QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3mw

25 km W of Los Banos, CA

· 4.3 km deep · released about 1.5 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Merced County 40 kmSan Benito County 48 kmSanta Clara County 53 kmStanislaus County 59 kmSanta Cruz County 78 kmMonterey County 91 kmAlameda County 96 kmSan Joaquin County 100 kmSan Mateo County 117 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 3.3 (mw)
Depth
4.3 km below the surface
Felt
16 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
Nearest
Merced County, 40 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 388 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 16 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,500× the energy of this one
  4. This earthquake M 3.3 about 1.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.2× 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 37.0422, -121.1320. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Merced County, CA 40 km (25 mi) WSW of here earthquakes near Merced County
San Benito County, CA 48 km (30 mi) N of here earthquakes near San Benito County
Santa Clara County, CA 53 km (33 mi) ESE of here earthquakes near Santa Clara County
Stanislaus County, CA 59 km (37 mi) S of here earthquakes near Stanislaus County
Santa Cruz County, CA 78 km (48 mi) E of here earthquakes near Santa Cruz County
Monterey County, CA 91 km (56 mi) N of here earthquakes near Monterey County

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

Aftershocks so far

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

  1. 1.9 12 km SSW of Tres Pinos, CA
  2. 3.7 11 km S of Tres Pinos, CA
  3. 1.7 29 km NNE of Pinnacles, CA
  4. 1.7 10 km SSW of Tres Pinos, CA
  5. 1.6 2 km WSW of Ridgemark, CA
  6. 2.2 10 km NE of San Martin, CA
  7. 1.8 6 km SSW of Gilroy, CA
  8. 1.7 2 km E of Aromas, CA
  9. 1.6 11 km SW of Ridgemark, CA
  10. 2.2 4 km SE of Aromas, CA
  11. 1.9 4 km SE of Aromas, CA
  12. 2.6 15 km S of Tres Pinos, CA
  13. 2.0 9 km NE of Pinnacles, CA
  14. 2.1 13 km NW of Pinnacles, CA
  15. 2.0 11 km SW of Ridgemark, 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 4.7 on 2019-10-15 — it released about 110 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.