Earthquake near Julian, 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 45 km (28 mi) from the epicentre. In Julian, 15 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: Julian 15 km, intensity III · Borrego Springs 25 km, intensity II · Pine Valley 25 km, intensity II · San Diego Country Estates 32 km, intensity II · Alpine 37 km, intensity II · Ramona 39 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1,800 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 190,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 8,500× the energy of this one
3. Magna, Utah 2020 M 5.7 6,000× the energy of this one
4. This earthquake M 3.2 about 1,800 lb of TNT
5. Around the size people start to feel M 3.0 this one released 1.9× 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 1,000 times the energy of this one.

Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:

1. 6.6 The 1968 Borrego Mountain, California Earthquake · 36 km ENE of this epicentre Apr 9, 1968
2. 6.4 The 1954 San Jacinto Fault, California Earthquake · 45 km NE of this epicentre Mar 19, 1954
3. 6.0 16km WSW of Oasis, CA · 44 km NNE of this epicentre Mar 25, 1937
4. 5.7 Eastern San Diego County, California · 37 km ENE of this epicentre Sep 30, 1916
5. 5.5 8km NNE of Ocotillo Wells, CA · 38 km ENE 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 33.0375, -116.4467. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.2 8km N of Lake Henshaw, CA 10:21 UTC
2. 1.6 12km ENE of Borrego Springs, CA 15:24 UTC
3. 2.3 8km NNE of Borrego Springs, CA 14:10 UTC
4. 1.8 12km NNE of Ocotillo Wells, CA 14:38 UTC
5. 2.2 7km NNE of Borrego Springs, CA 23:41 UTC
6. 2.4 14km W of Salton City, CA 23:38 UTC
7. 2.1 14km W of Salton City, CA 16:26 UTC
8. 2.3 10km SW of Salton City, CA 05:08 UTC
9. 2.1 8km ENE of Borrego Springs, CA 05:34 UTC
10. 2.4 7km SE of Julian, CA 18:25 UTC
11. 1.7 6km NNE of Borrego Springs, CA 21:53 UTC
12. 1.8 18km N of Borrego Springs, CA 03:55 UTC
13. 2.0 11km NE of Ocotillo Wells, CA 07:00 UTC
14. 1.6 19km NNW of Borrego Springs, CA 02:38 UTC
15. 1.7 14 km S of Alpine Village, California 02:51 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 11:44 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.