Earthquake · automatic estimate, may change
M 1.5md
Earthquake near Cobb, CA
No earthquake was likely felt in Cobb in the 24 hours to 8:47 am PST (16:47 UTC). The last one was M 1.6, 5 km (3 mi) S, at 5:12 am PST on 10 November 2026, estimated intensity II (weak) in town. Every earthquake near Cobb
This page: a magnitude 1.5 earthquake was recorded 12 km (7 mi) west-northwest of Cobb, CA, at 9:29 am PDT on 9 August 2026 (16:29 UTC), 4.8 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 12 km WNW of Cobb, CA
48 km (30 mi) NNW of Santa Rosa, CA · 127 km (79 mi) NNW of San Francisco, CA
- When
- 9:29 am PDT on 9 August 2026 ()
- Where
- 12 km (7 mi) west-northwest of Cobb, CA · earthquakes near Cobb
- Magnitude
- M 1.5 (md)
- Depth
- 4.8 km below the surface
- Felt
- no reports yet
- Nearest
- Lake County, 28 km NNE
- Nearest mapped fault
- Konocti Bay fault, 10 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 94 days ago
Earthquake alerts for Cobb, 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 9 km (6 mi) from the epicentre. In Cobb, 12 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: Kelseyville, Clear Lake Riviera, Soda Bay, Cloverdale, Lakeport, Lower Lake.
How big was it?
This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 180,000 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 NW 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 38.8683, -122.8440. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake County, CA | 28 km (17 mi) | NNE | earthquakes near Lake County |
| Sonoma County, CA | 39 km (24 mi) | S | earthquakes near Sonoma County |
| Napa County, CA | 60 km (37 mi) | SE | earthquakes near Napa County |
| Colusa County, CA | 63 km (39 mi) | ENE | earthquakes near Colusa County |
| Mendocino County, CA | 81 km (50 mi) | NW | earthquakes near Mendocino County |
| Yolo County, CA | 84 km (52 mi) | ESE | earthquakes near Yolo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 2.2 2 km NE of The Geysers, CA
- 1.8 1 km NE of The Geysers, CA
- 1.5 3 km SW of Anderson Springs, CA
- 2.0 10 km E of Cloverdale, CA
- 1.9 3 km SW of Anderson Springs, CA
- 1.9 6 km NNW of The Geysers, CA
- 1.7 6 km W of Cobb, CA
- 1.9 7 km NW of The Geysers, CA
- 1.9 6 km NW of The Geysers, CA
- 1.8 6 km W of Cobb, CA
- 2.4 9 km WNW of The Geysers, CA
- 1.7 5 km NNW of The Geysers, CA
- 1.5 6 km WNW of Cobb, CA
- 1.5 18 km SE of Lake Pillsbury, CA
- 1.6 3 km SE 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.