Earthquake · automatic estimate, may change
M 2.2md
Earthquake near Boonville, CA
USGS: 10 km W of Boonville, CA
92 km (57 mi) NW of Santa Rosa, CA
- When
- 5:51 am PDT on 30 September 2026 ()
- Where
- 10 km (6 mi) W of Boonville, CA · earthquakes near Boonville
- Magnitude
- M 2.2 (md)
- Depth
- 2.6 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Mendocino County, 47 km N
- Nearest mapped fault
- San Andreas fault, 16 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 3 days ago
A magnitude 2.2 earthquake was recorded 10 km (6 mi) W of Boonville, CA, at 5:51 am PDT on 30 September 2026 (12:51 UTC). 1 person has reported feeling it to USGS. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Ukiah.
How big was it?
This earthquake released about 52 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 290,000× the energy of this one
- Magna, Utah 2020 M 5.7 200,000× the energy of this one
- Around the size people start to feel M 3.0 18× the energy of this one
- This earthquake M 2.2 about 52 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.
For this area
The largest earthquake within 50 km since 2016 was M 5.6 on 2026-06-24 — about 140,000 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.2 6 km ESE of Talmage, California · 35 km ENE of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 39.0133, -123.4838. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mendocino County, CA | 47 km (29 mi) | N | earthquakes near Mendocino County |
| Lake County, CA | 65 km (40 mi) | E | earthquakes near Lake County |
| Sonoma County, CA | 73 km (45 mi) | SE | earthquakes near Sonoma County |
| Colusa County, CA | 109 km (68 mi) | E | earthquakes near Colusa County |
| Glenn County, CA | 114 km (71 mi) | NE | earthquakes near Glenn County |
| Napa County, CA | 115 km (72 mi) | ESE | earthquakes near Napa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
2 earthquakes have been recorded within 50 km since this one.
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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| reported intensity | not reported | 2.2 | |
| felt reports | not reported | 1 |
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.