Earthquake · reviewed by a seismologist
M 3.6mw
Earthquake near Marked Tree, AR
No earthquake was likely felt in Marked Tree in the 24 hours to 2:33 am CST (08:33 UTC). The last one was M 1.8, 8 km (5 mi) WSW, at 3:38 am CDT on 18 July 2026, estimated intensity II (weak) in town. Every earthquake near Marked Tree
This page: a magnitude 3.6 earthquake was recorded 3 km (2 mi) west-northwest of Marked Tree, AR, at 9:34 pm CDT on 29 August 2020 (02:34 UTC), 8.2 km deep. 310 people have reported feeling it to USGS.
USGS: 3 km WNW of Marked Tree, Arkansas
65 km (40 mi) NW of Memphis, TN · 37 km (23 mi) SSE of Jonesboro, AR
- When
- 9:34 pm CDT on 29 August 2020 ()
- Where
- 3 km (2 mi) west-northwest of Marked Tree, AR · earthquakes near Marked Tree
- Magnitude
- M 3.6 (mw)
- Depth
- 8.2 km below the surface
- Felt
- 310 reports · strongest reported intensity V
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Poinsett County, 21 km W
- Nearest mapped fault
- Reelfoot scarp and New Madrid seismic zone, under 1 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2195 days ago
Earthquake alerts for Marked Tree, AR
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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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 338 km (210 mi) from the epicentre. In Marked Tree, 3 km away, the estimate is intensity IV (light). 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: Manila 46 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 3.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 45,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,400× the energy of this one
- This earthquake M 3.6 about 3.8 tons of TNT
- Around the size people start to feel M 3.0 this one released 7.9× 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.
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
Epicentre 35.5387, -90.4557. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Poinsett County, AR | 21 km (13 mi) | W | earthquakes near Poinsett County |
| Craighead County, AR | 36 km (22 mi) | NNW | earthquakes near Craighead County |
| Cross County, AR | 40 km (25 mi) | SW | earthquakes near Cross County |
| Crittenden County, AR | 40 km (25 mi) | SSE | earthquakes near Crittenden County |
| Mississippi County, AR | 44 km (28 mi) | NE | earthquakes near Mississippi County |
| St. Francis County, AR | 63 km (39 mi) | SSW | earthquakes near St. Francis County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
36 earthquakes have been recorded within 50 km since this one.
- 2.8 5 km W of Dell, Arkansas
- 1.6 5 km NE of Etowah, Arkansas
- 1.6 3 km SSE of Caraway, Arkansas
- 1.7 6 km NE of Etowah, Arkansas
- 1.6 6 km NE of Etowah, Arkansas
- 3.8 6 km NE of Etowah, Arkansas
- 1.9 1 km S of Cherry Valley, Arkansas
- 1.5 5 km NNW of Victoria, Arkansas
- 1.7 6 km NW of Lepanto, Arkansas
- 1.8 7 km SSE of Manila, Arkansas
- 1.6 5 km NNE of Etowah, Arkansas
- 1.8 1 km WNW of Etowah, Arkansas
- 1.9 7 km ENE of Etowah, Arkansas
- 1.6 4 km SSE of Caraway, Arkansas
- 2.0 Arkansas
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.