quarry blast · reviewed by a seismologist
M 1.8ml
6.7 km ESE of Woodall, OK
No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 1.8 quarry blast was recorded 6.7 km ESE of Woodall, OK, 75 km (47 mi) ESE of Tulsa, OK, at 2:03 pm CST on 17 November 2020 (20:03 UTC), less than 1 km deep.
75 km (47 mi) ESE of Tulsa, OK
- When
- Magnitude
- M 1.8 (ml)
- Depth
- 0.0 km below the surface
- Felt
- no reports yet
- Nearest
- Cherokee County, 13 km ENE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2184 days ago
Earthquake alerts for Fort Gibson, OK
Get a notification in this browser when USGS records an earthquake near Fort Gibson, 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 17 km (11 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.
Earthquakes near other towns within 30 km: Fort Gibson, Tahlequah, Park Hill, Wagoner, Muskogee.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
- Magna, Utah 2020 M 5.7 680,000× the energy of this one
- Around the size people start to feel M 3.0 61× the energy of this one
- This earthquake M 1.8 about 16 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 35.8682, -95.1303. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Cherokee County, OK | 13 km (8 mi) | ENE | earthquakes near Cherokee County |
| Muskogee County, OK | 36 km (22 mi) | SW | earthquakes near Muskogee County |
| Wagoner County, OK | 36 km (22 mi) | WNW | earthquakes near Wagoner County |
| Adair County, OK | 43 km (27 mi) | E | earthquakes near Adair County |
| Mayes County, OK | 49 km (31 mi) | N | earthquakes near Mayes County |
| Sequoyah County, OK | 53 km (33 mi) | SE | earthquakes near Sequoyah County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 2.0 2 km SW of Hulbert, Oklahoma
- 1.6 1 km ESE of Zeb, Oklahoma
- 1.9 4 km SW of Hulbert, Oklahoma
- 1.9 2 km N of Sportsmen Acres, Oklahoma
- 1.6 2 km E of Sportsmen Acres, Oklahoma
- 1.7 4 km SW of Hulbert, Oklahoma
- 1.8 3 km NE of Sportsmen Acres, Oklahoma
- 1.9 3 km SE of Zeb, Oklahoma
- 1.8 Oklahoma
- 1.5 1 km SSW of Hulbert, Oklahoma
- 1.9 3 km S of Hulbert, Oklahoma
- 1.9 3 km SW of Hulbert, Oklahoma
- 1.8 2 km ENE of Sportsmen Acres, Oklahoma
- 1.5 4 km NE of Sportsmen Acres, Oklahoma
- 1.8 1 km SSE of Zeb, 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.