Earthquake · reviewed by a seismologist
M 1.9md
Earthquake near Moraga, CA
No earthquake was likely felt in Moraga in the 24 hours to 6:09 am PST (14:09 UTC). The last one was M 2.1, 13 km (8 mi) NNE, at 4:05 am PST on 8 November 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near Moraga
This page: a magnitude 1.9 earthquake was recorded 5 km (3 mi) east-southeast of Moraga, CA, at 4:34 pm PDT on 29 April 2022 (23:34 UTC), 12 km deep.
USGS: 5km ESE of Moraga, CA
14 km (8 mi) ENE of Oakland, CA · 11 km (7 mi) SSW of Walnut Creek, CA
- When
- 4:34 pm PDT on 29 April 2022 ()
- Where
- 5 km (3 mi) east-southeast of Moraga, CA · earthquakes near Moraga
- Magnitude
- M 1.9 (md)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Contra Costa County, 17 km NE
- Nearest mapped fault
- Calaveras fault, 5 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 1654 days ago
Earthquake alerts for Moraga, 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, people at rest would likely notice it out to about 8 km (5 mi) from the epicentre. In Moraga, 5 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: Alamo 6 km, intensity II · Danville 7 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 790,000× the energy of this one
- Magna, Utah 2020 M 5.7 560,000× the energy of this one
- Around the size people start to feel M 3.0 50× the energy of this one
- This earthquake M 1.9 about 19 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 7,700 times the energy of this one.
Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:
- 7.9 The 1906 San Francisco, California Earthquake · 42 km W of this epicentre
- 6.0 The 2014 South Napa, California Earthquake · 49 km NNW of this epicentre
- 5.8 The 1980 Livermore, California Earthquake · 28 km E of this epicentre
- 5.5 6 km NNE of East Foothills, California · 50 km SSE of this epicentre
- 5.4 9 km NE of Livermore, California · 34 km ESE 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 37.8097, -122.0797. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Contra Costa County, CA | 17 km (10 mi) | NE | earthquakes near Contra Costa County |
| Alameda County, CA | 23 km (14 mi) | SE | earthquakes near Alameda County |
| San Mateo County, CA | 51 km (32 mi) | SSW | earthquakes near San Mateo County |
| Solano County, CA | 52 km (33 mi) | NNE | earthquakes near Solano County |
| Marin County, CA | 64 km (40 mi) | WNW | earthquakes near Marin County |
| San Joaquin County, CA | 72 km (45 mi) | ENE | earthquakes near San Joaquin County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
51 earthquakes have been recorded within 50 km since this one.
- 1.7 11km SE of Livermore, CA
- 1.8 12km SE of Livermore, CA
- 1.9 4km W of Pleasant Hill, CA
- 1.8 11km NE of Milpitas, CA
- 1.8 2km E of Walnut Creek, CA
- 1.5 4km WNW of Orinda, CA
- 1.6 6km WNW of Dublin, CA
- 1.9 3km SW of American Canyon, CA
- 1.7 3km ESE of Pacifica, CA
- 1.9 3km ESE of Pacifica, CA
- 1.8 3km ESE of Pacifica, CA
- 1.7 1km W of Pacifica, CA
- 2.2 1km WSW of Pacifica, CA
- 2.5 4km SSE of Rodeo, CA
- 1.8 2km SSE of Alamo, 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.