QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

3km W of Madera Acres, CA

· 17 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 38 kmFresno County 49 kmMerced County 59 kmMariposa County 64 kmSan Benito County 99 kmStanislaus County 100 kmKings County 108 kmTuolumne County 112 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 1.8 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Madera County, 38 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2565 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 37.0162, -120.0978. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 38 km (23 mi) SW of here earthquakes near Madera County
Fresno County, CA 49 km (30 mi) NW of here earthquakes near Fresno County
Merced County, CA 59 km (37 mi) ESE of here earthquakes near Merced County
Mariposa County, CA 64 km (40 mi) SSW of here earthquakes near Mariposa County
San Benito County, CA 99 km (61 mi) ENE of here earthquakes near San Benito County
Stanislaus County, CA 100 km (62 mi) SE of here earthquakes near Stanislaus County

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

Aftershocks so far

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

  1. 1.6 9km SSE of Yosemite Lakes, CA
  2. 2.0 9km SW of Yosemite Lakes, CA
  3. 1.8 12km W of Auberry, CA
  4. 1.6 13km S of Mariposa, CA
  5. 2.2 6km WNW of Yosemite Lakes, CA
  6. 2.6 5km ENE of West Park, CA
  7. 1.6 19km SSW of Bootjack, CA
  8. 2.3 16km SSW of Bootjack, CA
  9. 2.5 19km SSW of Mariposa, CA
  10. 1.8 2km NNW of Coarsegold, CA
  11. 2.1 10km NE of Fairmead, CA
  12. 2.0 15km SSW of Bootjack, CA
  13. 2.3 20km SSW of Bootjack, CA
  14. 2.0 11km S of Yosemite Lakes, CA
  15. 2.0 6km W of Yosemite Lakes, 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.