Earthquake · reviewed by a seismologist
M 2.2mb_lg
4 km SW of Aline, OK
Yes. A magnitude 2.2 earthquake was recorded 4 km SW of Aline, OK, 55 km (34 mi) W of Enid, OK, at 3:32 am CST on 23 February 2019 (09:32 UTC), 5.0 km deep.
55 km (34 mi) W of Enid, OK · 142 km (88 mi) NW of Oklahoma City, OK
- When
- Magnitude
- M 2.2 (mb_lg)
- Depth
- 5.0 km below the surface
- Felt
- no reports yet
- Nearest
- Major County, 20 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2741 days ago
Earthquake alerts for Helena, OK
Get a notification in this browser when USGS records an earthquake near Helena, OK. 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 minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 32 km (20 mi) from the epicentre. 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: Helena 20 km, intensity II · Fairview 24 km, intensity II · Cherokee 32 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 60 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 5.8 250,000× the energy of this one
- Magna, Utah 2020 M 5.7 180,000× the energy of this one
- Around the size people start to feel M 3.0 16× the energy of this one
- This earthquake M 2.2 about 60 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
The largest earthquake within 50 km in our catalogue was M 5.1 on 2016-02-13 — about 22,000 times the energy of this one.
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 36.4831, -98.4761. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Major County, OK | 20 km (12 mi) | SSW | earthquakes near Major County |
| Alfalfa County, OK | 31 km (19 mi) | NNE | earthquakes near Alfalfa County |
| Woods County, OK | 44 km (27 mi) | NW | earthquakes near Woods County |
| Garfield County, OK | 63 km (39 mi) | E | earthquakes near Garfield County |
| Blaine County, OK | 67 km (42 mi) | S | earthquakes near Blaine County |
| Grant County, OK | 70 km (44 mi) | ENE | earthquakes near Grant County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 2.0 7 km NNE of Goltry, Oklahoma
- 2.0 5 km NNE of Cherokee, Oklahoma
- 2.1 7 km SW of Avard, Oklahoma
- 1.8 10 km ESE of Lambert, Oklahoma
- 2.1 10 km ESE of Lambert, Oklahoma
- 2.3 7 km ENE of Nescatunga, Oklahoma
- 2.2 7 km ENE of Nescatunga, Oklahoma
- 2.6 10 km ESE of Lambert, Oklahoma
- 2.5 4 km SE of Cleo Springs, Oklahoma
- 2.4 7 km NNE of Quinlan, Oklahoma
- 2.3 9 km NE of Quinlan, Oklahoma
- 2.3 8 km W of Fairview, Oklahoma
- 1.7 1 km SE of Meno, Oklahoma
- 1.5 Oklahoma
- 2.2 7 km E of Nescatunga, Oklahoma
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.