QuakeIndex

quarry blast · reviewed by a seismologist

M 1.9md

7km NE of Bonadelle Ranchos-Madera Ranchos, CA

· -0.7 km deep · released about 23 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madera County 21 kmFresno County 32 kmMariposa County 62 kmMerced County 83 kmKings County 106 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 1.9 (md)
Depth
-0.7 km below the surface
Felt
no reports yet
Nearest
Madera County, 21 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1584 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 23 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 660,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 470,000× the energy of this one
  3. Around the size people start to feel M 3.0 42× the energy of this one
  4. This earthquake M 1.9 about 23 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 37.0243, -119.8092. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madera County, CA 21 km (13 mi) SSW of here earthquakes near Madera County
Fresno County, CA 32 km (20 mi) NNW of here earthquakes near Fresno County
Mariposa County, CA 62 km (38 mi) S of here earthquakes near Mariposa County
Merced County, CA 83 km (52 mi) ESE of here earthquakes near Merced County
Kings County, CA 106 km (66 mi) N of here earthquakes near Kings County
Tuolumne County, CA 112 km (69 mi) S of here earthquakes near Tuolumne County

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

Aftershocks so far

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

  1. 2.1 6km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  2. 2.4 21km S of Mariposa, CA
  3. 2.2 21km ENE of Le Grand, CA
  4. 1.9 7km NE of Bonadelle Ranchos-Madera Ranchos, CA
  5. 2.2 7km NE of Bonadelle Ranchos-Madera Ranchos, CA
  6. 1.5 3km WSW of Oakhurst, CA
  7. 2.3 13km NW of Squaw Valley, CA
  8. 2.3 16km SSW of Fairmead, CA
  9. 2.2 22km ENE of Le Grand, CA
  10. 2.1 5km ENE of Bonadelle Ranchos-Madera Ranchos, CA
  11. 2.2 14km SSW of Fairmead, CA
  12. 2.2 13km SSW of Mariposa, CA
  13. 1.8 12km NNE of North Fork, CA
  14. 2.1 6km NE of Bonadelle Ranchos-Madera Ranchos, CA
  15. 2.4 21km 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.