QuakeIndex

quarry blast · reviewed by a seismologist

M 1.6md

12km NNW of Friant, CA

· -0.4 km deep · released about 6.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 15 kmFresno County 37 kmMariposa County 56 kmMerced County 84 kmTuolumne County 106 kmKings 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 1.6 (md)
Depth
-0.4 km below the surface
Felt
no reports yet
Nearest
Madera County, 15 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1224 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 6.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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 37.0787, -119.7812. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 15 km (9 mi) S of here earthquakes near Madera County
Fresno County, CA 37 km (23 mi) NNW of here earthquakes near Fresno County
Mariposa County, CA 56 km (35 mi) SSE of here earthquakes near Mariposa County
Merced County, CA 84 km (52 mi) E of here earthquakes near Merced County
Tuolumne County, CA 106 km (66 mi) S of here earthquakes near Tuolumne County
Kings County, CA 112 km (70 mi) N of here earthquakes near Kings County

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

Aftershocks so far

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

  1. 2.1 18 km S of Auberry, CA
  2. 1.8 9 km ESE of North Fork, CA
  3. 1.9 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  4. 2.3 6 km E of Bonadelle Ranchos-Madera Ranchos, CA
  5. 2.4 7 km SSW of Mariposa, CA
  6. 2.3 10 km SSW of Mariposa, CA
  7. 2.2 1 km ENE of Yosemite Lakes, CA
  8. 1.8 5 km E of Yosemite Lakes, CA
  9. 2.6 4 km ENE of Yosemite Lakes, CA
  10. 1.8 10 km NW of Auberry, CA
  11. 2.3 10 km SSW of Mariposa, CA
  12. 2.0 10 km SSW of Mariposa, CA
  13. 2.3 11 km SSW of Mariposa, CA
  14. 2.8 10 km SSW of Mariposa, CA
  15. 2.0 9 km SSW of Mariposa, 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.