Earthquake · reviewed by a seismologist
M 1.8md
Earthquake near Redway, CA
No earthquake was likely felt in Redway in the 24 hours to 10:21 pm PST (06:21 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 1.8 earthquake was recorded 29 km (18 mi) south-southwest of Redway, CA, at 5:23 am PDT on 9 June 2023 (12:23 UTC), 3.5 km deep.
USGS: 18km SSE of Shelter Cove, CA
- When
- 5:23 am PDT on 9 June 2023 ()
- Where
- 29 km (18 mi) south-southwest of Redway, CA · earthquakes near Redway
- Magnitude
- M 1.8 (md)
- Depth
- 3.5 km below the surface
- Felt
- no reports yet
- Nearest
- Mendocino County, 68 km SE
- Nearest mapped fault
- San Andreas fault, 3 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 1251 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, people at rest would likely notice it out to about 13 km (8 mi) from the epicentre. In Redway, 29 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 15 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 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 710,000× the energy of this one
- Around the size people start to feel M 3.0 63× the energy of this one
- This earthquake M 1.8 about 15 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 4.3 on 2017-12-14 — about 4,900 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.0 44 km SW of Shelter Cove, California · 41 km WSW of this epicentre
- 6.0 31 km NW of Shelter Cove, California · 48 km NW of this epicentre
- 6.0 30 km SSW of Scotia, California · 48 km NNW of this epicentre
- 5.9 9 km S of Leggett, California · 24 km ESE of this epicentre
- 5.9 29 km W of Shelter Cove, California · 42 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 39.8887, -123.9768. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mendocino County, CA | 68 km (42 mi) | SE | earthquakes near Mendocino County |
| Humboldt County, CA | 91 km (57 mi) | N | earthquakes near Humboldt County |
| Trinity County, CA | 112 km (69 mi) | NE | earthquakes near Trinity County |
| Lake County, CA | 137 km (85 mi) | SE | earthquakes near Lake County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
32 earthquakes have been recorded within 50 km since this one.
- 2.8 19 km E of Petrolia, CA
- 3.0 19 km E of Petrolia, CA
- 4.8 20 km E of Petrolia, CA
- 2.2 9 km NNE of Rockport, CA
- 1.6 14 km NW of Laytonville, CA
- 1.7 10 km SSE of Redway, CA
- 2.3 14 km NW of Laytonville, CA
- 2.3 6 km W of Laytonville, CA
- 1.7 7 km WSW of Laytonville, CA
- 2.3 4 km ESE of Redway, CA
- 2.9 14 km S of Redway, CA
- 2.1 14 km SE of Petrolia, CA
- 1.9 15 km SE of Petrolia, CA
- 1.6 14 km SE of Petrolia, CA
- 1.7 11 km SSE 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.