QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

5km E of Calimesa, CA

· 15 km deep · released about 320 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 80 kmRiverside County 97 kmSan Diego County 110 kmLos Angeles County 118 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 2.7 (ml)
Depth
15 km below the surface
Felt
4 reports · strongest reported intensity III
Nearest
Orange County, 80 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3235 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 320 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 48,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 34,000× the energy of this one
  3. Around the size people start to feel M 3.0 3× the energy of this one
  4. This earthquake M 2.7 about 320 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 33.9910, -117.0005. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 80 km (50 mi) ENE of here earthquakes near Orange County
Riverside County, CA 97 km (60 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 110 km (68 mi) N of here earthquakes near San Diego County
Los Angeles County, CA 118 km (74 mi) E of here earthquakes near Los Angeles County
San Bernardino County, CA 122 km (76 mi) SW of here earthquakes near San Bernardino County

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

Aftershocks so far

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

  1. 1.5 3km ENE of Rialto, CA
  2. 1.8 5km SSW of Idyllwild, CA
  3. 1.7 11km SSW of Idyllwild, CA
  4. 1.5 6km N of Big Bear City, CA
  5. 3.2 6km N of Big Bear City, CA
  6. 1.6 4km WNW of Muscoy, CA
  7. 1.7 4km S of Redlands, CA
  8. 1.6 2km W of Devore, CA
  9. 1.6 9km SE of Valle Vista, CA
  10. 2.4 3km SW of San Bernardino, CA
  11. 2.5 6km SW of Idyllwild, CA
  12. 2.2 3km NNW of Glen Avon, CA
  13. 2.0 7km SSE of Redlands, CA
  14. 2.4 6km N of Big Bear City, CA
  15. 2.1 14km NNE of Cabazon, 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 4.4 on 2016-01-06 — it released about 370 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.