QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4km E of Madera Acres, CA

· 24 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 33 kmFresno County 44 kmMariposa County 63 kmMerced County 65 kmSan Benito County 104 kmStanislaus County 106 kmKings County 107 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
24 km below the surface
Felt
no reports yet
Nearest
Madera County, 33 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2668 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 16 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 37.0150, -120.0278. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 33 km (20 mi) SW of here earthquakes near Madera County
Fresno County, CA 44 km (27 mi) NW of here earthquakes near Fresno County
Mariposa County, CA 63 km (39 mi) S of here earthquakes near Mariposa County
Merced County, CA 65 km (40 mi) ESE of here earthquakes near Merced County
San Benito County, CA 104 km (65 mi) ENE of here earthquakes near San Benito County
Stanislaus County, CA 106 km (66 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. 1.9 6km W of Yosemite Lakes, CA
  2. 1.6 3km NNW of Yosemite Lakes, CA
  3. 1.9 20km SSW of Bootjack, CA
  4. 2.1 18km SSW of Mariposa, CA
  5. 1.9 19km SSW of Mariposa, CA
  6. 2.7 18km SSW of Mariposa, CA
  7. 1.8 19km S of Mariposa, CA
  8. 1.6 19km SSW of Mariposa, CA
  9. 2.1 9km W of Yosemite Lakes, CA
  10. 2.2 19km SSW of Mariposa, CA
  11. 1.5 2km S of Oakhurst, CA
  12. 2.0 18km SSW of Bootjack, CA
  13. 1.6 21km SSW of Bootjack, CA
  14. 1.8 5km WSW of Oakhurst, CA
  15. 2.0 5km ESE 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.