Earthquake near Running Springs, CA

A magnitude 1.3 earthquake was recorded 5 km (3 mi) NNW of Running Springs, CA, at 6:15 pm PDT on 30 September 2026 (01:15 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Lake Arrowhead, Crestline, Highland, Mentone, Big Bear Lake, San Bernardino.

How big was it?

This earthquake released about 2.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.3 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 5,200,000× the energy of this one
2. Magna, Utah 2020 M 5.7 3,700,000× the energy of this one
3. Around the size people start to feel M 3.0 330× the energy of this one
4. This earthquake M 1.3 about 2.9 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 57,000 times the energy of this one.

Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:

1. 6.3 The 1992 Big Bear, California Earthquake · 28 km E of this epicentre Jun 28, 1992
2. 6.2 3 km SE of San Bernardino, California · 21 km SW of this epicentre Jul 23, 1923
3. 5.6 7km ENE of Running Springs, CA · 8 km E of this epicentre Oct 16, 1999
4. 5.5 11km SSE of Big Bear Lake, California · 27 km ESE of this epicentre Jun 28, 1992
5. 5.3 Near San Bernardino, California · 6 km SSE of this epicentre Sep 20, 1907

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 34.2453, -117.1322. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.4 7 km N of Big Bear City, CA 17:05 UTC
2. 1.2 7 km N of Beaumont, CA 14:17 UTC
3. 1.1 11 km E of Yucaipa, CA 09:05 UTC
4. 0.8 13 km NNW of Cabazon, CA 04:39 UTC
5. 1.2 4 km N of Rancho Cucamonga, CA 15:19 UTC
6. 0.8 12 km N of Cabazon, CA 14:34 UTC
7. 2.1 4 km W of Devore, CA 10:16 UTC
8. 1.0 2 km SSE of Loma Linda, CA 07:41 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:12 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.