Earthquake · reviewed by a seismologist
M 1.9md
9km NNE of Napa, CA
- When
- Magnitude
- M 1.9 (md)
- Depth
- 3.0 km below the surface
- Felt
- 2 reports · strongest reported intensity III
- Nearest
- Napa County, 17 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2465 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.
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 5.8 790,000× the energy of this one
- Magna, Utah 2020 M 5.7 560,000× the energy of this one
- Around the size people start to feel M 3.0 50× 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 38.3692, -122.2328. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Napa County, CA | 17 km (11 mi) | SSE of here | earthquakes near Napa County |
| Solano County, CA | 28 km (17 mi) | WNW of here | earthquakes near Solano County |
| Yolo County, CA | 45 km (28 mi) | SW of here | earthquakes near Yolo County |
| Contra Costa County, CA | 56 km (35 mi) | NNW of here | earthquakes near Contra Costa County |
| Marin County, CA | 57 km (35 mi) | NE of here | earthquakes near Marin County |
| Sonoma County, CA | 63 km (39 mi) | ESE of here | earthquakes near Sonoma County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
23 earthquakes have been recorded within 50 km since this one.
- 1.5 6km ENE of Vallejo, CA
- 1.8 14km E of Angwin, CA
- 1.6 15km E of Angwin, CA
- 2.1 10km ESE of Hidden Valley Lake, CA
- 2.1 6km WSW of Glen Ellen, CA
- 1.5 5km E of Vallejo, CA
- 1.6 14km ESE of Hidden Valley Lake, CA
- 2.5 12km ESE of Angwin, CA
- 1.9 4km SSE of Elmira, CA
- 1.8 5km NNW of Green Valley, CA
- 1.6 5km NE of Kenwood, CA
- 2.3 16km SE of Hidden Valley Lake, CA
- 1.7 14km E of Angwin, CA
- 2.6 0km S of East Richmond Heights, CA
- 2.4 2km E of Pacheco, 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.