Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near San Francisco, CA
No earthquake was likely felt in San Francisco in the 24 hours to 11:04 pm PST (07:04 UTC). The last one was M 2.6, 18 km (11 mi) ENE, at 6:23 pm PST on 1 November 2026, estimated intensity II (weak) in town; 114 felt reports to USGS. Every earthquake near San Francisco
This page: a magnitude 1.7 earthquake was recorded 12 km (8 mi) west of San Francisco, CA, at 10:31 pm PST on 4 March 2026 (06:31 UTC), 13 km deep.
USGS: 5 km WNW of San Francisco Zoo, CA
12 km (8 mi) WSW of San Francisco, CA · 10 km (6 mi) NW of Daly City, CA
- When
- 10:31 pm PST on 4 March 2026 ()
- Where
- 12 km (8 mi) west of San Francisco, CA · earthquakes near San Francisco
- Magnitude
- M 1.7 (md)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Nearest
- Marin County, 37 km NNW
- Nearest mapped fault
- San Andreas fault, under 1 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 244 days ago
Earthquake alerts for San Francisco, 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 it was probably too small to be felt, even directly above it. In San Francisco, 12 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: Daly City, Broadmoor, Colma, Sausalito, Marin City, Tamalpais-Homestead Valley.
How big was it?
This earthquake released about 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 100× the energy of this one
- This earthquake M 1.7 about 9.3 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 4.5 on 2019-10-15 — about 16,000 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 7.9 The 1906 San Francisco, California Earthquake · 1 km SE of this epicentre
- 5.3 The 1957 San Francisco, California Earthquake · 12 km SE 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 37.7550, -122.5578. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Marin County, CA | 37 km (23 mi) | NNW | earthquakes near Marin County |
| San Mateo County, CA | 41 km (26 mi) | SSE | earthquakes near San Mateo County |
| San Francisco County, CA | 42 km (26 mi) | W | earthquakes near San Francisco County |
| Contra Costa County, CA | 56 km (35 mi) | ENE | earthquakes near Contra Costa County |
| Alameda County, CA | 58 km (36 mi) | ESE | earthquakes near Alameda County |
| Solano County, CA | 79 km (49 mi) | NE | earthquakes near Solano County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.8 2 km WSW of Alamo, CA
- 3.6 3 km SW of Alamo, CA
- 1.6 2 km SW of Alamo, CA
- 1.7 2 km ESE of Pacifica, CA
- 1.8 3 km NNE of San Leandro, CA
- 1.6 4 km NE of San Leandro, CA
- 2.1 3 km SW of Alamo, CA
- 1.7 3 km WSW of Alamo, CA
- 1.5 3 km WSW of Alamo, CA
- 2.1 3 km WSW of Alamo, CA
- 2.0 3 km WSW of Alamo, CA
- 2.2 3 km SW of Alamo, CA
- 2.0 4 km NE of San Leandro, CA
- 1.6 2 km SE of East Richmond Heights, CA
- 1.6 3 km NW of Hercules, 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.