Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Laytonville, CA
No earthquake was likely felt in Laytonville in the 24 hours to 4:50 pm PST (00:50 UTC). The last one was M 2.4, 13 km (8 mi) WSW, at 7:25 am PST on 4 November 2026, estimated intensity II (weak) in town. Every earthquake near Laytonville
This page: a magnitude 1.5 earthquake was recorded 6 km (3 mi) north-northwest of Laytonville, CA, at 1:22 pm PDT on 20 April 2017 (20:22 UTC), 12 km deep.
USGS: 5 km NNW of Laytonville, California
- When
- 1:22 pm PDT on 20 April 2017 ()
- Where
- 6 km (3 mi) north-northwest of Laytonville, CA · earthquakes near Laytonville
- Magnitude
- M 1.5 (md)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Mendocino County, 34 km S
- Nearest mapped fault
- Maacama fault, under 1 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 3488 days ago
Earthquake alerts for Laytonville, CA
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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 it was probably too small to be felt, even directly above it. In Laytonville, 6 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: Covelo.
How big was it?
This earthquake released about 5.9 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 2,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
- Around the size people start to feel M 3.0 160× the energy of this one
- This earthquake M 1.5 about 5.9 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 4.1 on 2016-11-06 — about 6,200 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.9 9 km S of Leggett, California · 19 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 39.7302, -123.5187. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mendocino County, CA | 34 km (21 mi) | S | earthquakes near Mendocino County |
| Lake County, CA | 96 km (60 mi) | SE | earthquakes near Lake County |
| Glenn County, CA | 97 km (60 mi) | E | earthquakes near Glenn County |
| Trinity County, CA | 108 km (67 mi) | NNE | earthquakes near Trinity County |
| Humboldt County, CA | 114 km (71 mi) | NNW | earthquakes near Humboldt County |
| Tehama County, CA | 118 km (73 mi) | ENE | earthquakes near Tehama County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
45 earthquakes have been recorded within 50 km since this one.
- 2.2 12 km N of Brooktrails, California
- 1.8 8 km ENE of Covelo, California
- 1.5 4 km NNW of Covelo, California
- 1.6 13 km SSE of Laytonville, California
- 1.6 13 km SSE of Laytonville, California
- 1.9 12 km N of Brooktrails, California
- 1.7 14 km NNE of Brooktrails, California
- 1.7 5 km NW of Covelo, California
- 1.6 near the coast of Northern California
- 2.4 5 km WNW of Covelo, California
- 2.4 5 km WNW of Covelo, California
- 1.9 5 km WNW of Covelo, California
- 1.5 9 km NE of Willits, California
- 1.6 8 km E of Willits, California
- 1.7 9 km ESE of Willits, California
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.