64 mi) NNE of Bakersfield, CA
- When
- 8:07 pm PST on 8 February 2022 ()
- Where
- 47 km (29 mi) north-northeast of Alta Sierra, CA · earthquakes near Alta Sierra
- Magnitude
- M 2.3 (ml)
- Depth
- 7.5 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Tulare County, 32 km WNW
- Nearest mapped fault
- Kern Canyon fault, under 1 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 1737 days ago
Earthquake alerts for Alta Sierra, CA
Get a notification in this browser when USGS records an earthquake near Alta Sierra, CA. No account or email needed.
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 19 km (12 mi) from the epicentre. In Alta Sierra, 47 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 91 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 5.8 170,000× the energy of this one
- Magna, Utah 2020 M 5.7 120,000× the energy of this one
- Around the size people start to feel M 3.0 10× the energy of this one
- This earthquake M 2.3 about 91 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 4.2 on 2020-06-04 — about 580 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.0 5 km S of Springville, California · 35 km W 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 36.1425, -118.4435. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Tulare County, CA | 32 km (20 mi) | WNW | earthquakes near Tulare County |
| Kern County, CA | 92 km (57 mi) | SSW | earthquakes near Kern County |
| Inyo County, CA | 104 km (65 mi) | ENE | earthquakes near Inyo County |
| Fresno County, CA | 128 km (80 mi) | WNW | earthquakes near Fresno County |
| Madera County, CA | 166 km (103 mi) | NW | earthquakes near Madera County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
38 earthquakes have been recorded within 50 km since this one.
- 1.5 5km WNW of Wofford Heights, CA
- 1.7 2km SW of Olancha, CA
- 1.9 5km SE of Coso Junction, CA
- 2.0 5km SSE of Coso Junction, CA
- 1.7 19km WSW of Olancha, CA
- 1.7 26km SW of Olancha, CA
- 3.5 14km NW of Coso Junction, CA
- 1.6 19km WSW of Olancha, CA
- 2.1 19km WSW of Olancha, CA
- 1.8 19km WSW of Olancha, CA
- 2.9 19km WSW of Olancha, CA
- 1.8 7km WNW of Little Lake, CA
- 1.6 8km WNW of Olancha, CA
- 1.7 11km N of Coso Junction, CA
- 2.3 12km S of Olancha, 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.