QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1mw

13km NNE of Tres Pinos, CA

· 8.5 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Benito County 34 kmSanta Clara County 54 kmMerced County 57 kmSanta Cruz County 69 kmMonterey County 73 kmStanislaus County 78 kmAlameda County 103 kmSan Mateo County 116 kmSan Joaquin County 116 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 3.1 (mw)
Depth
8.5 km below the surface
Felt
24 reports · strongest reported intensity III
Measured shaking
intensity V (ShakeMap)
Nearest
San Benito County, 34 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2578 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 24 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 260,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,200× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× more

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 36.8913, -121.2425. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Benito County, CA 34 km (21 mi) NNW of here earthquakes near San Benito County
Santa Clara County, CA 54 km (34 mi) SE of here earthquakes near Santa Clara County
Merced County, CA 57 km (36 mi) SW of here earthquakes near Merced County
Santa Cruz County, CA 69 km (43 mi) E of here earthquakes near Santa Cruz County
Monterey County, CA 73 km (45 mi) N of here earthquakes near Monterey County
Stanislaus County, CA 78 km (48 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

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

  1. 2.4 9km NW of Pinnacles, CA
  2. 1.6 10km N of Pinnacles, CA
  3. 1.6 3km E of Aromas, CA
  4. 2.1 4km SW of Tres Pinos, CA
  5. 1.5 12km S of Tres Pinos, CA
  6. 2.2 11km S of Tres Pinos, CA
  7. 1.8 11km S of Tres Pinos, CA
  8. 1.9 10km SE of Pinnacles, CA
  9. 2.9 10km S of Tres Pinos, CA
  10. 3.7 11km S of Tres Pinos, CA
  11. 1.9 12km S of Tres Pinos, CA
  12. 2.1 14km SSE of Tres Pinos, CA
  13. 1.6 6km E of Aromas, CA
  14. 2.8 6km SSW of Gilroy, CA
  15. 1.7 1km E of Hollister, 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 170 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.