Earthquake near Santa Paula, 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 9 km (6 mi) from the epicentre. In Santa Paula, 6 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: Santa Paula 6 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
3. Around the size people start to feel M 3.0 72× the energy of this one
4. This earthquake M 1.8 about 13 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 5.1 on 2023-08-20 — about 95,000 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

1. 5.6 7km NNE of Simi Valley, California · 36 km E of this epicentre Jan 17, 1994
2. 5.5 Southwest of Tejon Pass, California · 44 km NNE of this epicentre Oct 23, 1916
3. 5.5 10 km NE of Toro Canyon, California · 43 km WNW of this epicentre Jun 29, 1926
4. 5.5 The 1941 Santa Barbara, California Earthquake · 43 km W of this epicentre Jul 1, 1941
5. 5.3 The 1973 Point Mugu, California Earthquake · 37 km S of this epicentre Feb 21, 1973

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 34.3085, -119.0948. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.1 2 km W of Chatsworth, CA 17:41 UTC
2. 1.5 1 km SSW of Chatsworth, CA 02:22 UTC
3. 1.4 1 km W of Chatsworth, CA 22:50 UTC
4. 2.3 0 km SSE of Chatsworth, CA 17:45 UTC
5. 1.4 1 km S of Chatsworth, CA 12:37 UTC
6. 1.5 7 km S of Ojai, CA 10:56 UTC
7. 1.5 20 km NW of Ojai, CA 08:44 UTC
8. 1.8 2 km SE of Chatsworth, CA 10:08 UTC
9. 0.9 12 km NNW of Chatsworth, CA 15:26 UTC
10. 1.1 18 km N of Santa Paula, CA 19:05 UTC
11. 0.8 5 km SW of Ojai, CA 01:13 UTC
12. 1.1 2 km ENE of Simi Valley, CA 15:47 UTC
13. 1.9 9 km NW of Santa Paula, CA 09:39 UTC
14. 2.2 9 km SSW of Valencia, CA 15:32 UTC
15. 2.3 5 km W of Malibu, CA 11:53 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 13:38 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.