Earthquake · reviewed by a seismologist
M 1.9md
5km NNE of Fort Bragg, CA
- When
- Magnitude
- M 1.9 (md)
- Depth
- 7.6 km below the surface
- Felt
- 3 reports · strongest reported intensity II
- Nearest
- Mendocino County, 30 km E
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1748 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.
How big was it?
This earthquake released about 19 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 5.8 810,000× the energy of this one
- Magna, Utah 2020 M 5.7 580,000× the energy of this one
- Around the size people start to feel M 3.0 51× the energy of this one
- This earthquake M 1.9 about 19 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 39.4828, -123.7892. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Mendocino County, CA | 30 km (19 mi) | W of here | earthquakes near Mendocino County |
| Lake County, CA | 99 km (62 mi) | WNW of here | earthquakes near Lake County |
| Glenn County, CA | 120 km (74 mi) | W of here | earthquakes near Glenn County |
| Sonoma County, CA | 130 km (81 mi) | NW of here | earthquakes near Sonoma 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.
- 2.1 10km SW of Laytonville, CA
- 1.6 12km SSE of Laytonville, CA
- 1.7 4km E of Willits, CA
- 1.6 21km WNW of Ukiah, CA
- 1.9 18km NNW of Laytonville, CA
- 1.8 10km SE of Willits, CA
- 1.6 10km SE of Willits, CA
- 1.8 13km N of Fort Bragg, CA
- 1.7 10km SE of Willits, CA
- 1.5 10km SE of Willits, CA
- 2.0 21km WNW of Ukiah, CA
- 1.7 10km SE of Willits, CA
- 1.8 9km NE of Laytonville, CA
- 1.7 9km SSE of Willits, CA
- 1.5 7km SW of Willits, 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 4.3 on 2017-12-14 — it released about 4,000 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.