Earthquake · reviewed by a seismologist
M 1.9md
18km NE of Upper Lake, CA
- When
- Magnitude
- M 1.9 (md)
- Depth
- 11 km below the surface
- Felt
- 1 report · strongest reported intensity III
- Nearest
- Lake County, 20 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3166 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.
How big was it?
This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- This earthquake M 1.9 about 21 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 39.2868, -122.7670. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Lake County, CA | 20 km (12 mi) | N of here | earthquakes near Lake County |
| Glenn County, CA | 47 km (29 mi) | SW of here | earthquakes near Glenn County |
| Colusa County, CA | 47 km (29 mi) | WNW of here | earthquakes near Colusa County |
| Mendocino County, CA | 60 km (37 mi) | ESE of here | earthquakes near Mendocino County |
| Sonoma County, CA | 86 km (53 mi) | N of here | earthquakes near Sonoma County |
| Napa County, CA | 95 km (59 mi) | NNW of here | earthquakes near Napa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
49 earthquakes have been recorded within 50 km since this one.
- 1.9 9km SE of Lake Pillsbury, CA
- 2.8 16km WNW of Lake Pillsbury, CA
- 1.8 13km SSW of Lake Pillsbury, CA
- 1.6 12km S of Lake Pillsbury, CA
- 1.9 9km WNW of Cobb, CA
- 1.6 17km SE of Lake Pillsbury, CA
- 1.6 17km NNE of Nice, CA
- 2.2 19km ENE of Clearlake, CA
- 1.5 10km SW of Kelseyville, CA
- 1.8 15km ESE of Lake Pillsbury, CA
- 1.9 8km ESE of Willits, CA
- 1.8 18km SE of Lake Pillsbury, CA
- 1.7 7km ESE of Redwood Valley, CA
- 2.0 4km NE of Lake Pillsbury, CA
- 1.6 10km 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.
For this area
The largest earthquake within 50 km in our catalogue was M 5.1 on 2016-08-10 — it released about 61,000 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.