QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

17km SSW of Bootjack, CA

· 16 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 25 kmMariposa County 27 kmMerced County 67 kmFresno County 70 kmTuolumne County 76 kmStanislaus County 93 kmCalaveras County 108 kmMono County 117 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
16 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 2580 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× 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 37.3347, -119.9860. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 25 km (16 mi) WNW of here earthquakes near Madera County
Mariposa County, CA 27 km (17 mi) SSW of here earthquakes near Mariposa County
Merced County, CA 67 km (42 mi) ENE of here earthquakes near Merced County
Fresno County, CA 70 km (44 mi) NNW of here earthquakes near Fresno County
Tuolumne County, CA 76 km (47 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

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

  1. 2.4 3km ENE of Bootjack, CA
  2. 1.9 18km SSW of Yosemite Village, CA
  3. 2.3 20km SSW of Bootjack, CA
  4. 2.0 11km S of Yosemite Lakes, CA
  5. 2.0 6km W of Yosemite Lakes, CA
  6. 1.9 9km NNW of Ahwahnee, CA
  7. 2.1 2km NW of North Fork, CA
  8. 1.9 9km WSW of Mariposa, CA
  9. 1.8 18km SSW of Bootjack, CA
  10. 1.8 12km NNE of North Fork, CA
  11. 1.9 4km NW of Yosemite Lakes, CA
  12. 2.1 7km SSW of Yosemite Lakes, CA
  13. 1.8 20km SSW of Bootjack, CA
  14. 1.9 7km N of North Fork, CA
  15. 1.9 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.