Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Angwin, CA
No earthquake was likely felt in Angwin in the 24 hours to 3:14 am PST (11:14 UTC). The last one was M 1.6, in Angwin, at 11:57 pm PDT on 10 October 2026, estimated intensity II (weak) in town. Every earthquake near Angwin
This page: a magnitude 1.6 earthquake was recorded 11 km (7 mi) north-northeast of Angwin, CA, at 5:47 pm PDT on 6 July 2024 (00:47 UTC), 8.1 km deep.
USGS: 11 km NNE of Angwin, CA
99 km (61 mi) N of San Francisco, CA · 36 km (22 mi) NE of Santa Rosa, CA
- When
- 5:47 pm PDT on 6 July 2024 ()
- Where
- 11 km (7 mi) north-northeast of Angwin, CA · earthquakes near Angwin
- Magnitude
- M 1.6 (md)
- Depth
- 8.1 km below the surface
- Felt
- no reports yet
- Nearest
- Napa County, 19 km SSE
- Nearest mapped fault
- Hunting Creek-Berryessa fault system, 3 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 854 days ago
Earthquake alerts for Angwin, CA
Get a notification in this browser when USGS records an earthquake near Angwin, CA. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 7 km (4 mi) from the epicentre. In Angwin, 11 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Deer Park, Calistoga, Saint Helena, Middletown, Hidden Valley Lake, Yountville.
How big was it?
This earthquake released about 7.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
- Around the size people start to feel M 3.0 130× the energy of this one
- This earthquake M 1.6 about 7.1 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 5.0 on 2016-12-14 — about 140,000 times the energy of this one.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
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 38.6655, -122.4072. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Napa County, CA | 19 km (12 mi) | SSE | earthquakes near Napa County |
| Yolo County, CA | 44 km (27 mi) | E | earthquakes near Yolo County |
| Sonoma County, CA | 48 km (30 mi) | WSW | earthquakes near Sonoma County |
| Lake County, CA | 57 km (36 mi) | NNW | earthquakes near Lake County |
| Colusa County, CA | 59 km (37 mi) | NNE | earthquakes near Colusa County |
| Solano County, CA | 60 km (37 mi) | SE | earthquakes near Solano County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.7 3 km ENE of The Geysers, CA
- 1.5 2 km NW of The Geysers, CA
- 2.1 6 km NNW of The Geysers, CA
- 2.0 5 km NNW of The Geysers, CA
- 1.8 3 km NW of The Geysers, CA
- 1.9 16 km SE of Hidden Valley Lake, CA
- 1.6 3 km ENE of The Geysers, CA
- 1.6 8 km S of Calistoga, CA
- 1.6 12 km NW of The Geysers, CA
- 2.0 7 km WNW of Cobb, CA
- 1.5 10 km NW of The Geysers, CA
- 2.0 1 km NE of The Geysers, CA
- 1.9 7 km NNW of The Geysers, CA
- 1.5 4 km WNW of Cobb, CA
- 2.0 2 km ENE of The Geysers, 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.