Earthquake · reviewed by a seismologist
M 2.2md
Earthquake near Pismo Beach, CA
No earthquake was likely felt in Pismo Beach in the 24 hours to 9:21 pm PST (05:21 UTC). The last one was M 1.6, 10 km (7 mi) NW, at 11:05 pm PDT on 7 June 2026, estimated intensity II (weak) in town. Every earthquake near Pismo Beach
This page: a magnitude 2.2 earthquake was recorded 4 km (3 mi) north-northeast of Pismo Beach, CA, at 7:04 pm PST on 9 December 2017 (03:04 UTC), less than 1 km deep.
USGS: 4km NNE of Pismo Beach, CA
31 km (19 mi) NNW of Santa Maria, CA
- When
- 7:04 pm PST on 9 December 2017 ()
- Where
- 4 km (3 mi) north-northeast of Pismo Beach, CA · earthquakes near Pismo Beach
- Magnitude
- M 2.2 (md)
- Depth
- -0.3 km below the surface
- Felt
- no reports yet
- Nearest
- San Luis Obispo County, 28 km NNE
- Nearest mapped fault
- Los Osos fault, 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 3258 days ago
Earthquake alerts for Pismo Beach, 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 18 km (11 mi) from the epicentre. In Pismo Beach, 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: Grover Beach, Arroyo Grande, Oceano, Avila Beach, San Luis Obispo, Callender.
How big was it?
This earthquake released about 52 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 290,000× the energy of this one
- Magna, Utah 2020 M 5.7 200,000× the energy of this one
- Around the size people start to feel M 3.0 18× the energy of this one
- This earthquake M 2.2 about 52 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 2 earthquakes of M5 or more within 50 km:
- 5.8 Near Los Alamos, California · 46 km SSE of this epicentre
- 5.0 5 km SSW of Nipomo, California · 22 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 35.1753, -120.6170. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Luis Obispo County, CA | 28 km (17 mi) | NNE | earthquakes near San Luis Obispo County |
| Santa Barbara County, CA | 88 km (55 mi) | SE | earthquakes near Santa Barbara County |
| Kings County, CA | 123 km (77 mi) | NE | earthquakes near Kings County |
| Monterey County, CA | 134 km (83 mi) | NNW | earthquakes near Monterey 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.
- 1.6 6km E of Atascadero, CA
- 1.9 8km WSW of Atascadero, CA
- 2.2 4km ESE of Orcutt, CA
- 1.6 12km NNE of Cayucos, CA
- 1.7 24km NE of Arroyo Grande, CA
- 2.4 4km ESE of Orcutt, CA
- 3.2 4km ESE of Orcutt, CA
- 1.5 4km ESE of Orcutt, CA
- 1.6 6km E of San Luis Obispo, CA
- 1.5 8km WNW of Templeton, CA
- 2.0 11km WSW of Templeton, CA
- 2.2 12km S of Guadalupe, CA
- 1.8 13km N of Cayucos, CA
- 2.6 12km W of Guadalupe, CA
- 1.6 7km E 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.