7km NNE of Greenfield, CA

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
2. Magna, Utah 2020 M 5.7 580,000× the energy of this one
3. Around the size people start to feel M 3.0 51× the energy of this one
4. This earthquake M 1.9 about 19 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.

Where

Epicentre 36.3785, -121.2097. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.8 22km NNE of San Ardo, CA 14:05 UTC
2. 1.7 14km SSE of Tres Pinos, CA 05:49 UTC
3. 1.7 6km NNE of Pinnacles, CA 05:03 UTC
4. 1.6 12km SE of Pinnacles, CA 00:12 UTC
5. 1.6 15km SE of Pinnacles, CA 08:05 UTC
6. 1.9 13km S of Tres Pinos, CA 03:08 UTC
7. 2.2 13km S of Tres Pinos, CA 20:13 UTC
8. 1.9 14km WNW of Pinnacles, CA 05:03 UTC
9. 1.8 14km WNW of Pinnacles, CA 02:43 UTC
10. 2.4 6km SE of Pinnacles, CA 00:51 UTC
11. 2.0 7km ESE of Pinnacles, CA 00:51 UTC
12. 1.5 17km SSE of Tres Pinos, CA 00:08 UTC
13. 3.7 14km WNW of Pinnacles, CA 23:07 UTC
14. 2.2 7km SE of Pinnacles, CA 12:06 UTC
15. 1.5 16km SSE of Tres Pinos, CA 01:52 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 11:28 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 4.7 on 2019-10-15 — it released about 19,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.