QuakeIndex

quarry blast · reviewed by a seismologist

M 1.9ml

6km NNW of Lakeside, CA

· -0.2 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 20 kmOrange County 115 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 1.9 (ml)
Depth
-0.2 km below the surface
Felt
no reports yet
Nearest
San Diego County, 20 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2640 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 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× the energy of this one
  4. This earthquake M 1.9 about 19 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 32.9102, -116.9472. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 20 km (13 mi) SW of here earthquakes near San Diego County
Orange County, CA 115 km (71 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

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

  1. 1.8 3km SE of Lake Henshaw, CA
  2. 1.6 16km WSW of Tecate, B.C., MX
  3. 2.1 2 km SE of Lake Henshaw, CA
  4. 1.9 6km NNW of Lakeside, CA
  5. 1.7 3km NE of San Ysidro, CA
  6. 1.7 3km SE of Lake Henshaw, CA
  7. 2.3 2km SE of Lake Henshaw, CA
  8. 1.7 3km ESE of Lake Henshaw, CA
  9. 3.6 2km SE of Lake Henshaw, CA
  10. 1.5 9km E of Julian, CA
  11. 1.6 3km SSE of Lake Henshaw, CA
  12. 2.2 16km SW of La Jolla, CA
  13. 1.6 11km NE of Julian, CA
  14. 1.8 6km SE of Chula Vista, CA
  15. 1.5 3km ENE of Rancho San Diego, 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.