Earthquake near Borrego Springs, CA

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 58 km (36 mi) from the epicentre. In Borrego Springs, 9 km away, the estimate is intensity III (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: Borrego Springs 9 km, intensity III · Julian 21 km, intensity III · San Diego Country Estates 40 km, intensity II · Pine Valley 41 km, intensity II · Salton City 44 km, intensity II · Ramona 45 km, intensity II · Anza 49 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 83,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 3,700× the energy of this one
3. Magna, Utah 2020 M 5.7 2,600× the energy of this one
4. This earthquake M 3.4 about 2 tons of TNT
5. Around the size people start to feel M 3.0 this one released 4.3× more

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 450 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. 6.6 The 1968 Borrego Mountain, California Earthquake · 29 km E of this epicentre Apr 9, 1968
2. 6.4 The 1954 San Jacinto Fault, California Earthquake · 33 km ENE of this epicentre Mar 19, 1954
3. 6.0 16km WSW of Oasis, CA · 29 km NNE of this epicentre Mar 25, 1937
4. 5.7 Eastern San Diego County, California · 29 km E of this epicentre Sep 30, 1916
5. 5.5 8km NNE of Ocotillo Wells, CA · 29 km E of this epicentre Mar 19, 1954

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 33.1780, -116.4095. 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. 1.7 20km ESE of Anza, CA 17:24 UTC
2. 2.6 4km SSW of Anza, CA 18:52 UTC
3. 2.0 15km S of Salton City, CA 23:53 UTC
4. 2.6 3km NW of Palomar Observatory, CA 00:52 UTC
5. 1.9 13km SSE of Salton City, CA 05:34 UTC
6. 2.1 7km NNW of Ocotillo Wells, CA 11:45 UTC
7. 1.6 13km SSE of Salton City, CA 10:08 UTC
8. 1.5 17km ESE of Anza, CA 20:40 UTC
9. 2.7 19km ESE of Anza, CA 14:51 UTC
10. 2.1 18km ESE of Anza, CA 14:50 UTC
11. 1.5 10km WSW of Salton City, CA 13:02 UTC
12. 2.1 10km NNE of Ocotillo Wells, CA 03:55 UTC
13. 2.2 19km ESE of Julian, CA 02:20 UTC
14. 1.5 16km S of La Quinta, CA 09:09 UTC
15. 1.9 17km ENE of Borrego Springs, CA 11:06 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 21:46 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

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.