Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near Bodega Bay, CA
No earthquake was likely felt in Bodega Bay in the 24 hours to 3:24 am PST (11:24 UTC). The last one was M 3.3, 35 km (21 mi) ENE, at 10:33 am PDT on 3 September 2026, estimated intensity II (weak) in town; 1,843 felt reports to USGS. Every earthquake near Bodega Bay
This page: a magnitude 2.1 earthquake was recorded 2 km (1 mi) south-southwest of Bodega Bay, CA, at 3:12 am PDT on 19 August 2021 (10:12 UTC), 10 km deep.
USGS: 2km SSW of Bodega Bay, CA
81 km (51 mi) NW of San Francisco, CA · 34 km (21 mi) WSW of Santa Rosa, CA
- When
- 3:12 am PDT on 19 August 2021 ()
- Where
- 2 km (1 mi) south-southwest of Bodega Bay, CA · earthquakes near Bodega Bay
- Magnitude
- M 2.1 (md)
- Depth
- 10 km below the surface
- Felt
- no reports yet
- Nearest
- Sonoma County, 26 km NNE
- Nearest mapped fault
- San Andreas 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 1901 days ago
Earthquake alerts for Bodega Bay, 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 13 km (8 mi) from the epicentre. In Bodega Bay, 2 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: Occidental, Camp Meeker, Monte Rio, Graton, Guerneville, Sebastopol.
How big was it?
This earthquake released about 38 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 5.8 390,000× the energy of this one
- Magna, Utah 2020 M 5.7 280,000× the energy of this one
- Around the size people start to feel M 3.0 25× the energy of this one
- This earthquake M 2.1 about 38 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:
- 5.3 3 km E of Bloomfield, California · 22 km E of this epicentre
- 5.3 Northern California · 20 km E 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 38.3130, -123.0568. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sonoma County, CA | 26 km (16 mi) | NNE | earthquakes near Sonoma County |
| Marin County, CA | 40 km (25 mi) | SE | earthquakes near Marin County |
| San Francisco County, CA | 65 km (40 mi) | S | earthquakes near San Francisco County |
| Napa County, CA | 67 km (42 mi) | ENE | earthquakes near Napa County |
| Lake County, CA | 92 km (57 mi) | NNE | earthquakes near Lake County |
| Solano County, CA | 98 km (61 mi) | E | earthquakes near Solano County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
33 earthquakes have been recorded within 50 km since this one.
- 1.6 8km ENE of Healdsburg, CA
- 2.1 5km WSW of Kenwood, CA
- 1.9 8km NE of Windsor, CA
- 1.6 4km N of Inverness, CA
- 1.6 5km NE of Larkfield-Wikiup, CA
- 1.5 6km W of Kenwood, CA
- 1.7 5km NE of Larkfield-Wikiup, CA
- 1.6 7km WSW of Lagunitas-Forest Knolls, CA
- 1.7 4km NNW of Larkfield-Wikiup, CA
- 2.1 8km SW of Calistoga, CA
- 2.5 7km SW of Calistoga, CA
- 1.9 6km NNE of Windsor, CA
- 1.9 10km ENE of Healdsburg, CA
- 2.4 4km S of Dillon Beach, CA
- 1.8 3km S of Dillon Beach, 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.