Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near San Luis Obispo, CA
No earthquake was likely felt in San Luis Obispo in the 24 hours to 3:43 am PST (11:43 UTC). The last one was M 2.5, 18 km (11 mi) NNW, at 11:41 pm PDT on 15 August 2026, estimated intensity II (weak) in town; 61 felt reports to USGS. Every earthquake near San Luis Obispo
This page: a magnitude 1.5 earthquake was recorded 4 km (3 mi) east of San Luis Obispo, CA, at 10:09 am PDT on 21 September 2022 (17:09 UTC), 6.6 km deep. 1 person has reported feeling it to USGS.
USGS: 4km E of San Luis Obispo, CA
42 km (26 mi) NNW of Santa Maria, CA · 143 km (89 mi) W of Bakersfield, CA
- When
- 10:09 am PDT on 21 September 2022 ()
- Where
- 4 km (3 mi) east of San Luis Obispo, CA · earthquakes near San Luis Obispo
- Magnitude
- M 1.5 (md)
- Depth
- 6.6 km below the surface
- Felt
- 1 report · strongest reported intensity I
- Nearest
- San Luis Obispo County, 19 km NE
- Nearest mapped fault
- Los Osos fault, 9 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 1513 days ago
Earthquake alerts for San Luis Obispo, CA
Get a notification in this browser when USGS records an earthquake near San Luis Obispo, 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 8 km (5 mi) from the epicentre. In San Luis Obispo, 4 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: Santa Margarita, Avila Beach, Pismo Beach, Grover Beach, Arroyo Grande, Los Osos.
How big was it?
This earthquake released about 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
- Around the size people start to feel M 3.0 160× the energy of this one
- This earthquake M 1.5 about 5.9 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 lists one earthquake of M5 or more within 50 km:
- 5.0 5 km SSW of Nipomo, California · 33 km SSE 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 35.2872, -120.6112. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Luis Obispo County, CA | 19 km (12 mi) | NE | earthquakes near San Luis Obispo County |
| Santa Barbara County, CA | 98 km (61 mi) | SSE | earthquakes near Santa Barbara County |
| Kings County, CA | 113 km (70 mi) | NE | earthquakes near Kings County |
| Monterey County, CA | 124 km (77 mi) | NNW | earthquakes near Monterey County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
39 earthquakes have been recorded within 50 km since this one.
- 1.5 5 km SE of Atascadero, CA
- 1.6 10 km NE of Cayucos, CA
- 1.6 12 km NNE of Cayucos, CA
- 1.9 10 km W of Atascadero, CA
- 2.4 10 km W of Templeton, CA
- 1.9 24 km ESE of Santa Margarita, CA
- 1.8 10km W of Orcutt, CA
- 1.9 10 km W of Atascadero, CA
- 1.8 8km W of Templeton, CA
- 1.5 9km E of San Luis Obispo, CA
- 1.9 9km ENE of Cayucos, CA
- 1.5 4km WNW of Templeton, CA
- 1.6 9km SSE of Baywood-Los Osos, CA
- 1.8 10km ESE of Shandon, CA
- 1.7 10km WSW of Atascadero, 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.