Earthquake · reviewed by a seismologist
M 1.9md
3km WNW of Chinese Camp, CA
- When
- Magnitude
- M 1.9 (md)
- Depth
- 1.8 km below the surface
- Felt
- no reports yet
- Nearest
- Calaveras County, 35 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2516 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 19 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.
- Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
- Magna, Utah 2020 M 5.7 580,000× the energy of this one
- Around the size people start to feel M 3.0 51× the energy of this one
- This earthquake M 1.9 about 19 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 37.8850, -120.4663. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Calaveras County, CA | 35 km (22 mi) | SSE of here | earthquakes near Calaveras County |
| Tuolumne County, CA | 47 km (29 mi) | WSW of here | earthquakes near Tuolumne County |
| Stanislaus County, CA | 59 km (37 mi) | NE of here | earthquakes near Stanislaus County |
| Mariposa County, CA | 60 km (37 mi) | NW of here | earthquakes near Mariposa County |
| Amador County, CA | 64 km (40 mi) | SSE of here | earthquakes near Amador 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
8 earthquakes have been recorded within 50 km since this one.
- 2.2 9 km NW of Chinese Camp, CA
- 1.9 18km E of Groveland-Big Oak Flat, CA
- 2.3 6km S of Vallecito, CA
- 2.1 11km E of Groveland-Big Oak Flat, CA
- 2.1 14km NW of Midpines, CA
- 1.8 7km WNW of Chinese Camp, CA
- 1.5 16km ESE of Groveland-Big Oak Flat, CA
- 2.5 18km SE 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.