QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

11km SW of Ridgemark, CA

· 7.0 km deep · released about 890 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Benito County 37 kmSanta Clara County 56 kmSanta Cruz County 56 kmMonterey County 59 kmMerced County 82 kmStanislaus County 99 kmAlameda County 107 kmSan Mateo County 109 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 (md)
Depth
7.0 km below the surface
Felt
19 reports · strongest reported intensity III
Nearest
San Benito County, 37 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3119 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 19 people have reported feeling it to USGS.

How big was it?

This earthquake released about 890 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 6.7 380,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 17,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 12,000× the energy of this one
  4. This earthquake M 3.0 about 890 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 36.7540, -121.4617. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Benito County, CA 37 km (23 mi) WNW of here earthquakes near San Benito County
Santa Clara County, CA 56 km (35 mi) SSE of here earthquakes near Santa Clara County
Santa Cruz County, CA 56 km (35 mi) ESE of here earthquakes near Santa Cruz County
Monterey County, CA 59 km (36 mi) NNW of here earthquakes near Monterey County
Merced County, CA 82 km (51 mi) SW of here earthquakes near Merced County
Stanislaus County, CA 99 km (61 mi) SSW of here earthquakes near Stanislaus County

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

Aftershocks so far

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

  1. 1.9 5km SSE of Tres Pinos, CA
  2. 1.6 10km S of Tres Pinos, CA
  3. 1.5 13km NNW of Pinnacles, CA
  4. 1.6 8km SSE of San Juan Bautista, CA
  5. 2.0 15km S of Tres Pinos, CA
  6. 2.0 16km SSE of Tres Pinos, CA
  7. 2.1 12km NW of Pinnacles, CA
  8. 2.0 3km ESE of Aromas, CA
  9. 3.0 2km ESE of Aromas, CA
  10. 2.2 6km NNW of Pinnacles, CA
  11. 1.8 9km ENE of San Martin, CA
  12. 2.0 9km ENE of San Martin, CA
  13. 1.8 12km SE of Pinnacles, CA
  14. 2.6 11km SE of Pinnacles, CA
  15. 2.0 16km SSE 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 250 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.