QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

26 km SW of Gustine, CA

· 6.4 km deep · released about 1,500 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Merced County 43 kmSanta Clara County 48 kmSan Benito County 52 kmStanislaus County 56 kmSanta Cruz County 74 kmAlameda County 90 kmMonterey County 94 kmSan Joaquin County 96 kmSan Mateo County 112 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 (ml)
Depth
6.4 km below the surface
Felt
7 reports · strongest reported intensity II
Nearest
Merced County, 43 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 848 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,500 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 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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 37.0772, -121.1830. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Merced County, CA 43 km (27 mi) WSW of here earthquakes near Merced County
Santa Clara County, CA 48 km (30 mi) ESE of here earthquakes near Santa Clara County
San Benito County, CA 52 km (33 mi) N of here earthquakes near San Benito County
Stanislaus County, CA 56 km (35 mi) SSW of here earthquakes near Stanislaus County
Santa Cruz County, CA 74 km (46 mi) E of here earthquakes near Santa Cruz County
Alameda County, CA 90 km (56 mi) SE of here earthquakes near Alameda County

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. 2.4 5 km SSW of Gilroy, CA
  2. 1.6 13 km S of San Juan Bautista, CA
  3. 2.0 13 km SSE of San Juan Bautista, CA
  4. 2.4 20 km SSW of Los Banos, CA
  5. 1.7 6 km SSW of Ridgemark, CA
  6. 1.7 19 km ESE of Tres Pinos, CA
  7. 1.6 6 km SSW of Ridgemark, CA
  8. 2.1 6 km SW of Ridgemark, CA
  9. 2.1 15 km E of Seven Trees, CA
  10. 1.8 5 km of Aromas, CA
  11. 1.5 2 km ESE of Aromas, CA
  12. 1.7 6 km WSW of Gilroy, CA
  13. 2.0 5 km SE of Tres Pinos, CA
  14. 2.1 10 km SW of Tres Pinos, CA
  15. 1.9 23 km SW of South Dos Palos, 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 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.