QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

12km NE of Coso Junction, CA

Yes. A magnitude 3.1 earthquake was recorded 12km NE of Coso Junction, CA, at 1:15 am PDT on 25 August 2019 (08:15 UTC), 1.7 km deep. 4 people have reported feeling it to USGS.

· 1.7 km deep · released about 1,500 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Inyo County 63 kmTulare County 85 kmKern County 117 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 3.1 (ml)
Depth
1.7 km below the surface
Felt
4 reports · strongest reported intensity III
Nearest
Inyo County, 63 km NE
Nearest mapped fault
Southern Sierra Nevada fault, 14 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 752 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 43 km (27 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,200× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× more

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.

For this area

The largest earthquake within 50 km since 2016 was M 7.1 on 2019-07-06 — about 900,000 times the energy of this one.

Before 2016, the USGS record lists 17 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.3 The 1946 Walker Pass, California Earthquake · 47 km S of this epicentre
  2. 5.8 16km NNE of Ridgecrest, California · 44 km SSE of this epicentre
  3. 5.4 14km NW of Inyokern, CA · 45 km S of this epicentre
  4. 5.4 4km N of Inyokern, CA · 49 km S of this epicentre
  5. 5.4 17km N of Ridgecrest, California · 42 km SSE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 36.1188, -117.8470. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Inyo County, CA 63 km (39 mi) NE earthquakes near Inyo County
Tulare County, CA 85 km (53 mi) W earthquakes near Tulare County
Kern County, CA 117 km (73 mi) SW earthquakes near Kern County

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

Aftershocks so far

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

  1. 2.5 8km NE of Coso Junction, CA
  2. 1.9 15km ESE of Olancha, CA
  3. 1.6 19km W of Searles Valley, CA
  4. 1.6 11km NE of Coso Junction, CA
  5. 1.7 21km ESE of Little Lake, CA
  6. 1.5 19km ESE of Little Lake, CA
  7. 2.4 21km ESE of Little Lake, CA
  8. 2.0 10km ENE of Coso Junction, CA
  9. 1.6 10km ENE of Coso Junction, CA
  10. 2.1 24km N of Ridgecrest, CA
  11. 2.4 13km NE of Coso Junction, CA
  12. 2.5 11km NE of Coso Junction, CA
  13. 1.9 7km NE of Coso Junction, CA
  14. 2.0 15km NW of Coso Junction, CA
  15. 1.7 16km W of Searles Valley, 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.