Earthquake near Willow Creek, CA

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Willow Creek, 29 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.

How big was it?

This earthquake released about 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
2. Magna, Utah 2020 M 5.7 78,000× the energy of this one
3. Around the size people start to feel M 3.0 6.9× the energy of this one
4. This earthquake M 2.4 about 140 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 4.4 on 2019-02-06 — about 840 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

1. 5.6 15 km SW of Burnt Ranch, California · 48 km SSW of this epicentre Aug 20, 1927
2. 5.6 26 km NNW of Willow Creek, California · 37 km W of this epicentre Feb 13, 2012
3. 5.4 3 km NNW of Burnt Ranch, California · 31 km SSW of this epicentre Apr 30, 2008

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 41.0935, -123.3537. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.4 17km ENE of Willow Creek, CA 08:49 UTC
2. 1.8 20km SSE of Willow Creek, CA 16:10 UTC
3. 2.1 25km WNW of Weaverville, CA 11:32 UTC
4. 2.0 7km W of Willow Creek, CA 18:55 UTC
5. 2.4 14km E of Willow Creek, CA 21:27 UTC
6. 2.3 28km ENE of Willow Creek, CA 05:26 UTC
7. 2.1 26km ESE of Willow Creek, CA 06:13 UTC
8. 2.4 7km S of Somes Bar, CA 15:14 UTC
9. 3.2 16km WSW of Weitchpec, CA 07:25 UTC
10. 3.0 12km SSW of Somes Bar, CA 02:42 UTC
11. 2.1 22km E of Willow Creek, CA 08:59 UTC
12. 2.0 10km NNW of Willow Creek, CA 22:44 UTC
13. 2.1 30km WNW of Weaverville, CA 10:02 UTC
14. 2.9 30km WNW of Weaverville, CA 22:58 UTC
15. 2.5 5km SSE of Weitchpec, CA 20:09 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 05:51 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.