QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

7km NNE of Lake Arrowhead, CA

· -0.6 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 90 kmLos Angeles County 102 kmSan Bernardino County 108 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
-0.6 km below the surface
Felt
no reports yet
Nearest
Orange County, 90 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3258 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 12 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 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 900,000× the energy of this one
  3. Around the size people start to feel M 3.0 80× the energy of this one
  4. This earthquake M 1.7 about 12 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 34.3022, -117.1567. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 90 km (56 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 102 km (64 mi) E of here earthquakes near Los Angeles County
San Bernardino County, CA 108 km (67 mi) SW of here earthquakes near San Bernardino County
Riverside County, CA 124 km (77 mi) WNW of here earthquakes near Riverside County

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

Aftershocks so far

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

  1. 1.5 6km NE of Lake Arrowhead, CA
  2. 1.5 6km NE of Lake Arrowhead, CA
  3. 2.1 6km ENE of Lake Arrowhead, CA
  4. 1.7 11km N of Cabazon, CA
  5. 1.6 9km ENE of Adelanto, CA
  6. 1.6 2km ESE of Loma Linda, CA
  7. 2.3 11km SE of Running Springs, CA
  8. 1.8 5km S of Lytle Creek, CA
  9. 1.7 5km WNW of Devore, CA
  10. 2.1 1km NW of Loma Linda, CA
  11. 1.6 5km ENE of Calimesa, CA
  12. 3.0 2km ESE of Loma Linda, CA
  13. 1.6 2km ESE of Loma Linda, CA
  14. 1.6 8km WSW of Calimesa, CA
  15. 1.7 3km N of Beaumont, 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 9,800 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.