Earthquake near Calimesa, CA

A magnitude 0.9 earthquake was recorded 5 km (3 mi) ESE of Calimesa, CA, at 10:49 pm PDT on 27 September 2026 (05:49 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Cherry Valley, Yucaipa, Beaumont, Banning, Mentone, Redlands.

How big was it?

This earthquake released about 0.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 1.9 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 19,000,000× the energy of this one
2. Magna, Utah 2020 M 5.7 13,000,000× the energy of this one
3. Around the size people start to feel M 3.0 1,200× the energy of this one
4. This earthquake M 0.9 about 0.8 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 200,000 times the energy of this one.

Before 2016, the USGS record lists 24 earthquakes of M5 or more within 50 km; the five largest:

1. 6.7 The 1918 San Jacinto, California Earthquake · 26 km S of this epicentre Apr 21, 1918
2. 6.3 The 1992 Big Bear, California Earthquake · 28 km NE of this epicentre Jun 28, 1992
3. 6.2 3 km SE of San Bernardino, California · 26 km WNW of this epicentre Jul 23, 1923
4. 6.0 The 1910 Lake Elsinore, California Earthquake · 49 km SW of this epicentre May 15, 1910
5. 6.0 The 1986 North Palm Springs, California Earthquake · 37 km E of this epicentre Jul 8, 1986

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 33.9942, -117.0047. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 0.5 8 km SW of Idyllwild, CA 07:14 UTC
2. 0.8 13 km NNW of Cabazon, CA 04:39 UTC
3. 0.6 7 km ESE of Valle Vista, CA 04:29 UTC
4. 1.5 5 km SSE of Home Gardens, CA 22:21 UTC
5. 1.3 7 km SSE of Home Gardens, CA 17:10 UTC
6. 1.7 5 km NW of Idyllwild, CA 16:58 UTC
7. 1.4 5 km NW of Idyllwild, CA 16:58 UTC
8. 0.6 8 km SSW of Idyllwild, CA 15:19 UTC
9. 0.8 12 km N of Cabazon, CA 14:34 UTC
10. 0.1 9 km NNW of Anza, CA 14:28 UTC
11. 2.1 4 km W of Devore, CA 10:16 UTC
12. 0.6 8 km S of Idyllwild, CA 07:58 UTC
13. 1.0 2 km SSE of Loma Linda, CA 07:41 UTC
14. 0.9 8 km ESE of Valle Vista, CA 01:53 UTC
15. 1.3 5 km NNW of Running Springs, CA 01:15 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:10 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.