QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

7km SE of San Pedro, CA

· 7.8 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 42 kmLos Angeles County 55 kmVentura County 111 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
7.8 km below the surface
Felt
no reports yet
Nearest
Orange County, 42 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1774 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 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× 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 33.6990, -118.2270. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 42 km (26 mi) W of here earthquakes near Orange County
Los Angeles County, CA 55 km (34 mi) S of here earthquakes near Los Angeles County
Ventura County, CA 111 km (69 mi) SE of here earthquakes near Ventura County

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

Aftershocks so far

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

  1. 2.1 0km WSW of View Park-Windsor Hills, CA
  2. 1.8 2km NW of Torrance, CA
  3. 1.9 3km NE of Yorba Linda, CA
  4. 1.7 4km SE of Las Flores, CA
  5. 2.3 3km ENE of Marina del Rey, CA
  6. 2.1 10km SE of San Pedro, CA
  7. 1.8 23km ENE of Avalon, CA
  8. 2.0 17km SSE of San Pedro, CA
  9. 1.7 10km SW of Laguna Beach, CA
  10. 2.0 21km S of San Pedro, CA
  11. 1.8 5km SSE of San Pedro, CA
  12. 1.6 5km SSE of San Pedro, CA
  13. 2.1 3km NE of Gardena, CA
  14. 2.6 2km WSW of Silver Lake, CA
  15. 1.5 0km SSW of View Park-Windsor Hills, 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 4.5 on 2020-09-19 — it released about 19,000 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.