QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

4km ESE of Tres Pinos, CA

· 9.5 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Benito County 25 kmMonterey County 59 kmSanta Clara County 62 kmMerced County 68 kmSanta Cruz County 70 kmStanislaus County 91 kmAlameda 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 2.1 (md)
Depth
9.5 km below the surface
Felt
no reports yet
Nearest
San Benito County, 25 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2245 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 44 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 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 36.7733, -121.2803. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Benito County, CA 25 km (16 mi) NW of here earthquakes near San Benito County
Monterey County, CA 59 km (37 mi) N of here earthquakes near Monterey County
Santa Clara County, CA 62 km (38 mi) SE of here earthquakes near Santa Clara County
Merced County, CA 68 km (42 mi) SW of here earthquakes near Merced County
Santa Cruz County, CA 70 km (43 mi) ESE of here earthquakes near Santa Cruz County
Stanislaus County, CA 91 km (57 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

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

  1. 1.9 12km S of Tres Pinos, CA
  2. 1.6 2km NNW of San Juan Bautista, CA
  3. 2.2 10km SE of Pinnacles, CA
  4. 2.4 14km S of Tres Pinos, CA
  5. 2.1 9km N of Pinnacles, CA
  6. 2.1 4km NNW of Pinnacles, CA
  7. 2.4 4km WNW of Hollister, CA
  8. 1.6 3km E of Aromas, CA
  9. 2.0 8km SSW of Tres Pinos, CA
  10. 2.0 6km SSW of Tres Pinos, CA
  11. 2.8 16km SSE of Tres Pinos, CA
  12. 2.7 16km SSE of Tres Pinos, CA
  13. 2.4 6km SSE of San Juan Bautista, CA
  14. 2.5 5km NNW of Aromas, CA
  15. 1.5 7km ENE of Aromas, 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 7,900 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.