203 km W of Bandon, Oregon

2023-03-27 04:53 UTC · 17 km deep · released about 15 tons of TNT

Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.

When: 2023-03-27 04:53 UTC
Magnitude: M 4.0 (mb)
Depth: 17 km below the surface
Felt: 5 reports · strongest reported intensity IV
Status: Reviewed by a seismologist

USGS · last changed by USGS 1213 days ago · we first saw it 1213 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

Northridge, California 1994 M 6.7 11,000× the energy of this one
Mineral, Virginia 2011 M 5.8 500× the energy of this one
Magna, Utah 2020 M 5.7 350× the energy of this one
This earthquake M 4.0 about 15 tons of TNT
Around the size people start to feel M 3.0 this one released 32× more

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

Map loads when it scrolls into view

Epicentre 43.3446, -126.8961. Map © OpenStreetMap contributors.

Aftershocks so far

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

3.2 206 km W of Bandon, Oregon 02:46 UTC
2.7 180 km W of Langlois, Oregon 11:41 UTC
4.7 194 km W of Bandon, Oregon 05:36 UTC
2.9 163 km W of Port Orford, Oregon 16:45 UTC
3.2 219 km W of Langlois, Oregon 04:22 UTC
3.0 207 km W of Bandon, Oregon 04:03 UTC
3.2 197 km W of Bandon, Oregon 13:38 UTC
4.4 225 km W of Bandon, Oregon 13:24 UTC
3.1 242 km W of Bandon, Oregon 05:01 UTC
2.9 212 km W of Bandon, Oregon 01:55 UTC
4.6 234 km W of Bandon, Oregon 01:52 UTC
3.2 176 km W of Bandon, Oregon 13:43 UTC
3.7 201 km W of Langlois, Oregon 20:23 UTC
2.8 187 km WNW of Bandon, Oregon 14:24 UTC
4.4 217 km WNW of Bandon, Oregon 03:25 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:33 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 5.7 on 2020-12-29 — it released about 350 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.