quarry blast · reviewed by a seismologist
M 1.5ml
Earthquake near Lakeside, CA
USGS: 6km NNW of Lakeside, CA
21 km (13 mi) ENE of San Diego, CA · 7 km (5 mi) NE of Santee, CA
- When
- 1:36 pm PST on 3 January 2018 ()
- Where
- 6 km (4 mi) NNW of Lakeside, CA · earthquakes near Lakeside
- Magnitude
- M 1.5 (ml)
- Depth
- -0.2 km below the surface
- Felt
- 4 reports · strongest reported intensity II
- Nearest
- San Diego County, 20 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3194 days ago
A magnitude 1.5 earthquake was recorded 6 km (4 mi) NNW of Lakeside, CA, at 1:36 pm PST on 3 January 2018 (21:36 UTC). 4 people have reported feeling it to USGS. 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 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
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 · 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 32.9093, -116.9407. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 20 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
44 earthquakes have been recorded within 50 km since this one.
- 1.8 6km N of La Jolla, CA
- 2.3 6km NNW of La Jolla, CA
- 1.6 6km WNW of Lake Henshaw, CA
- 1.5 7km WNW of Lake Henshaw, CA
- 1.6 6km NNW of Lakeside, CA
- 1.7 12km NNE of San Diego Country Estates, CA
- 1.6 16km SW of La Jolla, CA
- 1.8 7km NW of Lake Henshaw, CA
- 2.4 17km ESE of Julian, CA
- 1.6 2km SW of Lake Henshaw, CA
- 2.0 6km WNW of Lake Henshaw, CA
- 1.7 5km SW of San Ysidro, CA
- 1.5 1km SW of Lake Henshaw, CA
- 1.5 6km WNW of Lake Henshaw, CA
- 1.6 13km NNW of Tecate, B.C., MX
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.