Earthquake · reviewed by a seismologist
M 3.0ml
Earthquake near Harbor, OR
No earthquake was likely felt in Harbor in the 24 hours to 10:09 am PST (18:09 UTC). The last one was M 1.7, 3 km (2 mi) WNW, at 1:29 pm PDT on 23 October 2026, estimated intensity II (weak) in town. Every earthquake near Harbor
This page: a magnitude 3.0 earthquake was recorded 3 km (2 mi) south of Harbor, OR, at 5:31 pm PDT on 30 September 2018 (00:31 UTC), 16 km deep. 6 people have reported feeling it to USGS.
USGS: 3 km S of Harbor, Oregon
- When
- 5:31 pm PDT on 30 September 2018 ()
- Where
- 3 km (2 mi) south of Harbor, OR · earthquakes near Harbor
- Magnitude
- M 3.0 (ml)
- Depth
- 16 km below the surface
- Felt
- 6 reports · strongest reported intensity III
- Nearest
- Del Norte County, 39 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2890 days ago
Earthquake alerts for Harbor, OR
Get a notification in this browser when USGS records an earthquake near Harbor, OR. No account or email needed.
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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 32 km (20 mi) from the epicentre. In Harbor, 3 km away, the estimate is intensity III (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.
Likely felt in: Brookings 4 km, intensity III · Crescent City 30 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 920 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 370,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
- Magna, Utah 2020 M 5.7 12,000× the energy of this one
- This earthquake M 3.0 about 920 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.9 5 km NNE of Hiouchi, California · 28 km SE 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 42.0223, -124.2715. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Del Norte County, CA | 39 km (24 mi) | SE | earthquakes near Del Norte County |
| Curry County, OR | 50 km (31 mi) | N | earthquakes near Curry County |
| Josephine County, OR | 70 km (44 mi) | NE | earthquakes near Josephine County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 2.9 9 km E of Pistol River, Oregon
- 2.6 18 km SSW of Brookings, OR
- 2.2 9 km S of Pistol River, Oregon
- 1.8 5 km SW of Brookings, Oregon
- 1.6 16 km SW of Pistol River, Oregon
- 1.5 18 km W of Pistol River, Oregon
- 1.7 19 km W of Pistol River, Oregon
- 1.8 9 km SE of Pistol River, Oregon
- 1.9 11 km W of Smith River, California
- 2.9 14 km W of Pistol River, Oregon
- 1.6 3 km ENE of Harbor, Oregon
- 1.8 6 km NW of Brookings, Oregon
- 1.6 41 km WSW of Brookings, Oregon
- 2.0 13 km NW of Brookings, Oregon
- 1.9 16 km W of Crescent City, 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.