Earthquake · reviewed by a seismologist
M 2.2md
Earthquake near Truckee, CA
No earthquake was likely felt in Truckee in the 24 hours to 1:26 pm PST (21:26 UTC). The last one was M 3.3, 49 km (31 mi) S, at 3:00 am PDT on 2 October 2026, estimated intensity II (weak) in town; 532 felt reports to USGS. Every earthquake near Truckee
This page: a magnitude 2.2 earthquake was recorded 4 km (2 mi) east-southeast of Truckee, CA, at 12:56 pm PDT on 29 July 2021 (19:56 UTC), 6.9 km deep.
USGS: 4km ESE of Truckee, CA
36 km (22 mi) SW of Reno, NV
- When
- 12:56 pm PDT on 29 July 2021 ()
- Where
- 4 km (2 mi) east-southeast of Truckee, CA · earthquakes near Truckee
- Magnitude
- M 2.2 (md)
- Depth
- 6.9 km below the surface
- Felt
- no reports yet
- Nearest
- Carson City, 39 km ESE
- Nearest mapped fault
- Polaris fault, 2 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 1932 days ago
Earthquake alerts for Truckee, CA
Get a notification in this browser when USGS records an earthquake near Truckee, CA. 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. In Truckee, 4 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: Truckee 4 km, intensity II · Tahoe Vista 12 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 64 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 5.8 230,000× the energy of this one
- Magna, Utah 2020 M 5.7 170,000× the energy of this one
- Around the size people start to feel M 3.0 15× the energy of this one
- This earthquake M 2.2 about 64 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 since 2016 was M 4.7 on 2021-05-07 — about 4,400 times the energy of this one.
Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:
- 6.0 Near Reno, Nevada · 36 km NE of this epicentre
- 6.0 6 km WNW of Verdi, California · 26 km NNE of this epicentre
- 5.9 9 km NW of Truckee, California · 13 km NW of this epicentre
- 5.6 5 km NE of Loyalton, California · 44 km N of this epicentre
- 5.3 11 km N of Soda Springs, California · 25 km WNW 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 39.3212, -120.1433. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Carson City, NV | 39 km (24 mi) | ESE | earthquakes near Carson City |
| Sierra County, CA | 43 km (27 mi) | NW | earthquakes near Sierra County |
| Nevada County, CA | 54 km (34 mi) | W | earthquakes near Nevada County |
| Storey County, NV | 55 km (34 mi) | ENE | earthquakes near Storey County |
| Placer County, CA | 58 km (36 mi) | WSW | earthquakes near Placer County |
| Douglas County, NV | 65 km (41 mi) | SE | earthquakes near Douglas County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
47 earthquakes have been recorded within 50 km since this one.
- 2.8 6 km SE of Floriston, California
- 2.8 6 km SE of Floriston, California
- 1.6 6 km SE of Floriston, California
- 2.0 6 km SE of Floriston, California
- 1.5 6 km SE of Floriston, California
- 1.6 6 km SE of Floriston, California
- 2.0 32km WSW of Truckee, CA
- 1.7 20km NW of Truckee, CA
- 1.5 9 km ESE of Sparks, Nevada
- 2.1 16km WSW of Loyalton, CA
- 2.1 16km WSW of Loyalton, CA
- 1.6 16km WSW of Loyalton, CA
- 2.2 15km WSW of Loyalton, CA
- 2.4 16km WSW of Loyalton, CA
- 3.3 16km WSW of Loyalton, CA
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.