quarry blast · reviewed by a seismologist
M 1.5md
Earthquake near Vallejo, CA
No earthquake was likely felt in Vallejo in the 24 hours to 11:41 pm PST (07:41 UTC). The last one was M 1.8, 8 km (5 mi) ENE, at 11:09 am PST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near Vallejo
No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 1.5 quarry blast was recorded 7 km (4 mi) east of Vallejo, CA, at 12:53 pm PST on 13 February 2020 (20:53 UTC), less than 1 km deep.
USGS: 5km E of Vallejo, CA
7 km (5 mi) E of Vallejo, CA · 43 km (27 mi) NNE of San Francisco, CA
- When
- 12:53 pm PST on 13 February 2020 ()
- Where
- 7 km (4 mi) east of Vallejo, CA · earthquakes near Vallejo
- Magnitude
- M 1.5 (md)
- Depth
- -0.1 km below the surface
- Felt
- no reports yet
- Nearest
- Solano County, 27 km NE
- Nearest mapped fault
- Green Valley 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 2463 days ago
Earthquake alerts for Vallejo, CA
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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 10 km (6 mi) from the epicentre. In Vallejo, 7 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: Vallejo 7 km, intensity II · Benicia 8 km, intensity II · Crockett 8 km, intensity II. Estimated for each town centre; each link is that town's own record.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.7 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 26,000 times the energy of this one.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 6.0 The 2014 South Napa, California Earthquake · 16 km NW of this epicentre
- 5.8 The 1980 Livermore, California Earthquake · 47 km SE of this epicentre
- 5.4 South of Elmira, California · 32 km NE of this epicentre
- 5.1 11 km E of Blackhawk, California · 49 km SE 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 38.1160, -122.1785. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Solano County, CA | 27 km (17 mi) | NE | earthquakes near Solano County |
| Contra Costa County, CA | 30 km (18 mi) | SE | earthquakes near Contra Costa County |
| Napa County, CA | 45 km (28 mi) | NNW | earthquakes near Napa County |
| Marin County, CA | 50 km (31 mi) | W | earthquakes near Marin County |
| Alameda County, CA | 57 km (35 mi) | SSE | earthquakes near Alameda County |
| Yolo County, CA | 67 km (42 mi) | NNE | earthquakes near Yolo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
45 earthquakes have been recorded within 50 km since this one.
- 1.9 1km S of San Ramon, CA
- 1.8 11km NNW of Pittsburg, CA
- 1.9 2km NE of Danville, CA
- 1.9 8km SW of Brentwood, CA
- 2.0 7km SE of Blackhawk, CA
- 1.8 8km ESE of Blackhawk, CA
- 1.7 10km SW of Brentwood, CA
- 1.7 4km NW of Orinda, CA
- 1.9 3km E of Penngrove, CA
- 1.5 4km NNE of Fairview, CA
- 1.5 2km E of Berkeley, CA
- 1.6 2km S of Pittsburg, CA
- 1.9 5km NNE of Dublin, CA
- 1.9 14km W of Rio Vista, CA
- 2.0 15km N of Pittsburg, 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.