Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near Clearlake, CA
No earthquake was likely felt in Clearlake in the 24 hours to 7:56 am PST (15:56 UTC). The last one was M 2.6, 22 km (14 mi) SSW, at 4:44 pm PST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Clearlake
This page: a magnitude 1.7 earthquake was recorded 12 km (7 mi) east-northeast of Clearlake, CA, at 11:03 am PST on 7 November 2018 (19:03 UTC), 12 km deep. 1 person has reported feeling it to USGS.
USGS: 12km ENE of Clearlake, CA
- When
- 11:03 am PST on 7 November 2018 ()
- Where
- 12 km (7 mi) east-northeast of Clearlake, CA · earthquakes near Clearlake
- Magnitude
- M 1.7 (md)
- Depth
- 12 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Lake County, 23 km WNW
- Nearest mapped fault
- Bartlett Springs fault system, 2 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 2926 days ago
Earthquake alerts for Clearlake, CA
Get a notification in this browser when USGS records an earthquake near Clearlake, 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 3 km (2 mi) from the epicentre. In Clearlake, 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: Lower Lake, Clearlake Oaks, Clear Lake Riviera, Hidden Valley Lake, Soda Bay, Cobb.
How big was it?
This earthquake released about 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 100× the energy of this one
- This earthquake M 1.7 about 9.3 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 5.1 on 2016-08-10 — 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 39.0073, -122.5063. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake County, CA | 23 km (15 mi) | WNW | earthquakes near Lake County |
| Colusa County, CA | 30 km (19 mi) | NE | earthquakes near Colusa County |
| Napa County, CA | 58 km (36 mi) | SSE | earthquakes near Napa County |
| Yolo County, CA | 64 km (40 mi) | SE | earthquakes near Yolo County |
| Sonoma County, CA | 65 km (40 mi) | SW | earthquakes near Sonoma County |
| Glenn County, CA | 67 km (42 mi) | N | earthquakes near Glenn County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 1.6 3km WSW of Anderson Springs, CA
- 2.0 3km NNW of The Geysers, CA
- 1.9 3km NNW of The Geysers, CA
- 2.8 2km ESE of The Geysers, CA
- 1.7 1km NNE of The Geysers, CA
- 1.6 2km N of The Geysers, CA
- 1.9 6km NW of The Geysers, CA
- 2.4 5km WNW of Cobb, CA
- 1.9 4km W of Cobb, CA
- 2.2 1km NNW of The Geysers, CA
- 1.7 7km NW of The Geysers, CA
- 1.7 6km WNW of Cobb, CA
- 1.9 4km NW of The Geysers, CA
- 1.6 3km SW of Cobb, CA
- 1.7 3km 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.