QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

2km NW of North Fork, CA

· 42 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 20 kmMariposa County 50 kmFresno County 55 kmTuolumne County 94 kmMono County 94 kmMerced County 106 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
42 km below the surface
Felt
no reports yet
Nearest
Madera County, 20 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2282 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 44 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 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 37.2460, -119.5330. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 20 km (12 mi) ENE of here earthquakes near Madera County
Mariposa County, CA 50 km (31 mi) SE of here earthquakes near Mariposa County
Fresno County, CA 55 km (34 mi) NNE of here earthquakes near Fresno County
Tuolumne County, CA 94 km (59 mi) SSE of here earthquakes near Tuolumne County
Mono County, CA 94 km (59 mi) SW of here earthquakes near Mono County
Merced County, CA 106 km (66 mi) E of here earthquakes near Merced County

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

Aftershocks so far

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

  1. 2.3 16km SSW of Bootjack, CA
  2. 1.6 20km SE of Yosemite Valley, CA
  3. 2.7 19km SE of Yosemite Valley, CA
  4. 2.6 20km SE of Yosemite Valley, CA
  5. 2.8 19km SE of Yosemite Valley, CA
  6. 1.6 20km SE of Yosemite Valley, CA
  7. 2.3 20km ESE of Yosemite Valley, CA
  8. 1.9 18km SE of Yosemite Valley, CA
  9. 2.6 20km SE of Yosemite Valley, CA
  10. 2.5 19km SE of Yosemite Valley, CA
  11. 1.9 20km SE of Yosemite Valley, CA
  12. 1.5 20km ESE of Yosemite Valley, CA
  13. 1.6 20km ESE of Yosemite Valley, CA
  14. 3.4 20km SE of Yosemite Valley, CA
  15. 2.4 20km SE of Yosemite 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.