QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

3km ESE of Aromas, CA

· 8.2 km deep · released about 990 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Cruz County 38 kmSanta Clara County 39 kmSan Benito County 56 kmMonterey County 76 kmMerced County 87 kmAlameda County 90 kmSan Mateo County 90 kmStanislaus County 94 kmContra Costa County 120 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 3.0 (ml)
Depth
8.2 km below the surface
Felt
173 reports · strongest reported intensity III
Nearest
Santa Cruz County, 38 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2365 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 173 people have reported feeling it to USGS.

How big was it?

This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 990 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 36.8773, -121.6170. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Cruz County, CA 38 km (24 mi) ESE of here earthquakes near Santa Cruz County
Santa Clara County, CA 39 km (24 mi) S of here earthquakes near Santa Clara County
San Benito County, CA 56 km (35 mi) WNW of here earthquakes near San Benito County
Monterey County, CA 76 km (47 mi) NNW of here earthquakes near Monterey County
Merced County, CA 87 km (54 mi) WSW of here earthquakes near Merced County
Alameda County, CA 90 km (56 mi) SSE of here earthquakes near Alameda County

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

Aftershocks so far

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

  1. 1.8 12km S of Tres Pinos, CA
  2. 1.6 11km S of Tres Pinos, CA
  3. 1.6 16km NW of Pinnacles, CA
  4. 1.9 7km ESE of Prunedale, CA
  5. 2.6 14km N of Morgan Hill, CA
  6. 2.0 2km NNE of Del Monte Forest, CA
  7. 1.6 6km NNW of Aromas, CA
  8. 1.6 13km NNW of Pinnacles, CA
  9. 2.9 1km ENE of Tres Pinos, CA
  10. 1.6 10km NNW of Pinnacles, CA
  11. 2.4 9km NW of Pinnacles, CA
  12. 1.6 3km E of Aromas, CA
  13. 2.1 4km SW of Tres Pinos, CA
  14. 1.5 12km S of Tres Pinos, CA
  15. 2.2 11km S of Tres Pinos, CA

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . 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 4.6 on 2017-11-13 — it released about 230 times the energy of this one.

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

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.