Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Angwin, CA
No earthquake was likely felt in Angwin in the 24 hours to 2:48 am PST (10:48 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 14 km (9 mi) east-southeast of Angwin, CA, at 6:16 am PST on 4 November 2019 (14:16 UTC), 7.5 km deep.
USGS: 14km ESE of Angwin, CA
84 km (52 mi) N of San Francisco, CA · 26 km (16 mi) N of Napa, CA
- When
- 6:16 am PST on 4 November 2019 ()
- Where
- 14 km (9 mi) east-southeast of Angwin, CA · earthquakes near Angwin
- Magnitude
- M 1.6 (md)
- Depth
- 7.5 km below the surface
- Felt
- no reports yet
- Nearest
- Napa County, 4 km SW
- Nearest mapped fault
- Green Valley fault, 4 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 2560 days ago
Earthquake alerts for Angwin, CA
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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 8 km (5 mi) from the epicentre. In Angwin, 14 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, Saint Helena, Yountville, Calistoga, Kenwood, Napa.
How big was it?
This earthquake released about 7.3 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 7.3 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 4.2 on 2018-01-18 — about 8,800 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 6.0 The 2014 South Napa, California Earthquake · 35 km S of this epicentre
- 5.4 South of Elmira, California · 43 km SE 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 38.5328, -122.2977. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Napa County, CA | 4 km (2 mi) | SW | earthquakes near Napa County |
| Yolo County, CA | 38 km (24 mi) | ENE | earthquakes near Yolo County |
| Solano County, CA | 43 km (27 mi) | SE | earthquakes near Solano County |
| Sonoma County, CA | 55 km (34 mi) | W | earthquakes near Sonoma County |
| Marin County, CA | 66 km (41 mi) | SW | earthquakes near Marin County |
| Colusa County, CA | 72 km (45 mi) | N | earthquakes near Colusa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
22 earthquakes have been recorded within 50 km since this one.
- 1.9 9km NNE of Napa, CA
- 2.5 7km WNW of Yountville, CA
- 1.5 4km SSW of Anderson Springs, CA
- 1.9 3km SW of Anderson Springs, CA
- 2.5 2km WSW of Anderson Springs, CA
- 1.5 3km W of Anderson Springs, CA
- 2.0 3km W of Anderson Springs, CA
- 1.5 1km E of The Geysers, CA
- 1.8 2km N of The Geysers, CA
- 1.7 3km SSW of American Canyon, CA
- 1.6 2km SW of Cobb, CA
- 1.7 1km NNW of The Geysers, CA
- 2.2 4km SSE of The Geysers, CA
- 1.9 2km E of The Geysers, CA
- 1.5 9km E of Hidden Valley Lake, 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.