QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

20km SW of Gustine, CA

· 4.8 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Merced County 37 kmStanislaus County 51 kmSanta Clara County 51 kmSan Benito County 56 kmSanta Cruz County 79 kmAlameda County 91 kmSan Joaquin County 92 kmMonterey County 99 kmSan Mateo County 115 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 2.1 (md)
Depth
4.8 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Merced County, 37 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2196 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 47 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 37.1130, -121.1262. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Merced County, CA 37 km (23 mi) WSW of here earthquakes near Merced County
Stanislaus County, CA 51 km (32 mi) SSW of here earthquakes near Stanislaus County
Santa Clara County, CA 51 km (32 mi) ESE of here earthquakes near Santa Clara County
San Benito County, CA 56 km (35 mi) N of here earthquakes near San Benito County
Santa Cruz County, CA 79 km (49 mi) E of here earthquakes near Santa Cruz County
Alameda County, CA 91 km (57 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

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

  1. 1.8 4km S of San Juan Bautista, CA
  2. 1.6 3km E of Aromas, CA
  3. 1.8 6km WSW of Gilroy, CA
  4. 1.7 7km WSW of Gilroy, CA
  5. 2.8 6km SSE of San Juan Bautista, CA
  6. 1.8 4km SSE of San Juan Bautista, CA
  7. 3.0 5km S of San Juan Bautista, CA
  8. 3.3 4km S of San Juan Bautista, CA
  9. 2.1 4km S of San Juan Bautista, CA
  10. 1.6 30km NE of Pinnacles, CA
  11. 2.1 32km NE of Pinnacles, CA
  12. 1.7 8km SSW of Tres Pinos, CA
  13. 1.7 3km E of Aromas, CA
  14. 1.6 7km S of Gilroy, CA
  15. 2.1 6km SE 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.

On USGS

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