Earthquake · reviewed by a seismologist
M 1.9md
Earthquake near Orinda, CA
No earthquake was likely felt in Orinda in the 24 hours to 5:06 am PST (13:06 UTC). The last one was M 2.1, 12 km (8 mi) NE, at 4:05 am PST on 8 November 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near Orinda
This page: a magnitude 1.9 earthquake was recorded 3 km (2 mi) northeast of Orinda, CA, at 11:02 pm PDT on 2 June 2018 (06:02 UTC), 14 km deep.
USGS: 3km NE of Orinda, CA
26 km (16 mi) ENE of San Francisco, CA · 11 km (7 mi) W of Walnut Creek, CA
- When
- 11:02 pm PDT on 2 June 2018 ()
- Where
- 3 km (2 mi) northeast of Orinda, CA · earthquakes near Orinda
- Magnitude
- M 1.9 (md)
- Depth
- 14 km below the surface
- Felt
- no reports yet
- Nearest
- Contra Costa County, 19 km E
- Nearest mapped fault
- Hayward fault, 8 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 3082 days ago
Earthquake alerts for Orinda, CA
Get a notification in this browser when USGS records an earthquake near Orinda, CA. No account or email needed.
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 6 km (4 mi) from the epicentre. In Orinda, 3 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: Orinda 3 km, intensity II · Lafayette 4 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 21 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 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- This earthquake M 1.9 about 21 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 5,200 times the energy of this one.
Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:
- 7.9 The 1906 San Francisco, California Earthquake · 38 km WSW of this epicentre
- 6.0 The 2014 South Napa, California Earthquake · 38 km NNW of this epicentre
- 5.8 The 1980 Livermore, California Earthquake · 35 km E of this epicentre
- 5.4 9 km NE of Livermore, California · 43 km ESE of this epicentre
- 5.3 The 1957 San Francisco, California Earthquake · 38 km SW 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 37.8953, -122.1608. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Contra Costa County, CA | 19 km (12 mi) | E | earthquakes near Contra Costa County |
| Alameda County, CA | 35 km (22 mi) | SE | earthquakes near Alameda County |
| Solano County, CA | 46 km (28 mi) | NNE | earthquakes near Solano County |
| Marin County, CA | 54 km (34 mi) | WNW | earthquakes near Marin County |
| San Mateo County, CA | 57 km (35 mi) | SSW | earthquakes near San Mateo County |
| Napa County, CA | 70 km (43 mi) | NNW | earthquakes near Napa 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.
- 2.0 1km S of Pleasant Hill, CA
- 1.5 2km WSW of San Lorenzo, CA
- 3.3 2km NNW of Crockett, CA
- 2.1 5km E of Union City, CA
- 1.6 6km SSW of Stinson Beach, CA
- 1.5 3km NNW of Orinda, CA
- 2.5 9km N of Bay Point, CA
- 1.8 2km E of Alamo, CA
- 1.5 2km E of Alamo, CA
- 1.6 0km E of Pacifica, CA
- 1.9 9km S of Muir Beach, CA
- 1.6 9km ENE of Blackhawk, CA
- 1.7 2km SW of Concord, CA
- 2.1 2km SSW of Dublin, CA
- 2.3 5km ESE of Blackhawk, 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.