Earthquake near Pleasant Hill, 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 12 km (7 mi) from the epicentre. 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: Pleasant Hill in town, intensity II · Pacheco 4 km, intensity II · Walnut Creek 5 km, intensity II · Concord 5 km, intensity II · Lafayette 8 km, intensity II · Martinez 9 km, intensity II · Alamo 12 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 30 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 500,000× the energy of this one
2. Magna, Utah 2020 M 5.7 350,000× the energy of this one
3. Around the size people start to feel M 3.0 32× the energy of this one
4. This earthquake M 2.0 about 30 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 4,900 times the energy of this one.

Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:

1. 7.9 The 1906 San Francisco, California Earthquake · 47 km WSW of this epicentre Apr 18, 1906
2. 6.0 The 2014 South Napa, California Earthquake · 36 km NW of this epicentre Aug 24, 2014
3. 5.8 The 1980 Livermore, California Earthquake · 29 km ESE of this epicentre Jan 24, 1980
4. 5.4 South of Elmira, California · 42 km NNE of this epicentre May 19, 1902
5. 5.4 9 km NE of Livermore, California · 39 km SE of this epicentre Jan 27, 1980

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 37.9487, -122.0733. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.6 2km ENE of Pleasant Hill, CA 04:44 UTC
2. 2.4 2km E of Berkeley, CA 18:09 UTC
3. 2.6 4km ESE of Berkeley, CA 12:51 UTC
4. 2.0 7km S of Livermore, CA 17:06 UTC
5. 1.9 7km S of Livermore, CA 16:52 UTC
6. 2.1 4km ESE of Berkeley, CA 18:49 UTC
7. 1.7 1km SW of Diablo, CA 11:25 UTC
8. 2.0 6km S of Livermore, CA 01:42 UTC
9. 2.2 7km S of Livermore, CA 00:06 UTC
10. 1.6 3km SW of Clayton, CA 17:13 UTC
11. 2.1 8km WSW of Mountain House, CA 00:05 UTC
12. 2.1 10km ESE of Livermore, CA 11:02 UTC
13. 1.6 3km ENE of Oakland, CA 08:12 UTC
14. 1.6 8km WSW of Mountain House, CA 00:02 UTC
15. 2.2 3km ENE of Walnut Creek, CA 02:19 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 06:54 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.