Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Lagunitas-Forest Knolls, CA
No earthquake was likely felt in Lagunitas-Forest Knolls in the 24 hours to 5:05 am PST (13:05 UTC). The last one was M 2.4, 13 km (8 mi) NE, at 6:21 pm PDT on 26 September 2026, estimated intensity II (weak) in town. Every earthquake near Lagunitas-Forest Knolls
This page: a magnitude 1.6 earthquake was recorded 9 km (6 mi) west-southwest of Lagunitas-Forest Knolls, CA, at 6:41 pm PDT on 14 April 2025 (01:41 UTC), 8.3 km deep. 1 person has reported feeling it to USGS.
USGS: 9 km W of Lagunitas-Forest Knolls, CA
40 km (25 mi) NW of San Francisco, CA · 24 km (15 mi) WSW of Novato, CA
- When
- 6:41 pm PDT on 14 April 2025 ()
- Where
- 9 km (6 mi) west-southwest of Lagunitas-Forest Knolls, CA · earthquakes near Lagunitas-Forest Knolls
- Magnitude
- M 1.6 (md)
- Depth
- 8.3 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Marin County, 8 km NNE
- Nearest mapped fault
- San Andreas fault, 3 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 572 days ago
Earthquake alerts for Lagunitas-Forest Knolls, CA
Get a notification in this browser when USGS records an earthquake near Lagunitas-Forest Knolls, 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 7 km (4 mi) from the epicentre. In Lagunitas-Forest Knolls, 9 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: Bolinas, Woodacre, Inverness, Fairfax, Sleepy Hollow, Lucas Valley-Marinwood.
How big was it?
This earthquake released about 6.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
- Around the size people start to feel M 3.0 140× the energy of this one
- This earthquake M 1.6 about 6.8 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 4.4 on 2018-01-04 — about 16,000 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 7.9 The 1906 San Francisco, California Earthquake · 34 km SE of this epicentre
- 6.0 The 2014 South Napa, California Earthquake · 49 km ENE of this epicentre
- 5.3 The 1957 San Francisco, California Earthquake · 45 km SE of this epicentre
- 5.3 3 km E of Bloomfield, California · 36 km N of this epicentre
- 5.3 Northern California · 37 km N 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 37.9887, -122.7897. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Marin County, CA | 8 km (5 mi) | NNE | earthquakes near Marin County |
| San Francisco County, CA | 36 km (22 mi) | SW | earthquakes near San Francisco County |
| Sonoma County, CA | 61 km (38 mi) | NNW | earthquakes near Sonoma County |
| Napa County, CA | 70 km (44 mi) | NE | earthquakes near Napa County |
| San Mateo County, CA | 74 km (46 mi) | SSE | earthquakes near San Mateo County |
| Contra Costa County, CA | 74 km (46 mi) | E | earthquakes near Contra Costa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
36 earthquakes have been recorded within 50 km since this one.
- 1.9 2 km E of Berkeley, CA
- 2.0 2 km E of Berkeley, CA
- 1.7 2 km E of Berkeley, CA
- 2.3 2 km E of Berkeley, CA
- 3.0 2 km E of Berkeley, CA
- 1.9 2 km E of Berkeley, CA
- 1.8 2 km ENE of Rodeo, CA
- 1.5 2 km ENE of Berkeley, CA
- 1.7 3 km ESE of Berkeley, CA
- 2.0 3 km SE of Berkeley, CA
- 1.7 3 km ESE of Berkeley, CA
- 2.9 3 km SE of Berkeley, CA
- 2.6 3 km SE of Berkeley, CA
- 2.1 3 km ESE of Berkeley, CA
- 4.3 2 km ESE of Berkeley, 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.