Earthquake · reviewed by a seismologist
M 2.0md
Earthquake near Discovery Bay, CA
No earthquake was likely felt in Discovery Bay in the 24 hours to 12:39 pm PST (20:39 UTC). The last one was M 3.5, 56 km (35 mi) SSE, at 7:21 am PDT on 27 September 2026, estimated intensity II (weak) in town; 8 felt reports to USGS. Every earthquake near Discovery Bay
This page: a magnitude 2.0 earthquake was recorded 2 km (2 mi) south of Discovery Bay, CA, at 7:00 am PST on 19 January 2019 (15:00 UTC), 16 km deep.
USGS: 2km S of Discovery Bay, CA
12 km (7 mi) ESE of Brentwood, CA · 68 km (42 mi) NNE of San Jose, CA
- When
- 7:00 am PST on 19 January 2019 ()
- Where
- 2 km (2 mi) south of Discovery Bay, CA · earthquakes near Discovery Bay
- Magnitude
- M 2.0 (md)
- Depth
- 16 km below the surface
- Felt
- no reports yet
- Nearest
- San Joaquin County, 29 km E
- Nearest mapped fault
- Greenville fault, 19 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 2793 days ago
Earthquake alerts for Discovery Bay, CA
Get a notification in this browser when USGS records an earthquake near Discovery Bay, 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 it was probably too small to be felt, even directly above it. In Discovery Bay, 2 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.
Earthquakes near other towns within 30 km: Byron, Brentwood, Knightsen, Mountain House, Bethel Island, Oakley.
How big was it?
This earthquake released about 29 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 520,000× the energy of this one
- Magna, Utah 2020 M 5.7 370,000× the energy of this one
- Around the size people start to feel M 3.0 33× the energy of this one
- This earthquake M 2.0 about 29 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 5.8 The 1980 Livermore, California Earthquake · 16 km WSW of this epicentre
- 5.7 15 km NE of East Foothills, California · 46 km S of this epicentre
- 5.4 9 km NE of Livermore, California · 18 km SSW of this epicentre
- 5.1 11 km E of Blackhawk, California · 18 km WSW 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 37.8865, -121.5995. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Joaquin County, CA | 29 km (18 mi) | E | earthquakes near San Joaquin County |
| Contra Costa County, CA | 31 km (19 mi) | W | earthquakes near Contra Costa County |
| Alameda County, CA | 38 km (24 mi) | SW | earthquakes near Alameda County |
| Solano County, CA | 52 km (32 mi) | NW | earthquakes near Solano County |
| Stanislaus County, CA | 64 km (40 mi) | SE | earthquakes near Stanislaus County |
| Sacramento County, CA | 67 km (41 mi) | NNE | earthquakes near Sacramento 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.
- 1.8 2km NE of San Ramon, CA
- 1.8 2km NE of San Ramon, CA
- 2.0 9km N of Pittsburg, CA
- 1.8 11km N of Bay Point, CA
- 1.5 2km SW of Clayton, CA
- 1.6 1km W of Concord, CA
- 2.4 15km NE of Alum Rock, CA
- 1.6 13km SW of Byron, CA
- 1.8 2km SSW of Diablo, CA
- 1.5 2km SSW of Diablo, CA
- 2.1 13km WSW of Byron, CA
- 3.2 12km WSW of Byron, CA
- 4.3 12km WSW of Byron, CA
- 1.7 9km WSW of Mountain House, CA
- 2.1 8km WSW of Mountain House, 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.