quarry blast · reviewed by a seismologist
M 1.8ml
Earthquake near Lakeside, CA
No earthquake was likely felt in Lakeside in the 24 hours to 6:54 am PST (14:54 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 1.8 quarry blast was recorded 7 km (4 mi) north-northwest of Lakeside, CA, at 2:58 pm PDT on 23 April 2019 (21:58 UTC), less than 1 km deep.
USGS: 7km NNW of Lakeside, CA
22 km (13 mi) ENE of San Diego, CA · 8 km (5 mi) NNE of Santee, CA
- When
- 2:58 pm PDT on 23 April 2019 ()
- Where
- 7 km (4 mi) north-northwest of Lakeside, CA · earthquakes near Lakeside
- Magnitude
- M 1.8 (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 2759 days ago
Earthquake alerts for Lakeside, CA
Get a notification in this browser when USGS records an earthquake near Lakeside, 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 13 km (8 mi) from the epicentre. In Lakeside, 7 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
- Magna, Utah 2020 M 5.7 840,000× the energy of this one
- Around the size people start to feel M 3.0 75× the energy of this one
- This earthquake M 1.8 about 13 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 one earthquake of M5 or more within 50 km:
- 5.0 16 km NW of Julian, California · 38 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 32.9190, -116.9390. 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 (71 mi) | NW | earthquakes near Orange County |
| Riverside County, CA | 125 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.
- 1.6 3km SE of Lake Henshaw, CA
- 1.8 8km ENE of Julian, CA
- 1.6 8km ENE of Julian, CA
- 1.7 4km ESE of Lake Henshaw, CA
- 2.4 17km SW of La Jolla, CA
- 1.9 8km ENE of Julian, CA
- 1.7 7km SE of Bonita, CA
- 1.7 8km S of Palomar Observatory, CA
- 1.5 9km ENE of Julian, CA
- 1.8 3km SE of Lake Henshaw, CA
- 1.7 2km SE of Lake Henshaw, CA
- 1.7 6km SSE of Lake Henshaw, CA
- 1.9 6km N of Lakeside, CA
- 1.7 12km WSW of Coronado, CA
- 2.2 4km WSW of Solana Beach, 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.