147 km W of Gold Beach, Oregon

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
3. Around the size people start to feel M 3.0 1.4× the energy of this one
4. This earthquake M 2.9 about 680 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 42.1918, -126.1855. Map © OpenStreetMap contributors.

Aftershocks so far

54 earthquakes have been recorded within 50 km since this one.

1. 2.5 145 km WSW of Pistol River, Oregon 21:34 UTC
2. 2.7 148 km WSW of Port Orford, Oregon 20:37 UTC
3. 3.0 189 km WSW of Port Orford, Oregon 08:40 UTC
4. 2.8 179 km WSW of Port Orford, Oregon 05:14 UTC
5. 4.1 180 km WSW of Port Orford, Oregon 03:49 UTC
6. 4.7 182 km WSW of Port Orford, Oregon 03:25 UTC
7. 5.6 189 km WSW of Port Orford, Oregon 03:23 UTC
8. 4.5 186 km WSW of Port Orford, Oregon 03:22 UTC
9. 4.0 181 km WSW of Port Orford, Oregon 03:14 UTC
10. 3.0 168 km WSW of Port Orford, Oregon 10:44 UTC
11. 2.5 152 km WSW of Port Orford, Oregon 22:22 UTC
12. 3.8 181 km WSW of Port Orford, Oregon 22:17 UTC
13. 2.5 116 km WSW of Pistol River, Oregon 05:42 UTC
14. 3.1 120 km WSW of Gold Beach, OR 12:07 UTC
15. 4.0 139 km WSW of Pistol River, Oregon 00:13 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:08 UTC. 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 5.9 on 2021-06-04 — it released about 32,000 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.