Earthquake near Corona, CA

A magnitude 1.0 earthquake was recorded 11 km (7 mi) S of Corona, CA, at 2:18 pm PDT on 28 September 2026 (21:18 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: El Cerrito Corona, Home Gardens, Trabuco Canyon, Rancho Santa Margarita, Norco, Lake Forest.

How big was it?

This earthquake released about 1.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.0 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 14,000,000× the energy of this one
2. Magna, Utah 2020 M 5.7 10,000,000× the energy of this one
3. Around the size people start to feel M 3.0 900× the energy of this one
4. This earthquake M 1.0 about 1.1 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 4.4 on 2018-08-29 — about 110,000 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

1. 6.4 The 1933 Long Beach, California Earthquake · 45 km WSW of this epicentre Mar 11, 1933
2. 6.2 3 km SE of San Bernardino, California · 44 km NE of this epicentre Jul 23, 1923
3. 6.0 The 1910 Lake Elsinore, California Earthquake · 16 km ESE of this epicentre May 15, 1910
4. 5.5 The 1990 Upland, California Earthquake · 43 km NNW of this epicentre Feb 28, 1990
5. 5.4 5km S of Chino Hills, CA · 27 km NW of this epicentre Jul 29, 2008

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 33.7802, -117.5485. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.2 2 km SE of Home Gardens, CA 19:00 UTC
2. 1.5 5 km SSE of Home Gardens, CA 22:21 UTC
3. 1.3 7 km SSE of Home Gardens, CA 17:10 UTC
4. 1.2 4 km N of Rancho Cucamonga, CA 15:19 UTC
5. 1.0 2 km SSE of Loma Linda, CA 07:41 UTC
6. 1.2 2 km ESE of Home Gardens, CA 20:35 UTC
7. 0.9 6 km SE of Ontario, CA 17:23 UTC
8. 1.6 3 km SE of Loma Linda, CA 13:59 UTC
9. 0.8 3 km ENE of Fontana, CA 05:53 UTC
10. 0.7 7 km SW of Beaumont, CA 21:39 UTC
11. 2.2 3 km SSE of Costa Mesa, CA 10:17 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.