QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

19km S of Mariposa, CA

· 22 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 25 kmMariposa County 30 kmMerced County 65 kmFresno County 69 kmTuolumne County 78 kmStanislaus County 93 kmCalaveras County 109 kmMono County 119 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
22 km below the surface
Felt
no reports yet
Nearest
Madera County, 25 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2382 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 14 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 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 37.3162, -120.0005. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 25 km (16 mi) WNW of here earthquakes near Madera County
Mariposa County, CA 30 km (18 mi) SSW of here earthquakes near Mariposa County
Merced County, CA 65 km (41 mi) ENE of here earthquakes near Merced County
Fresno County, CA 69 km (43 mi) NNW of here earthquakes near Fresno County
Tuolumne County, CA 78 km (49 mi) S of here earthquakes near Tuolumne County
Stanislaus County, CA 93 km (58 mi) ESE of here earthquakes near Stanislaus County

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

Aftershocks so far

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

  1. 2.1 21km SSW of Mariposa, CA
  2. 2.2 5km SW of North Fork, CA
  3. 2.1 18km SSW of Mariposa, CA
  4. 1.9 1km SW of Mariposa, CA
  5. 1.9 7km NE of Bonadelle Ranchos-Madera Ranchos, CA
  6. 1.6 7km NE of Bonadelle Ranchos-Madera Ranchos, CA
  7. 1.8 6km NNW of Ahwahnee, CA
  8. 2.0 6km SW of North Fork, CA
  9. 2.2 21km SSW of Mariposa, CA
  10. 2.0 6km NE of Oakhurst, CA
  11. 2.4 20km WNW of Yosemite Lakes, CA
  12. 1.6 14km SW of Bootjack, CA
  13. 2.1 12km WNW of Midpines, CA
  14. 2.1 14km NW of Midpines, CA
  15. 1.7 9km NNW 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.