Earthquake near Home Gardens, CA

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

At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. In Home Gardens, 4 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.

Likely felt in: Home Gardens 4 km, intensity II · Corona 7 km, intensity II · Norco 11 km, intensity II. Estimated for each town centre; each link is that town's own record.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
3. Around the size people start to feel M 3.0 92× the energy of this one
4. This earthquake M 1.7 about 10 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 11,000 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

1. 6.7 The 1918 San Jacinto, California Earthquake · 49 km E of this epicentre Apr 21, 1918
2. 6.2 3 km SE of San Bernardino, California · 34 km NE of this epicentre Jul 23, 1923
3. 6.0 The 1910 Lake Elsinore, California Earthquake · 19 km SSE of this epicentre May 15, 1910
4. 5.5 The 1990 Upland, California Earthquake · 38 km NNW of this epicentre Feb 28, 1990
5. 5.4 5km S of Chino Hills, CA · 28 km WNW 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 33.8475, -117.4933. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.6 3 km SE of Home Gardens, CA 19:36 UTC
2. 1.0 7 km NNE of Fontana, CA 19:23 UTC
3. 1.0 8 km ENE of Moreno Valley, CA 19:21 UTC
4. 1.4 3 km ESE of Nuevo, CA 07:41 UTC
5. 1.3 3 km SE of Loma Linda, CA 15:27 UTC
6. 1.3 3 km SE of Loma Linda, CA 15:24 UTC
7. 2.4 1 km E of Loma Linda, CA 06:36 UTC
8. 0.2 12 km ENE of Trabuco Canyon, CA 06:30 UTC
9. 0.6 1 km NW of Covina, CA 04:08 UTC
10. 0.9 2 km SE of Loma Linda, CA 23:35 UTC
11. 1.6 1 km SSE of Loma Linda, CA 19:39 UTC
12. 0.7 4 km NNE of Moreno Valley, CA 08:11 UTC
13. 0.9 4 km NNE of Moreno Valley, CA 07:40 UTC
14. 1.1 4 km WSW of Beaumont, CA 04:26 UTC
15. 1.0 8 km N of Rancho Cucamonga, CA 02:47 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 22:19 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.