Earthquake · reviewed by a seismologist
M 1.8md
9km WNW of Cobb, CA
- When
- Magnitude
- M 1.8 (md)
- Depth
- 1.7 km below the surface
- Felt
- no reports yet
- Nearest
- Lake County, 30 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2089 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
- Magna, Utah 2020 M 5.7 680,000× the energy of this one
- Around the size people start to feel M 3.0 61× the energy of this one
- This earthquake M 1.8 about 16 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.
Where
Epicentre 38.8418, -122.8225. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Lake County, CA | 30 km (19 mi) | SSW of here | earthquakes near Lake County |
| Sonoma County, CA | 36 km (23 mi) | NNE of here | earthquakes near Sonoma County |
| Napa County, CA | 57 km (35 mi) | NW of here | earthquakes near Napa County |
| Colusa County, CA | 63 km (39 mi) | SW of here | earthquakes near Colusa County |
| Yolo County, CA | 82 km (51 mi) | WNW of here | earthquakes near Yolo County |
| Mendocino County, CA | 85 km (53 mi) | SE of here | earthquakes near Mendocino County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 3.0 8km SSW of Kelseyville, CA
- 1.5 5km WNW of Cobb, CA
- 1.5 8km SSW of Kelseyville, CA
- 1.8 8km NW of The Geysers, CA
- 1.8 7km NW of The Geysers, CA
- 2.8 7km NW of The Geysers, CA
- 1.9 7km WNW of The Geysers, CA
- 1.7 10km WNW of The Geysers, CA
- 1.6 8km NW of The Geysers, CA
- 2.0 3km NW of Lower Lake, CA
- 2.1 2km N of The Geysers, CA
- 1.6 14km ESE of Redwood Valley, CA
- 2.3 18km NNE of Nice, CA
- 1.7 6km NW of The Geysers, CA
- 1.7 3km NE 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.
For this area
The largest earthquake within 50 km in our catalogue was M 5.0 on 2016-12-14 — it released about 63,000 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.