Earthquake · reviewed by a seismologist
M 1.9ml
11 km SSW of Alex, Oklahoma
- When
- Magnitude
- M 1.9 (ml)
- Depth
- 14 km below the surface
- Felt
- no reports yet
- Nearest
- Grady County, 23 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2084 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
- Magna, Utah 2020 M 5.7 580,000× the energy of this one
- Around the size people start to feel M 3.0 51× the energy of this one
- This earthquake M 1.9 about 19 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 34.8208, -97.8200. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Grady County, OK | 23 km (14 mi) | SSE of here | earthquakes near Grady County |
| Stephens County, OK | 38 km (24 mi) | N of here | earthquakes near Stephens County |
| McClain County, OK | 40 km (25 mi) | WSW of here | earthquakes near McClain County |
| Garvin County, OK | 48 km (30 mi) | WNW of here | earthquakes near Garvin County |
| Cleveland County, OK | 62 km (39 mi) | SW of here | earthquakes near Cleveland County |
| Comanche County, OK | 63 km (39 mi) | ENE of here | earthquakes near Comanche County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
4 earthquakes have been recorded within 50 km since this one.
- 2.0 8 km ESE of Chickasha, Oklahoma
- 1.5 2 km SE of Chickasha, Oklahoma
- 1.8 5 km W of Ratliff City, Oklahoma
- 1.5 10 km SSW of Alex, 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.