QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

24 km WSW of Volta, California

· 2.0 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Merced County 46 kmSan Benito County 47 kmSanta Clara County 49 kmStanislaus County 62 kmSanta Cruz County 72 kmMonterey County 88 kmAlameda County 94 kmSan Joaquin County 101 kmSan Mateo County 113 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 1.8 (md)
Depth
2.0 km below the surface
Felt
no reports yet
Nearest
Merced County, 46 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3516 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 37.0268, -121.1917. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Merced County, CA 46 km (28 mi) WSW of here earthquakes near Merced County
San Benito County, CA 47 km (29 mi) NNW of here earthquakes near San Benito County
Santa Clara County, CA 49 km (31 mi) ESE of here earthquakes near Santa Clara County
Stanislaus County, CA 62 km (38 mi) SSW of here earthquakes near Stanislaus County
Santa Cruz County, CA 72 km (45 mi) E of here earthquakes near Santa Cruz County
Monterey County, CA 88 km (55 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

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

  1. 2.8 17 km SSE of Tres Pinos, California
  2. 1.8 5 km SW of Gilroy, California
  3. 2.0 20 km SSE of Tres Pinos, California
  4. 1.6 20 km SSE of Tres Pinos, California
  5. 2.1 7 km WSW of Ridgemark, California
  6. 2.1 7 km SW of Ridgemark, California
  7. 1.8 2 km WSW of San Juan Bautista, California
  8. 1.6 23 km NE of Soledad, California
  9. 1.7 11 km SSW of South Dos Palos, California
  10. 1.9 15 km SE of Tres Pinos, California
  11. 1.5 0 km W of Hollister, California
  12. 1.5 2 km WNW of Ridgemark, California
  13. 1.6 23 km SSE of Tres Pinos, California
  14. 2.2 0 km WNW of Hollister, California
  15. 1.7 27 km NE of Soledad, California

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 4.2 on 2016-07-19 — it released about 4,600 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.