quarry blast · reviewed by a seismologist
M 1.5ml
Earthquake near Lakeside, CA
No earthquake was likely felt in Lakeside in the 24 hours to 6:22 am PST (14:22 UTC). The last one was M 4.9, 170 km (106 mi) ESE, at 10:27 am PST on 3 November 2026, estimated intensity II (weak) in town; 321 felt reports to USGS. Every earthquake near Lakeside
No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 1.5 quarry blast was recorded 6 km (4 mi) north of Lakeside, CA, at 2:13 pm PDT on 19 August 2025 (21:13 UTC), less than 1 km deep.
USGS: 6 km N of Lakeside, CA
22 km (13 mi) ENE of San Diego, CA · 8 km (5 mi) NE of Santee, CA
- When
- 2:13 pm PDT on 19 August 2025 ()
- Where
- 6 km (4 mi) north of Lakeside, CA · earthquakes near Lakeside
- Magnitude
- M 1.5 (ml)
- Depth
- -0.2 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 19 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 448 days ago
Earthquake alerts for Lakeside, CA
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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 Lakeside, 6 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: 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 5.4 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 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 370,000 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 · 39 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 32.9127, -116.9348. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 19 km (12 mi) | NE | earthquakes near San Diego County |
| Orange County, CA | 115 km (72 mi) | NW | earthquakes near Orange County |
| Riverside County, CA | 126 km (78 mi) | NE | earthquakes near Riverside County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
35 earthquakes have been recorded within 50 km since this one.
- 1.8 11 km W of Pine Valley, CA
- 1.5 11 km W of Pine Valley, CA
- 1.5 4 km SE of Julian, CA
- 1.8 11 km W of Pine Valley, CA
- 1.8 11 km W of Pine Valley, CA
- 1.5 11 km W of Pine Valley, CA
- 1.6 2 km ESE of Lake Henshaw, CA
- 1.8 9 km NE of Julian, CA
- 1.6 11 km WSW of Pine Valley, CA
- 2.0 2 km ESE of Lake Henshaw, CA
- 1.7 11 km W of Pine Valley, CA
- 1.7 7 km ESE of San Diego Country Estates, CA
- 1.6 9 km NNE of Julian, CA
- 1.8 9 km NNE of Julian, CA
- 1.9 9 km NNE 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.
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.