33km SSW of Smith Valley, NV

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 37 km (23 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.

Likely felt in: Topaz Ranch Estates 25 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 340,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
4. This earthquake M 3.0 about 990 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 6.0 on 2021-07-08 — about 31,000 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

1. 6.1 4 km S of Carter Springs, Nevada · 37 km NNW of this epicentre Sep 12, 1994
2. 5.2 23 km S of Walker, California · 23 km S of this epicentre Dec 19, 1919
3. 5.1 19 km W of Bridgeport, California · 32 km S of this epicentre Apr 13, 1962
4. 5.1 8 km ESE of Mesa Vista, California · 35 km NNW of this epicentre Sep 12, 1994
5. 5.0 Near Coleville, California · 8 km N of this epicentre Apr 5, 1915

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 38.5097, -119.4825. Map © OpenStreetMap contributors.

Nearby places

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.

1. 2.2 2 km N of Walker, California 08:56 UTC
2. 2.5 30km SE of Markleeville, CA 08:55 UTC
3. 1.6 5 km W of Walker, California 08:42 UTC
4. 1.9 5 km WSW of Walker, California 08:25 UTC
5. 2.6 28km SE of Markleeville, CA 08:13 UTC
6. 1.6 California-Nevada border region 08:09 UTC
7. 2.6 32km SE of Markleeville, CA 08:07 UTC
8. 2.4 30km ENE of Dardanelle, CA 08:04 UTC
9. 2.8 29km ESE of Markleeville, CA 08:01 UTC
10. 2.2 1 km ENE of Coleville, California 08:00 UTC
11. 1.9 3 km W of Walker, California 07:57 UTC
12. 1.5 5 km SSW of Coleville, California 07:54 UTC
13. 2.2 31km SE of Markleeville, CA 07:52 UTC
14. 2.3 28km ENE of Dardanelle, CA 07:44 UTC
15. 2.2 32km SE of Markleeville, CA 07:44 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 10:43 UTC. 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.