Earthquake · reviewed by a seismologist
M 3.7mw
Earthquake near Black Point-Green Point, CA
No earthquake was likely felt in Black Point-Green Point in the 24 hours to 2:46 am PST (10:46 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 3.7 earthquake was recorded 10 km (6 mi) east-southeast of Black Point-Green Point, CA, at 3:22 pm PDT on 30 July 2018 (22:22 UTC), 12 km deep. 4,337 people have reported feeling it to USGS.
USGS: 10km ESE of Black Point-Green Point, CA
12 km (8 mi) E of Novato, CA · 34 km (21 mi) N of San Francisco, CA
- When
- 3:22 pm PDT on 30 July 2018 ()
- Where
- 10 km (6 mi) east-southeast of Black Point-Green Point, CA · earthquakes near Black Point-Green Point
- Magnitude
- M 3.7 (mw)
- Depth
- 12 km below the surface
- Felt
- 4,337 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Marin County, 30 km W
- Nearest mapped fault
- Rodgers Creek 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 1787 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 72 km (45 mi) from the epicentre. In Black Point-Green Point, 10 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 10 km, intensity III · Hercules 13 km, intensity III · Pinole 13 km, intensity III · Vallejo 14 km, intensity III · Novato 14 km, intensity III · San Pablo 15 km, intensity III · San Rafael 16 km, intensity III · Richmond 17 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 4.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 36,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 1,600× the energy of this one
- Magna, Utah 2020 M 5.7 1,100× the energy of this one
- This earthquake M 3.7 about 4.7 tons of TNT
- Around the size people start to feel M 3.0 this one released 9.8× more
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 12 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 · 39 km SSW of this epicentre
- 6.0 The 2014 South Napa, California Earthquake · 17 km NNE of this epicentre
- 5.3 The 1957 San Francisco, California Earthquake · 47 km S of this epicentre
- 5.3 3 km E of Bloomfield, California · 43 km NW of this epicentre
- 5.3 Northern California · 45 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 38.0828, -122.4097. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Marin County, CA | 30 km (18 mi) | W | earthquakes near Marin County |
| Contra Costa County, CA | 44 km (27 mi) | ESE | earthquakes near Contra Costa County |
| Solano County, CA | 46 km (29 mi) | ENE | earthquakes near Solano County |
| Napa County, CA | 48 km (30 mi) | N | earthquakes near Napa County |
| Alameda County, CA | 65 km (41 mi) | SE | earthquakes near Alameda County |
| Sonoma County, CA | 67 km (41 mi) | NW | earthquakes near Sonoma County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
48 earthquakes have been recorded within 50 km since this one.
- 2.4 1km NW of Crockett, CA
- 1.6 2km NW of Crockett, CA
- 2.7 2km NW of Crockett, CA
- 3.5 2km NW of Crockett, CA
- 2.0 4km E of El Sobrante, CA
- 2.5 3km ESE of San Leandro, CA
- 1.6 2km W of Diablo, CA
- 1.6 4km NE of Vallejo, CA
- 1.5 4km NE of Saint Helena, CA
- 2.0 14km N of Pittsburg, CA
- 2.2 1km NNW of Alamo, CA
- 1.6 2km SW of Diablo, CA
- 1.6 7km NE of Rohnert Park, CA
- 1.7 7km NE of Rohnert Park, CA
- 2.2 5km E of Kenwood, 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.