221 km W of Crescent City, California

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
3. Around the size people start to feel M 3.0 5.6× the energy of this one
4. This earthquake M 2.5 about 170 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 41.4164, -126.8213. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.8 250 km WSW of Crescent City, California 06:11 UTC
2. 2.9 231 km WSW of Pistol River, Oregon 22:57 UTC
3. 3.0 253 km W of Indianola, California 11:12 UTC
4. 3.4 233 km WSW of Pistol River, Oregon 05:31 UTC
5. 3.1 204 km WSW of Pistol River, Oregon 08:15 UTC
6. 3.2 210 km WSW of Pistol River, Oregon 05:26 UTC
7. 2.6 243 km W of Crescent City, California 17:14 UTC
8. 2.6 243 km WSW of Pistol River, Oregon 04:02 UTC
9. 2.9 184 km WSW of Pistol River, Oregon 17:32 UTC
10. 4.5 209 km WSW of Pistol River, Oregon 03:06 UTC
11. 4.2 210 km WSW of Pistol River, Oregon 23:07 UTC
12. 3.8 208 km WSW of Pistol River, Oregon 00:08 UTC
13. 2.9 229 km WSW of Pistol River, Oregon 18:42 UTC
14. 2.6 215 km WSW of Pistol River, Oregon 02:13 UTC
15. 2.6 198 km WSW of Pistol River, Oregon 14:50 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 18:30 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 5.6 on 2018-07-24 — it released about 45,000 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.