Earthquake near Mammoth Lakes, CA

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 42 km (26 mi) from the epicentre. In Mammoth Lakes, 20 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: Mammoth Lakes 20 km, intensity II · West Bishop 37 km, intensity II · Dixon Lane-Meadow Creek 39 km, intensity II · Bishop 42 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 230,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
3. Magna, Utah 2020 M 5.7 7,200× the energy of this one
4. This earthquake M 3.1 about 1,500 lb of TNT
5. Around the size people start to feel M 3.0 this one released 1.6× 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 4.4 on 2020-02-01 — about 83 times the energy of this one.

Before 2016, the USGS record lists 38 earthquakes of M5 or more within 50 km; the five largest:

1. 6.4 The 1986 Chalfant Valley, California Earthquake · 35 km E of this epicentre Jul 21, 1986
2. 6.2 9 km SW of Aspen Springs, California · 3 km E of this epicentre May 27, 1980
3. 6.1 11 km WNW of Aspen Springs, California · 9 km N of this epicentre May 25, 1980
4. 6.1 8 km W of Aspen Springs, California · 6 km NNE of this epicentre May 25, 1980
5. 6.1 4 km NNW of Round Valley, California · 21 km ESE of this epicentre Nov 23, 1984

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 37.5060, -118.8358. Map © OpenStreetMap contributors.

Nearby places

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

53 earthquakes have been recorded within 50 km since this one.

1. 2.0 17km WSW of Toms Place, CA 02:25 UTC
2. 1.5 15km WSW of Toms Place, CA 10:05 UTC
3. 1.7 16km WSW of Toms Place, CA 16:20 UTC
4. 2.3 17km WSW of Toms Place, CA 06:51 UTC
5. 1.8 15km SW of Toms Place, CA 06:39 UTC
6. 1.6 2km WNW of Dixon Lane-Meadow Creek, CA 20:42 UTC
7. 1.5 31km SSW of Round Valley, CA 05:45 UTC
8. 2.4 1km ENE of Bishop, CA 21:14 UTC
9. 1.9 17km WSW of Toms Place, CA 23:18 UTC
10. 2.4 6km N of Round Valley, CA 22:18 UTC
11. 2.5 16km WSW of Toms Place, CA 18:26 UTC
12. 1.8 9km NNW of West Bishop, CA 20:42 UTC
13. 2.6 9km ENE of Round Valley, CA 20:28 UTC
14. 2.0 30km ENE of Shaver Lake, CA 23:10 UTC
15. 1.6 17km WSW of Toms Place, CA 00:33 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:26 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.