quarry blast · reviewed by a seismologist
M 1.2ml
Earthquake near Lakeside, CA
USGS: 6 km NNW of Lakeside, CA
21 km (13 mi) ENE of San Diego, CA · 7 km (4 mi) NNE of Santee, CA
- When
- 12:58 pm PDT on 30 September 2026 ()
- Where
- 6 km (4 mi) NNW of Lakeside, CA · earthquakes near Lakeside
- Magnitude
- M 1.2 (ml)
- Depth
- -0.2 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 20 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2 days ago
A magnitude 1.2 earthquake was recorded 6 km (4 mi) NNW of Lakeside, CA, at 12:58 pm PDT on 30 September 2026 (19:58 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Eucalyptus Hills, Santee, Winter Gardens, Poway, Bostonia, Granite Hills.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 7,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 5,400,000× the energy of this one
- Around the size people start to feel M 3.0 480× the energy of this one
- This earthquake M 1.2 about 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 5.2 on 2025-04-14 — about 1,000,000 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.0 16 km NW of Julian, California · 40 km NE 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 32.9105, -116.9465. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 20 km (13 mi) | NE | earthquakes near San Diego County |
| Orange County, CA | 115 km (71 mi) | NW | earthquakes near Orange County |
| Riverside County, CA | 126 km (79 mi) | NE | earthquakes near Riverside County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 0.9 11 km SSE of Warner Springs, CA
- 1.3 9 km W of Tecate, B.C., MX
- 1.6 16 km ESE of Julian, CA
- 0.3 12 km NE of Julian, 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| event type | earthquake | quarry blast | |
| review status | automatic | reviewed | |
| longitude | -116.96 | -116.95 | |
| latitude | 32.91 | 32.91 | |
| depth | 3.58 | -0.17 | |
| magnitude | 1.25 | 1.21 | |
| longitude | -116.95 | -116.96 | |
| latitude | 32.91 | 32.91 | |
| depth | 2.83 | 3.58 | |
| magnitude | 1.36 | 1.25 |
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.