Earthquake near Big Bear City, CA

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. 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.

Earthquakes near other towns within 30 km: Big Bear Lake, Lucerne Valley, Running Springs.

How big was it?

This earthquake released about 1.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.1 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 12,000,000× the energy of this one
2. Magna, Utah 2020 M 5.7 8,200,000× the energy of this one
3. Around the size people start to feel M 3.0 730× the energy of this one
4. This earthquake M 1.1 about 1.3 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 4.5 on 2018-05-08 — about 130,000 times the energy of this one.

Before 2016, the USGS record lists 28 earthquakes of M5 or more within 50 km; the five largest:

1. 7.3 The 1992 Landers, California Earthquake · 41 km ESE of this epicentre Jun 28, 1992
2. 6.3 The 1992 Big Bear, California Earthquake · 11 km SSE of this epicentre Jun 28, 1992
3. 6.2 3 km SE of San Bernardino, California · 43 km WSW of this epicentre Jul 23, 1923
4. 6.0 The 1986 North Palm Springs, California Earthquake · 41 km SE of this epicentre Jul 8, 1986
5. 5.8 3km NE of Yucca Valley, California · 46 km ESE of this epicentre Jun 28, 1992

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 34.2977, -116.8640. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.2 5 km SE of Cabazon, CA 23:50 UTC
2. 1.0 8 km ENE of Moreno Valley, CA 19:21 UTC
3. 1.1 10 km NNE of Banning, CA 16:37 UTC
4. 1.3 3 km SE of Loma Linda, CA 15:27 UTC
5. 1.3 3 km SE of Loma Linda, CA 15:24 UTC
6. 2.4 1 km E of Loma Linda, CA 06:36 UTC
7. 0.7 6 km N of Big Bear City, CA 06:30 UTC
8. 0.9 2 km SE of Loma Linda, CA 23:35 UTC
9. 1.6 1 km SSE of Loma Linda, CA 19:39 UTC
10. 0.5 7 km ENE of Cabazon, CA 11:10 UTC
11. 0.7 4 km NNE of Moreno Valley, CA 08:11 UTC
12. 0.9 4 km NNE of Moreno Valley, CA 07:40 UTC
13. 1.1 4 km WSW of Beaumont, CA 04:26 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 01:04 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

Revisions

USGS refines a solution as more stations report. Every change we have seen is listed here.

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.