Earthquake · reviewed by a seismologist
M 3.5ml
Earthquake near San Diego, CA
No earthquake was likely felt in San Diego in the 24 hours to 7:48 am PST (15:48 UTC). The last one was M 4.7, 152 km (95 mi) E, at 12:10 am PDT on 10 May 2026, estimated intensity II (weak) in town; 203 felt reports to USGS. Every earthquake near San Diego
This page: a magnitude 3.5 earthquake was recorded 37 km (23 mi) west-southwest of San Diego, CA, at 1:11 am PDT on 20 June 2018 (08:11 UTC), 18 km deep. 35 people have reported feeling it to USGS.
USGS: 35km WSW of Coronado, CA
44 km (28 mi) WSW of San Diego, CA · 42 km (26 mi) W of National City, CA
- When
- 1:11 am PDT on 20 June 2018 ()
- Where
- 37 km (23 mi) west-southwest of San Diego, CA · earthquakes near San Diego
- Magnitude
- M 3.5 (ml)
- Depth
- 18 km below the surface
- Felt
- 35 reports · strongest reported intensity III
- Measured shaking
- intensity II (ShakeMap)
- Nearest
- San Diego County, 85 km ENE
- Nearest mapped fault
- San Diego Trough fault, 1 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 2976 days ago
Earthquake alerts for San Diego, CA
Get a notification in this browser when USGS records an earthquake near San Diego, 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 58 km (36 mi) from the epicentre. In San Diego, 37 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: San Diego 37 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 2.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 72,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 3,200× the energy of this one
- Magna, Utah 2020 M 5.7 2,300× the energy of this one
- This earthquake M 3.5 about 2.3 tons of TNT
- Around the size people start to feel M 3.0 this one released 4.9× 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
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 32.6068, -117.5407. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 85 km (53 mi) | ENE | earthquakes near San Diego County |
| Orange County, CA | 121 km (75 mi) | N | earthquakes near Orange 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.
- 2.2 16km SW of La Jolla, CA
- 1.8 49km WSW of Carlsbad, CA
- 1.9 40km WSW of Rosarito, B.C., MX
- 1.7 3km ESE of La Jolla, CA
- 2.4 17km SW of La Jolla, CA
- 1.7 12km WSW of Coronado, CA
- 2.2 4km WSW of Solana Beach, CA
- 1.6 4km NNE of San Ysidro, CA
- 1.7 16km W of Coronado, CA
- 1.5 24km W of Rosarito, B.C., MX
- 1.9 16km WSW of La Jolla, CA
- 1.5 5km SE of Chula Vista, CA
- 2.2 52km WSW of Rosarito, B.C., MX
- 1.6 16km SW of La Jolla, CA
- 2.2 41km WSW of Carlsbad, 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.