Earthquake · reviewed by a seismologist
M 2.8md
Earthquake near Black Point-Green Point, CA
No earthquake was likely felt in Black Point-Green Point in the 24 hours to 10:12 am PST (18:12 UTC). The last one was M 2.4, 6 km (4 mi) WSW, at 6:21 pm PDT on 26 September 2026, estimated intensity II (weak) in town. Every earthquake near Black Point-Green Point
This page: a magnitude 2.8 earthquake was recorded 9 km (6 mi) east-southeast of Black Point-Green Point, CA, at 4:27 am PDT on 27 March 2019 (11:27 UTC), 11 km deep. 18 people have reported feeling it to USGS.
USGS: 9km ESE of Black Point-Green Point, CA
12 km (7 mi) E of Novato, CA · 35 km (22 mi) N of San Francisco, CA
- When
- 4:27 am PDT on 27 March 2019 ()
- Where
- 9 km (6 mi) east-southeast of Black Point-Green Point, CA · earthquakes near Black Point-Green Point
- Magnitude
- M 2.8 (md)
- Depth
- 11 km below the surface
- Felt
- 18 reports · strongest reported intensity III
- Nearest
- Marin County, 29 km W
- Nearest mapped fault
- Rodgers Creek fault, 7 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 2785 days ago
Earthquake alerts for Black Point-Green Point, CA
Get a notification in this browser when USGS records an earthquake near Black Point-Green Point, 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 24 km (15 mi) from the epicentre. In Black Point-Green Point, 9 km away, the estimate is intensity III (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: Black Point-Green Point 9 km, intensity III · Hercules 14 km, intensity II · Vallejo 14 km, intensity II · Novato 14 km, intensity II · Pinole 14 km, intensity II · San Pablo 16 km, intensity II · San Rafael 17 km, intensity II · Crockett 18 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 460 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 33,000× the energy of this one
- Magna, Utah 2020 M 5.7 23,000× the energy of this one
- Around the size people start to feel M 3.0 2.1× the energy of this one
- This earthquake M 2.8 about 460 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 240 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 7.9 The 1906 San Francisco, California Earthquake · 40 km SSW of this epicentre
- 6.0 The 2014 South Napa, California Earthquake · 16 km NNE of this epicentre
- 5.3 The 1957 San Francisco, California Earthquake · 48 km S of this epicentre
- 5.3 3 km E of Bloomfield, California · 42 km NW of this epicentre
- 5.3 Northern California · 44 km NW 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 38.0912, -122.4133. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Marin County, CA | 29 km (18 mi) | W | earthquakes near Marin County |
| Contra Costa County, CA | 45 km (28 mi) | ESE | earthquakes near Contra Costa County |
| Solano County, CA | 46 km (28 mi) | ENE | earthquakes near Solano County |
| Napa County, CA | 47 km (29 mi) | N | earthquakes near Napa County |
| Sonoma County, CA | 66 km (41 mi) | NW | earthquakes near Sonoma County |
| Alameda County, CA | 66 km (41 mi) | SE | earthquakes near Alameda County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.6 2km E of Berkeley, CA
- 2.0 3km SSW of Alameda, CA
- 2.1 5km ENE of Kenwood, CA
- 2.5 3km N of San Leandro, CA
- 1.6 4km ESE of Moraga, CA
- 1.5 3km NE of Alamo, CA
- 2.0 9km N of Pittsburg, CA
- 1.8 11km N of Bay Point, CA
- 1.5 2km SW of Clayton, CA
- 2.2 6km WSW of Yountville, CA
- 1.6 1km W of Concord, CA
- 1.8 2km SSW of Diablo, CA
- 1.5 2km SSW of Diablo, CA
- 2.3 3km ESE of Berkeley, CA
- 1.5 3km ESE of Berkeley, 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.