Earthquake · reviewed by a seismologist
M 3.8ml
Earthquake near Tonopah, NV
No earthquake was likely felt in Tonopah in the 24 hours to 7:49 pm PST (03:49 UTC). The last one was M 3.8, 55 km (34 mi) W, at 1:52 am PDT on 25 May 2026, estimated intensity II (weak) in town; 5 felt reports to USGS. Every earthquake near Tonopah
This page: a magnitude 3.8 earthquake was recorded 47 km (29 mi) east-northeast of Tonopah, NV, at 10:34 pm PDT on 23 July 2021 (05:34 UTC), 1.0 km deep. 2 people have reported feeling it to USGS.
USGS: 46 km ENE of Tonopah, Nevada
- When
- 10:34 pm PDT on 23 July 2021 ()
- Where
- 47 km (29 mi) east-northeast of Tonopah, NV · earthquakes near Tonopah
- Magnitude
- M 3.8 (ml)
- Depth
- 1.0 km below the surface
- Felt
- 2 reports · strongest reported intensity III
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Nye County, 32 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1867 days ago
Earthquake alerts for Tonopah, NV
Get a notification in this browser when USGS records an earthquake near Tonopah, NV. 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 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 83 km (52 mi) from the epicentre. In Tonopah, 47 km away, the estimate is intensity II (weak). 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: Tonopah 47 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 22,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
- Magna, Utah 2020 M 5.7 710× the energy of this one
- This earthquake M 3.8 about 7.6 tons of TNT
- Around the size people start to feel M 3.0 this one released 16× 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
The largest earthquake within 50 km since 2016 was M 4.2 on 2019-05-23 — about 4 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.0 49 km NNE of Tonopah, Nevada · 49 km NW of this epicentre
- 5.0 74 km E of Tonopah, Nevada · 28 km E of this epicentre
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 38.1729, -116.7154. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Nye County, NV | 32 km (20 mi) | SE | earthquakes near Nye County |
| Esmeralda County, NV | 92 km (57 mi) | WSW | earthquakes near Esmeralda County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
44 earthquakes have been recorded within 50 km since this one.
- 1.5 62 km NW of Rachel, Nevada
- 2.0 59 km NW of Rachel, Nevada
- 1.7 22 km ENE of Tonopah, Nevada
- 1.5 66 km E of Tonopah, Nevada
- 1.9 70 km NW of Rachel, Nevada
- 1.9 64 km NW of Rachel, Nevada
- 1.7 78 km ENE of Tonopah, Nevada
- 1.5 28 km ESE of Tonopah, Nevada
- 1.5 64 km NW of Rachel, Nevada
- 1.6 31 km E of Tonopah, Nevada
- 2.1 65 km NW of Rachel, Nevada
- 1.7 64 km NW of Rachel, Nevada
- 1.9 65 km E of Tonopah, Nevada
- 1.6 86 km NE of Tonopah, Nevada
- 1.5 32 km ENE of Tonopah, Nevada
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.