Earthquake near Morongo Valley, 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. In Morongo Valley, 10 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.

Earthquakes near other towns within 30 km: Cabazon, Desert Hot Springs, Banning, Garnet, Palm Springs, Desert Edge.

How big was it?

This earthquake released about 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 930,000× the energy of this one
2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
3. Around the size people start to feel M 3.0 59× the energy of this one
4. This earthquake M 1.8 about 16 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 10,000 times the energy of this one.

Before 2016, the USGS record lists 37 earthquakes of M5 or more within 50 km; the five largest:

1. 7.3 The 1992 Landers, California Earthquake · 31 km NE of this epicentre Jun 28, 1992
2. 6.7 The 1918 San Jacinto, California Earthquake · 38 km SW of this epicentre Apr 21, 1918
3. 6.3 The 1992 Big Bear, California Earthquake · 26 km NNW of this epicentre Jun 28, 1992
4. 6.1 The 1992 Joshua Tree, California Earthquake · 34 km E of this epicentre Apr 23, 1992
5. 6.0 The 1948 Desert Hot Springs, California Earthquake · 32 km E of this epicentre Dec 4, 1948

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 34.0025, -116.6792. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.8 11km NNW of Big Bear Lake, CA 09:54 UTC
2. 1.9 13km WNW of Anza, CA 22:25 UTC
3. 1.6 3km SW of Calimesa, CA 15:27 UTC
4. 2.1 10km NNE of Running Springs, CA 03:10 UTC
5. 1.6 8km SE of Yucca Valley, CA 07:38 UTC
6. 1.7 6km SW of Idyllwild, CA 06:54 UTC
7. 2.4 7km ENE of Yucaipa, CA 08:04 UTC
8. 1.8 13km W of Anza, CA 10:00 UTC
9. 1.7 8km SSW of Idyllwild, CA 07:47 UTC
10. 1.7 3km NE of San Jacinto, CA 08:35 UTC
11. 1.8 9km SE of Running Springs, CA 05:07 UTC
12. 1.9 9km NNE of Banning, CA 15:35 UTC
13. 2.0 3km E of Yucca Valley, CA 15:51 UTC
14. 1.6 6km S of Redlands, CA 05:59 UTC
15. 2.1 10km WNW of Big Bear Lake, CA 21:59 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 11:32 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.