Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near Redway, CA
No earthquake was likely felt in Redway in the 24 hours to 12:53 am PST (08:53 UTC). The last one was M 5.0, 153 km (95 mi) WNW, at 8:56 pm PST on 4 November 2026, estimated intensity II (weak) in town; 145 felt reports to USGS. Every earthquake near Redway
This page: a magnitude 2.1 earthquake was recorded 3 km (2 mi) north-northeast of Redway, CA, at 7:25 pm PST on 18 November 2018 (03:25 UTC), 24 km deep.
USGS: 3km NNE of Redway, CA
- When
- 7:25 pm PST on 18 November 2018 ()
- Where
- 3 km (2 mi) north-northeast of Redway, CA · earthquakes near Redway
- Magnitude
- M 2.1 (md)
- Depth
- 24 km below the surface
- Felt
- no reports yet
- Nearest
- Humboldt County, 63 km N
- Nearest mapped fault
- Bartlett Springs fault system, 21 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 2913 days ago
Earthquake alerts for Redway, CA
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Alerts are on for .
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 Redway, 3 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.
How big was it?
This earthquake released about 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
- Magna, Utah 2020 M 5.7 270,000× the energy of this one
- Around the size people start to feel M 3.0 24× the energy of this one
- This earthquake M 2.1 about 40 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 4.5 on 2016-08-28 — about 4,100 times the energy of this one.
Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:
- 7.2 The 1992 Petrolia, California Earthquake · 41 km WNW of this epicentre
- 6.0 31 km NW of Shelter Cove, California · 45 km WNW of this epicentre
- 6.0 30 km SSW of Scotia, California · 42 km WNW of this epicentre
- 5.9 9 km S of Leggett, California · 41 km S of this epicentre
- 5.5 7 km ESE of Shelter Cove, California · 23 km SW 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 40.1457, -123.8102. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Humboldt County, CA | 63 km (39 mi) | N | earthquakes near Humboldt County |
| Trinity County, CA | 81 km (50 mi) | NE | earthquakes near Trinity County |
| Mendocino County, CA | 85 km (53 mi) | SSE | earthquakes near Mendocino County |
| Glenn County, CA | 135 km (84 mi) | ESE | earthquakes near Glenn County |
| Lake County, CA | 147 km (91 mi) | SE | earthquakes near Lake County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
46 earthquakes have been recorded within 50 km since this one.
- 2.3 14km SE of Petrolia, CA
- 2.1 6km NW of Redway, CA
- 1.9 4km NNW of Redway, CA
- 2.0 9km S of Rio Dell, CA
- 1.8 15km E of Hydesville, CA
- 2.3 6km SW of Petrolia, CA
- 2.0 31km W of Hayfork, CA
- 2.0 31km W of Hayfork, CA
- 2.7 14km SE of Petrolia, CA
- 1.6 14km SE of Petrolia, CA
- 2.4 13km SE of Petrolia, CA
- 2.0 34km NE of Redway, CA
- 1.9 25km NNE of Redway, CA
- 2.0 8km ENE of Petrolia, CA
- 1.8 18km NNE of Redway, 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.
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.