Earthquake · reviewed by a seismologist
M 2.3md
Earthquake near Big Pine, CA
No earthquake was likely felt in Big Pine in the 24 hours to 12:25 pm PST (20:25 UTC). The last one was M 1.6, 9 km (6 mi) NNE, at 10:07 am PST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near Big Pine
This page: a magnitude 2.3 earthquake was recorded 23 km (14 mi) southwest of Big Pine, CA, at 3:34 pm PDT on 31 March 2021 (22:34 UTC), 7.1 km deep. 1 person has reported feeling it to USGS.
USGS: 22km SW of Big Pine, CA
- When
- 3:34 pm PDT on 31 March 2021 ()
- Where
- 23 km (14 mi) southwest of Big Pine, CA · earthquakes near Big Pine
- Magnitude
- M 2.3 (md)
- Depth
- 7.1 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Tulare County, 91 km SSW
- Nearest mapped fault
- Southern Sierra Nevada fault, 8 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 2052 days ago
Earthquake alerts for Big Pine, CA
Get a notification in this browser when USGS records an earthquake near Big Pine, 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 18 km (11 mi) from the epicentre. In Big Pine, 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.
How big was it?
This earthquake released about 77 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 5.8 200,000× the energy of this one
- Magna, Utah 2020 M 5.7 140,000× the energy of this one
- Around the size people start to feel M 3.0 12× the energy of this one
- This earthquake M 2.3 about 77 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 4.8 on 2016-02-16 — about 5,600 times the energy of this one.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 6.0 Near Bishop, California · 36 km N of this epicentre
- 5.5 4 km SSW of Bishop, California · 36 km N of this epicentre
- 5.5 10 km N of Independence, California · 25 km ESE of this epicentre
- 5.5 2 km NW of Round Valley, California · 50 km NNW 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 37.0047, -118.4452. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Tulare County, CA | 91 km (57 mi) | SSW | earthquakes near Tulare County |
| Inyo County, CA | 105 km (65 mi) | ESE | earthquakes near Inyo County |
| Mono County, CA | 108 km (67 mi) | NNW | earthquakes near Mono County |
| Fresno County, CA | 111 km (69 mi) | WSW | earthquakes near Fresno County |
| Esmeralda County, NV | 112 km (70 mi) | NE | earthquakes near Esmeralda County |
| Madera County, CA | 118 km (73 mi) | WNW | earthquakes near Madera County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
44 earthquakes have been recorded within 50 km since this one.
- 1.5 7km NW of West Bishop, CA
- 2.7 6km NE of Round Valley, CA
- 2.3 19km S of Big Pine, CA
- 1.9 20km S of Big Pine, CA
- 2.1 18km S of Big Pine, CA
- 3.5 20km S of Big Pine, CA
- 1.7 5km ENE of Round Valley, CA
- 2.5 2km W of Round Valley, CA
- 1.8 2km W of Round Valley, CA
- 1.9 5km S of Round Valley, CA
- 1.5 23 km E of Big Pine, California
- 2.1 29km E of Big Pine, CA
- 1.7 17km NNE of Independence, CA
- 1.8 17km NNE of Independence, CA
- 2.4 19km WSW of Wilkerson, 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.