Earthquake · reviewed by a seismologist
M 2.3md
6km S of Vallecito, CA
- When
- Magnitude
- M 2.3 (md)
- Depth
- 21 km below the surface
- Felt
- 3 reports · strongest reported intensity II
- Nearest
- Calaveras County, 19 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1640 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.
How big was it?
This earthquake released about 88 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
- Magna, Utah 2020 M 5.7 120,000× the energy of this one
- Around the size people start to feel M 3.0 11× the energy of this one
- This earthquake M 2.3 about 88 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 38.0297, -120.4703. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Calaveras County, CA | 19 km (12 mi) | SSE of here | earthquakes near Calaveras County |
| Tuolumne County, CA | 44 km (28 mi) | W of here | earthquakes near Tuolumne County |
| Amador County, CA | 49 km (30 mi) | SSE of here | earthquakes near Amador County |
| Stanislaus County, CA | 70 km (43 mi) | NE of here | earthquakes near Stanislaus County |
| Mariposa County, CA | 71 km (44 mi) | NW of here | earthquakes near Mariposa County |
| San Joaquin County, CA | 71 km (44 mi) | E 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
3 earthquakes have been recorded within 50 km since this one.
- 2.2 9 km NW of Chinese Camp, CA
- 2.1 20 km ENE of Mi-Wuk Village, CA
- 1.9 18km E of Groveland-Big Oak Flat, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.