Earthquake near Day Valley, 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 10 km (6 mi) from the epicentre. In Day Valley, 7 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.

Earthquakes near other towns within 30 km: Lexington Hills, Scotts Valley, Corralitos, Aptos, Soquel, Seacliff.

How big was it?

This earthquake released about 6.4 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 2,400,000× the energy of this one
2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
3. Around the size people start to feel M 3.0 150× the energy of this one
4. This earthquake M 1.6 about 6.4 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 2022-10-25 — about 180,000 times the energy of this one.

Before 2016, the USGS record lists 29 earthquakes of M5 or more within 50 km; the five largest:

1. 6.9 The 1989 Loma Prieta, California Earthquake · 7 km S of this epicentre Oct 18, 1989
2. 6.5 Near Morgan Hill, California · 21 km E of this epicentre Jul 1, 1911
3. 6.3 22 km S of Davenport, California · 44 km SW of this epicentre Oct 22, 1926
4. 6.3 16 km SW of Davenport, California · 46 km WSW of this epicentre Oct 22, 1926
5. 6.2 Near San Jose, California · 23 km NNE of this epicentre Aug 3, 1903

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 37.1010, -121.8730. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.8 10 km ESE of Gilroy, CA 13:52 UTC
2. 3.4 10 km ESE of Gilroy, CA 08:42 UTC
3. 3.3 10 km ESE of Gilroy, CA 08:41 UTC
4. 2.5 10 km ESE of Gilroy, CA 02:06 UTC
5. 1.7 8 km ENE of Gilroy, CA 10:37 UTC
6. 1.6 13 km NNE of Morgan Hill, CA 08:49 UTC
7. 1.7 0 km SW of Day Valley, CA 00:17 UTC
8. 3.0 6 km WSW of Hollister, CA 09:08 UTC
9. 1.8 10 km ESE of Gilroy, CA 04:55 UTC
10. 1.8 16 km ESE of Seven Trees, CA 18:27 UTC
11. 1.8 6 km ESE of San Juan Bautista, CA 05:29 UTC
12. 1.8 8 km SSE of San Juan Bautista, CA 03:02 UTC
13. 2.8 16 km E of Seven Trees, CA 00:39 UTC
14. 2.1 8 km NE of Alum Rock, CA 20:41 UTC
15. 1.7 16 km E of Seven Trees, CA 10:24 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 17:19 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.