Earthquake near San Francisco, CA

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 16 km (10 mi) from the epicentre. In San Francisco, 14 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.

Likely felt in: Daly City 8 km, intensity II · Pacifica 13 km, intensity II · San Francisco 14 km, intensity II · South San Francisco 15 km, intensity II · Bayview-Hunters Point 16 km, intensity II · San Bruno 16 km, intensity II. Estimated for each town centre; each link is that town's own record.

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.

1. Mineral, Virginia 2011 M 5.8 290,000× the energy of this one
2. Magna, Utah 2020 M 5.7 200,000× the energy of this one
3. Around the size people start to feel M 3.0 18× the energy of this one
4. 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

The largest earthquake within 50 km since 2016 was M 4.4 on 2018-01-04 — about 2,100 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

1. 7.9 The 1906 San Francisco, California Earthquake · 4 km N of this epicentre Apr 18, 1906
2. 5.3 The 1957 San Francisco, California Earthquake · 8 km SE of this epicentre Mar 22, 1957

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 37.7125, -122.5577. Map © OpenStreetMap contributors.

Nearby places

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

35 earthquakes have been recorded within 50 km since this one.

1. 1.7 7 km WNW of San Francisco Zoo, CA 12:29 UTC
2. 2.5 3 km NNW of Piedmont, CA 07:13 UTC
3. 1.8 6 km ESE of Santa Venetia, CA 18:31 UTC
4. 1.5 6 km NNE of Orinda, CA 04:31 UTC
5. 2.1 10 km WSW of San Lorenzo, CA 04:30 UTC
6. 1.7 2 km ENE of San Leandro, CA 15:09 UTC
7. 2.0 7 km NW of San Francisco Zoo, CA 00:35 UTC
8. 1.9 3 km ESE of South San Francisco, CA 14:33 UTC
9. 2.0 1 km E of Pacifica, CA 17:41 UTC
10. 2.3 1 km E of Pacifica, CA 16:54 UTC
11. 2.4 3 km WSW of Half Moon Bay, CA 01:40 UTC
12. 1.5 4 km ESE of Pacifica, CA 12:48 UTC
13. 2.1 4 km NNE of Fairview, CA 21:02 UTC
14. 1.5 10 km SSW of Half Moon Bay, CA 12:46 UTC
15. 1.8 10 km ESE of Black Point-Green Point, CA 20:14 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 06:19 UTC. 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.