Earthquake near Florence, OR

USGS: 47 km W of Dunes City, Oregon

10:00 am PDT, Sep 1, 2018 · 2018-09-01 17:00 UTC · 32 km deep · released about 54 lb of TNT

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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: 10:00 am PDT on 1 September 2018 (2018-09-01 17:00 UTC)
Where: 49 km (30 mi) W of Florence, OR · earthquakes near Florence
Magnitude: M 2.2 (ml)
Depth: 32 km below the surface
Felt: no reports yet
Nearest: Coos County, 94 km SSE
Nearest mapped fault: Heceta Bank structure, 10 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 559 days ago · we first saw it 559 days ago

A magnitude 2.2 earthquake was recorded 49 km (30 mi) W of Florence, OR, at 10:00 am PDT on 1 September 2018 (17:00 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 54 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 280,000× the energy of this one
Magna, Utah 2020 M 5.7 200,000× the energy of this one
Around the size people start to feel M 3.0 18× the energy of this one
This earthquake M 2.2 about 54 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 since 1900 lists no earthquake of M5 or more within 50 km.

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

Map loads when it scrolls into view

Epicentre 43.9105, -124.7037. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction from the epicentre
Coos County, OR	94 km (59 mi)	SSE	earthquakes near Coos County
Lincoln County, OR	103 km (64 mi)	NE	earthquakes near Lincoln County
Benton County, OR	121 km (75 mi)	ENE	earthquakes near Benton County
Polk County, OR	151 km (94 mi)	NE	earthquakes near Polk County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

2.9 62 km W of Yachats, Oregon 03:08 UTC
2.0 47 km WNW of Barview, Oregon 12:35 UTC
2.1 21 km NW of Winchester Bay, Oregon 23:19 UTC
1.7 37 km W of Yachats, Oregon 10:53 UTC
1.9 51 km W of Yachats, Oregon 23:47 UTC
2.0 72 km WNW of Barview, Oregon 04:16 UTC
1.7 72 km W of Yachats, Oregon 04:22 UTC
1.7 71 km W of Dunes City, Oregon 00:14 UTC
1.8 63 km W of Winchester Bay, Oregon 14:25 UTC
2.2 71 km W of Yachats, Oregon 22:36 UTC
2.5 66 km W of Florence, Oregon 12:56 UTC
1.9 30 km W of Yachats, Oregon 11:05 UTC
1.8 31 km W of Yachats, Oregon 13:48 UTC
1.8 31 km W of Yachats, Oregon 15:03 UTC
2.0 19 km WSW of Yachats, Oregon 09:04 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 05:21 UTC. 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.