Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Livermore, CA
No earthquake was likely felt in Livermore in the 24 hours to 12:53 am PST (08:53 UTC). The last one was M 2.1, 12 km (8 mi) SE, at 8:52 am PDT on 27 October 2026, estimated intensity II (weak) in town; 1 felt report to USGS. Every earthquake near Livermore
This page: a magnitude 1.5 earthquake was recorded 19 km (12 mi) south-southeast of Livermore, CA, at 7:02 pm PDT on 27 April 2020 (02:02 UTC), 3.9 km deep.
USGS: 19km SSE of Livermore, CA
29 km (18 mi) NNE of San Jose, CA · 19 km (12 mi) SSE of Livermore, CA
- When
- 7:02 pm PDT on 27 April 2020 ()
- Where
- 19 km (12 mi) south-southeast of Livermore, CA · earthquakes near Livermore
- Magnitude
- M 1.5 (md)
- Depth
- 3.9 km below the surface
- Felt
- no reports yet
- Nearest
- Alameda County, 25 km WNW
- Nearest mapped fault
- Greenville fault, 11 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 2382 days ago
Earthquake alerts for Livermore, CA
Get a notification in this browser when USGS records an earthquake near Livermore, 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 10 km (6 mi) from the epicentre. In Livermore, 19 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: East Foothills, Pleasanton, Milpitas, Fremont, San Jose.
How big was it?
This earthquake released about 6.2 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 2,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
- Around the size people start to feel M 3.0 150× the energy of this one
- This earthquake M 1.5 about 6.2 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 4.3 on 2019-07-16 — about 14,000 times the energy of this one.
Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:
- 6.5 Near Morgan Hill, California · 47 km S of this epicentre
- 6.2 Near San Jose, California · 28 km SSW of this epicentre
- 6.2 The 1984 Morgan Hill, California Earthquake · 24 km S of this epicentre
- 6.1 Near San Jose, California · 38 km SSW of this epicentre
- 5.8 The 1979 Coyote Lake, California Earthquake · 49 km SSE 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 37.5287, -121.6737. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Alameda County, CA | 25 km (15 mi) | WNW | earthquakes near Alameda County |
| Santa Clara County, CA | 34 km (21 mi) | S | earthquakes near Santa Clara County |
| Contra Costa County, CA | 50 km (31 mi) | NNW | earthquakes near Contra Costa County |
| San Joaquin County, CA | 57 km (36 mi) | NE | earthquakes near San Joaquin County |
| Stanislaus County, CA | 59 km (37 mi) | E | earthquakes near Stanislaus County |
| San Mateo County, CA | 63 km (39 mi) | WSW | earthquakes near San Mateo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 1.6 3km ESE of Union City, CA
- 3.0 8km NE of Alum Rock, CA
- 2.5 11km SSW of Brentwood, CA
- 2.6 11km ENE of Milpitas, CA
- 1.8 9km NNE of Milpitas, CA
- 2.2 10km NE of Milpitas, CA
- 2.3 9km NE of Blackhawk, CA
- 2.2 6km E of Alum Rock, CA
- 1.6 15km E of Seven Trees, CA
- 1.5 4km WSW of Brentwood, CA
- 1.6 16km ESE of Alum Rock, CA
- 1.6 16km E of Seven Trees, CA
- 2.1 10km SW of Brentwood, CA
- 1.5 1km SSE of Pleasanton, CA
- 1.7 14km N of Morgan Hill, 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.