QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

5 km E of Fairmead, California

· 20 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 37 kmMerced County 54 kmFresno County 56 kmMariposa County 58 kmStanislaus County 94 kmSan Benito County 100 kmTuolumne County 105 kmKings County 116 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 2.1 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Madera County, 37 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3365 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 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 37.0857, -120.1313. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 37 km (23 mi) WSW of here earthquakes near Madera County
Merced County, CA 54 km (33 mi) ESE of here earthquakes near Merced County
Fresno County, CA 56 km (35 mi) NW of here earthquakes near Fresno County
Mariposa County, CA 58 km (36 mi) SSW of here earthquakes near Mariposa County
Stanislaus County, CA 94 km (58 mi) SE of here earthquakes near Stanislaus County
San Benito County, CA 100 km (62 mi) ENE of here earthquakes near San Benito 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. 1.6 10km W of Ahwahnee, CA
  2. 1.8 3km SSW of Parkwood, CA
  3. 2.4 7km NNW of Biola, CA
  4. 2.5 6km N of Biola, CA
  5. 1.9 7km W of Yosemite Lakes, CA
  6. 1.6 18km SSW of Bootjack, CA
  7. 2.3 19km WNW of Yosemite Lakes, CA
  8. 1.8 3km W of Madera Acres, CA
  9. 2.3 6km W of Madera, CA
  10. 1.7 10km W of Ahwahnee, CA
  11. 1.6 2km NW of Oakhurst, CA
  12. 2.6 17km SSW of Bootjack, CA
  13. 2.1 9km N of Clovis, CA
  14. 1.8 17km SSW of Bootjack, CA
  15. 2.1 16km SSW of Bootjack, 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.