Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Clearlake Oaks, CA
No earthquake was likely felt in Clearlake Oaks in the 24 hours to 2:47 am PST (10:47 UTC). The last one was M 2.8, 19 km (12 mi) SE, at 1:02 pm PST on 2 November 2026, estimated intensity II (weak) in town. Every earthquake near Clearlake Oaks
This page: a magnitude 1.5 earthquake was recorded 9 km (5 mi) east of Clearlake Oaks, CA, at 6:49 pm PDT on 27 March 2020 (01:49 UTC), 4.8 km deep.
USGS: 9km E of Clearlake Oaks, CA
- When
- 6:49 pm PDT on 27 March 2020 ()
- Where
- 9 km (5 mi) east of Clearlake Oaks, CA · earthquakes near Clearlake Oaks
- Magnitude
- M 1.5 (md)
- Depth
- 4.8 km below the surface
- Felt
- no reports yet
- Nearest
- Lake County, 17 km WNW
- Nearest mapped fault
- Bartlett Springs 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 2420 days ago
Earthquake alerts for Clearlake Oaks, CA
Get a notification in this browser when USGS records an earthquake near Clearlake Oaks, 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 9 km (6 mi) from the epicentre. In Clearlake Oaks, 9 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: Clearlake, Lower Lake, Clear Lake Riviera, Soda Bay, Kelseyville, Hidden Valley Lake.
How big was it?
This earthquake released about 5.6 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 2,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.6 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 230,000 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 · 46 km WNW 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 39.0303, -122.5730. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake County, CA | 17 km (11 mi) | WNW | earthquakes near Lake County |
| Colusa County, CA | 33 km (21 mi) | ENE | earthquakes near Colusa County |
| Napa County, CA | 62 km (39 mi) | SSE | earthquakes near Napa County |
| Sonoma County, CA | 64 km (40 mi) | SSW | earthquakes near Sonoma County |
| Glenn County, CA | 65 km (41 mi) | NNE | earthquakes near Glenn County |
| Yolo County, CA | 70 km (43 mi) | ESE | earthquakes near Yolo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 2.2 2km SW of North Lakeport, CA
- 1.5 2km WSW of North Lakeport, CA
- 2.0 6km NW of The Geysers, CA
- 1.6 5km WNW of The Geysers, CA
- 2.2 6km NW of The Geysers, CA
- 1.5 7km WNW of The Geysers, CA
- 2.0 4km WSW of Cobb, CA
- 2.1 8km W of Cobb, CA
- 1.5 1km NW of The Geysers, CA
- 1.6 5km WNW of The Geysers, CA
- 1.8 1km NNW of The Geysers, CA
- 1.8 7km W of Cobb, CA
- 1.7 8km WNW of Cobb, CA
- 1.9 2km NW of The Geysers, CA
- 1.8 11km SSE of Lake Pillsbury, 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.