QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

4km NNW of Lake Henshaw, CA

· 12 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 28 kmRiverside County 88 kmOrange County 103 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 1.7 (ml)
Depth
12 km below the surface
Felt
no reports yet
Nearest
San Diego County, 28 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1588 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 33.2743, -116.7823. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 28 km (17 mi) N of here earthquakes near San Diego County
Riverside County, CA 88 km (55 mi) SW of here earthquakes near Riverside County
Orange County, CA 103 km (64 mi) ESE of here earthquakes near Orange County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.6 12km SSW of Idyllwild, CA
  2. 1.6 16km ESE of Anza, CA
  3. 1.8 8km NNE of Borrego Springs, CA
  4. 1.6 8km NNE of Borrego Springs, CA
  5. 1.6 8km NNE of Borrego Springs, CA
  6. 3.3 7km NNE of Borrego Springs, CA
  7. 1.8 10km SSE of Idyllwild, CA
  8. 1.9 10km SW of Idyllwild, CA
  9. 2.0 14km ESE of Anza, CA
  10. 2.2 13km WNW of Anza, CA
  11. 1.8 10km SSW of Idyllwild, CA
  12. 1.9 6km NW of Anza, CA
  13. 1.5 8km NW of Anza, CA
  14. 1.9 12km N of Borrego Springs, CA
  15. 1.9 21km ESE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.2 on 2016-06-10 — it released about 180,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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