QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

4 km WNW of Tuttletown, California

· 3.9 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Calaveras County 21 kmTuolumne County 47 kmAmador County 50 kmStanislaus County 66 kmSan Joaquin County 68 kmMariposa County 71 kmEl Dorado County 87 kmSacramento County 88 kmMerced County 92 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 1.5 (ml)
Depth
3.9 km below the surface
Felt
no reports yet
Nearest
Calaveras County, 21 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2802 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 5.4 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 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 38.0060, -120.5065. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Calaveras County, CA 21 km (13 mi) SSE of here earthquakes near Calaveras County
Tuolumne County, CA 47 km (30 mi) W of here earthquakes near Tuolumne County
Amador County, CA 50 km (31 mi) SSE of here earthquakes near Amador County
Stanislaus County, CA 66 km (41 mi) NE of here earthquakes near Stanislaus County
San Joaquin County, CA 68 km (42 mi) E of here earthquakes near San Joaquin County
Mariposa County, CA 71 km (44 mi) NW of here earthquakes near Mariposa County

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

Aftershocks so far

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

  1. 2.2 9 km NW of Chinese Camp, CA
  2. 2.1 20 km ENE of Mi-Wuk Village, CA
  3. 1.9 18km E of Groveland-Big Oak Flat, CA
  4. 2.3 6km S of Vallecito, CA
  5. 2.1 11km E of Groveland-Big Oak Flat, CA
  6. 1.8 7km WNW of Chinese Camp, CA
  7. 1.5 16km ESE of Groveland-Big Oak Flat, CA
  8. 2.5 18km SE of Groveland-Big Oak Flat, CA
  9. 1.9 3km WNW of Chinese Camp, CA
  10. 2.3 14km S of Groveland-Big Oak Flat, CA
  11. 1.7 4 km SSE of Vallecito, California
  12. 1.5 Northern California
  13. 1.7 3 km ESE of Murphys, California

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.