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 4 km (2 mi) from the epicentre. In San Francisco, 43 km away, the estimate is intensity I (not felt). 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: Lagunitas-Forest Knolls, Inverness, Woodacre, Bolinas, Sleepy Hollow, Fairfax.

How big was it?

This earthquake released about 12 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.

1. Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
2. Magna, Utah 2020 M 5.7 900,000× the energy of this one
3. Around the size people start to feel M 3.0 80× the energy of this one
4. This earthquake M 1.7 about 12 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 2022-09-14 — about 9,800 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

1. 7.9 The 1906 San Francisco, California Earthquake · 38 km SSE of this epicentre Apr 18, 1906
2. 6.0 The 2014 South Napa, California Earthquake · 44 km ENE of this epicentre Aug 24, 2014
3. 5.3 The 1957 San Francisco, California Earthquake · 49 km SSE of this epicentre Mar 22, 1957
4. 5.3 3 km E of Bloomfield, California · 31 km N of this epicentre Oct 2, 1969
5. 5.3 Northern California · 31 km N of this epicentre Oct 2, 1969

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 38.0415, -122.7683. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.4 4 km W of Glen Ellen, CA 15:35 UTC
2. 1.8 3 km WNW of Boyes Hot Springs, CA 00:59 UTC
3. 1.8 10 km ESE of Black Point-Green Point, CA 20:14 UTC
4. 1.6 8 km SW of Napa, CA 06:54 UTC
5. 2.3 7 km SW of Napa, CA 06:45 UTC
6. 1.7 4 km W of San Francisco Zoo, CA 09:26 UTC
7. 1.5 6 km ESE of Santa Venetia, CA 18:45 UTC
8. 2.2 3 km N of Vallejo, CA 18:31 UTC
9. 1.6 4km WNW of San Francisco Zoo, CA 09:58 UTC
10. 1.6 7km S of Muir Beach, CA 15:03 UTC
11. 1.8 1km W of Dillon Beach, CA 19:28 UTC
12. 2.1 1km WNW of Kensington, CA 09:10 UTC
13. 1.7 2km ENE of Berkeley, CA 23:19 UTC
14. 2.0 7km E of Penngrove, CA 18:50 UTC
15. 2.2 5km WSW of San Francisco Zoo, CA 07:02 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:35 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.