QuakeIndex

quarry blast · reviewed by a seismologist

M 1.8ml

6km N of Lakeside, CA

· -0.2 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 19 kmOrange County 116 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 1.8 (ml)
Depth
-0.2 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
San Diego County, 19 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2644 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 17 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.

  1. Mineral, Virginia 2011 M 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 32.9117, -116.9352. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 19 km (12 mi) SW of here earthquakes near San Diego County
Orange County, CA 116 km (72 mi) SE of here earthquakes near Orange County
Riverside County, CA 126 km (78 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

35 earthquakes have been recorded within 50 km since this one.

  1. 1.8 6km SE of Chula Vista, CA
  2. 1.5 3km ENE of Rancho San Diego, CA
  3. 2.3 2km SE of Lake Henshaw, CA
  4. 1.7 3km ESE of La Jolla, CA
  5. 2.3 8km NW of Julian, CA
  6. 1.5 6km ESE of Bonita, CA
  7. 1.6 3km SE of Lake Henshaw, CA
  8. 1.8 8km ENE of Julian, CA
  9. 1.6 8km ENE of Julian, CA
  10. 1.7 4km ESE of Lake Henshaw, CA
  11. 2.4 17km SW of La Jolla, CA
  12. 1.9 8km ENE of Julian, CA
  13. 1.7 7km SE of Bonita, CA
  14. 1.7 8km S of Palomar Observatory, CA
  15. 1.5 9km ENE 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.