quarry blast · reviewed by a seismologist
M 1.5ml
6km NNW of Lakeside, CA
- When
- Magnitude
- M 1.5 (ml)
- Depth
- -0.2 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 21 km NE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1665 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 5.7 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 2,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.7 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.
Where
Epicentre 32.9040, -116.9487. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| San Diego County, CA | 21 km (13 mi) | SW of here | earthquakes near San Diego County |
| Orange County, CA | 115 km (72 mi) | SE of here | earthquakes near Orange County |
| Riverside County, CA | 127 km (79 mi) | SW of here | earthquakes near Riverside County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
49 earthquakes have been recorded within 50 km since this one.
- 1.7 3km SSE of Lake Henshaw, CA
- 1.5 2km SSE of Lake Henshaw, CA
- 1.6 3km SSE of Lake Henshaw, CA
- 1.9 8km N of Lake Henshaw, CA
- 1.9 2km WSW of Lake Henshaw, CA
- 1.5 11km NE of Julian, CA
- 1.6 3km SSE of Lake Henshaw, CA
- 1.5 9km N of Julian, CA
- 1.6 9km N of Julian, CA
- 1.6 9km N of Julian, CA
- 2.0 9km N of Julian, CA
- 2.0 3km SSE of Lake Henshaw, CA
- 1.6 5km NNE of San Ysidro, CA
- 2.4 12km E of Julian, CA
- 1.6 8km SW of San Ysidro, 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.
For this area
The largest earthquake within 50 km in our catalogue was M 4.0 on 2022-01-30 — it released about 5,200 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.