QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

3 km ESE of Murphys, California

· 6.4 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Calaveras County 13 kmAmador County 40 kmTuolumne County 42 kmEl Dorado County 74 kmMariposa County 77 kmSan Joaquin County 77 kmAlpine County 77 kmStanislaus County 81 kmSacramento County 88 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 1.7 (ml)
Depth
6.4 km below the surface
Felt
no reports yet
Nearest
Calaveras County, 13 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2791 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 38.1294, -120.4270. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Calaveras County, CA 13 km (8 mi) ESE of here earthquakes near Calaveras County
Amador County, CA 40 km (25 mi) SSE of here earthquakes near Amador County
Tuolumne County, CA 42 km (26 mi) WNW of here earthquakes near Tuolumne County
El Dorado County, CA 74 km (46 mi) S of here earthquakes near El Dorado County
Mariposa County, CA 77 km (48 mi) NW of here earthquakes near Mariposa County
San Joaquin County, CA 77 km (48 mi) ENE of here earthquakes near San Joaquin County

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

Aftershocks so far

9 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. 2.3 6km S of Vallecito, CA
  4. 2.1 11km E of Groveland-Big Oak Flat, CA
  5. 1.8 7km WNW of Chinese Camp, CA
  6. 1.9 3km WNW of Chinese Camp, CA
  7. 2.3 14km S of Groveland-Big Oak Flat, CA
  8. 1.7 4 km SSE of Vallecito, California
  9. 1.5 Northern 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.