Earthquake near Anza, 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 8 km (5 mi) from the epicentre. In Anza, 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: Anza 4 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
3. Around the size people start to feel M 3.0 170× the energy of this one
4. This earthquake M 1.5 about 5.7 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 5.2 on 2016-06-10 — about 320,000 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. 6.7 The 1918 San Jacinto, California Earthquake · 35 km NW of this epicentre Apr 21, 1918
2. 6.0 16km WSW of Oasis, CA · 45 km ESE of this epicentre Mar 25, 1937
3. 5.5 1km ENE of Borrego Springs, CA · 45 km SE of this epicentre Apr 28, 1969
4. 5.4 20km NNW of Borrego Springs, CA · 26 km ESE of this epicentre Jul 7, 2010
5. 5.3 6km SSE of Hemet, CA · 28 km NW of this epicentre Sep 23, 1963

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 33.5318, -116.7130. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.3 22 km ESE of Anza, CA 07:12 UTC
2. 0.5 7 km SSW of Idyllwild, CA 06:55 UTC
3. 0.7 19 km ESE of Anza, CA 03:11 UTC
4. 1.1 13 km ENE of Borrego Springs, CA 03:03 UTC
5. 0.9 9 km WNW of Anza, CA 01:58 UTC
6. 1.1 9 km N of Borrego Springs, CA 01:30 UTC
7. 0.4 8 km SW of Anza, CA 00:08 UTC
8. 0.7 4 km SW of Winchester, CA 20:03 UTC
9. 1.2 11 km NE of Borrego Springs, CA 19:07 UTC
10. 1.2 9 km WNW of Anza, CA 18:43 UTC
11. 0.6 8 km WNW of Anza, CA 18:38 UTC
12. 0.0 3 km WSW of Anza, CA 17:58 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 09:32 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.