QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

23 km NE of Greenfield, California

· 6.5 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Benito County 18 kmMonterey County 35 kmMerced County 87 kmSanta Clara County 103 kmSanta Cruz County 106 kmKings County 118 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 1.9 (md)
Depth
6.5 km below the surface
Felt
no reports yet
Nearest
San Benito County, 18 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3259 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 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 580,000× the energy of this one
  3. Around the size people start to feel M 3.0 51× the energy of this one
  4. This earthquake M 1.9 about 19 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 36.4563, -121.0380. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Benito County, CA 18 km (11 mi) SSE of here earthquakes near San Benito County
Monterey County, CA 35 km (21 mi) NE of here earthquakes near Monterey County
Merced County, CA 87 km (54 mi) SSW of here earthquakes near Merced County
Santa Clara County, CA 103 km (64 mi) SE of here earthquakes near Santa Clara County
Santa Cruz County, CA 106 km (66 mi) SE of here earthquakes near Santa Cruz County
Kings County, CA 118 km (73 mi) WNW of here earthquakes near Kings 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. 2.9 16 km SSE of Tres Pinos, California
  2. 1.9 17 km SSE of Tres Pinos, California
  3. 2.0 14 km SSE of Tres Pinos, California
  4. 1.8 16 km SSE of Tres Pinos, California
  5. 1.5 23 km ENE of San Lucas, California
  6. 2.0 17 km SSE of Tres Pinos, California
  7. 1.9 Central California
  8. 1.8 17 km SSE of Tres Pinos, California
  9. 1.9 17 km SSE of Tres Pinos, California
  10. 2.8 16 km SSE of Tres Pinos, California
  11. 1.9 17 km SSE of Tres Pinos, California
  12. 2.1 18 km SSE of Tres Pinos, California
  13. 2.1 18 km SSE of Tres Pinos, California
  14. 1.9 18 km SSE of Tres Pinos, California
  15. 1.6 16 km SSE of Tres Pinos, 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 3,500 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.