Earthquake · reviewed by a seismologist
M 1.8md
16km ESE of Navarro Head, CA
- When
- Magnitude
- M 1.8 (md)
- Depth
- -0.3 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Mendocino County, 34 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2406 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 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 5.8 930,000× the energy of this one
- Magna, Utah 2020 M 5.7 660,000× the energy of this one
- Around the size people start to feel M 3.0 59× 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 39.1452, -123.5913. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Mendocino County, CA | 34 km (21 mi) | SSW of here | earthquakes near Mendocino County |
| Lake County, CA | 73 km (45 mi) | W of here | earthquakes near Lake County |
| Sonoma County, CA | 90 km (56 mi) | NW of here | earthquakes near Sonoma County |
| Glenn County, CA | 114 km (71 mi) | WSW of here | earthquakes near Glenn County |
| Colusa County, CA | 117 km (73 mi) | W of here | earthquakes near Colusa County |
| Napa County, CA | 131 km (81 mi) | WNW of here | earthquakes near Napa 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.
- 2.5 6km NNE of Fort Bragg, CA
- 1.7 9km NNW of Redwood Valley, CA
- 2.3 8km NNW of Redwood Valley, CA
- 1.8 7km NE of Brooktrails, CA
- 1.8 12km WNW of Redwood Valley, CA
- 2.6 6km ESE of Redwood Valley, CA
- 1.8 20km SW of Willits, CA
- 2.2 20km SW of Willits, CA
- 2.3 13km W of Lakeport, CA
- 1.7 12km NE of Talmage, CA
- 2.3 7km SE of Talmage, CA
- 1.8 9km NNW of Redwood Valley, CA
- 1.9 12km WNW of Redwood Valley, CA
- 1.8 10km WNW of Redwood Valley, CA
- 1.8 10km WNW of Redwood Valley, 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 2019-04-29 — it released about 5,600 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.