Earthquake · reviewed by a seismologist
M 2.6md
Earthquake near Hidden Valley Lake, CA
No earthquake was likely felt in Hidden Valley Lake in the 24 hours to 3:45 pm PST (23:45 UTC). The last one was M 2.6, 18 km (11 mi) W, at 4:44 pm PST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Hidden Valley Lake
This page: a magnitude 2.6 earthquake was recorded 10 km (7 mi) east-southeast of Hidden Valley Lake, CA, at 3:59 pm PDT on 6 August 2019 (22:59 UTC), 9.8 km deep. 8 people have reported feeling it to USGS.
USGS: 10km ESE of Hidden Valley Lake, CA
42 km (26 mi) NNE of Santa Rosa, CA · 110 km (68 mi) N of San Francisco, CA
- When
- 3:59 pm PDT on 6 August 2019 ()
- Where
- 10 km (7 mi) east-southeast of Hidden Valley Lake, CA · earthquakes near Hidden Valley Lake
- Magnitude
- M 2.6 (md)
- Depth
- 9.8 km below the surface
- Felt
- 8 reports · strongest reported intensity III
- Nearest
- Napa County, 31 km SSE
- Nearest mapped fault
- Hunting Creek-Berryessa fault system, 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 2653 days ago
Earthquake alerts for Hidden Valley Lake, CA
Get a notification in this browser when USGS records an earthquake near Hidden Valley Lake, 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 22 km (14 mi) from the epicentre. In Hidden Valley Lake, 10 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.
Likely felt in: Angwin 22 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 270 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 57,000× the energy of this one
- Magna, Utah 2020 M 5.7 40,000× the energy of this one
- Around the size people start to feel M 3.0 3.6× the energy of this one
- This earthquake M 2.6 about 270 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 3,700 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 38.7695, -122.4482. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Napa County, CA | 31 km (19 mi) | SSE | earthquakes near Napa County |
| Lake County, CA | 46 km (28 mi) | NW | earthquakes near Lake County |
| Yolo County, CA | 48 km (30 mi) | ESE | earthquakes near Yolo County |
| Colusa County, CA | 49 km (30 mi) | NNE | earthquakes near Colusa County |
| Sonoma County, CA | 50 km (31 mi) | WSW | earthquakes near Sonoma County |
| Sutter County, CA | 71 km (44 mi) | ENE | earthquakes near Sutter 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.
- 1.6 13km E of Angwin, CA
- 1.7 14km E of Angwin, CA
- 1.6 4km ESE of Kenwood, CA
- 1.6 7km NW of The Geysers, CA
- 1.7 3km NW of The Geysers, CA
- 1.9 6km NW of The Geysers, CA
- 1.6 12km ESE of Hidden Valley Lake, CA
- 1.6 6km WNW of The Geysers, CA
- 1.5 6km WNW of The Geysers, CA
- 2.0 1km N of The Geysers, CA
- 1.9 3km NW of The Geysers, CA
- 1.6 8km W of Cobb, CA
- 1.5 7km NW of The Geysers, CA
- 1.7 10km NW of The Geysers, CA
- 1.8 5km WNW 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.