QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

8 km ENE of San Martin, California

· 6.8 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Clara County 19 kmSanta Cruz County 45 kmStanislaus County 68 kmAlameda County 68 kmSan Benito County 68 kmMerced County 71 kmSan Mateo County 82 kmSan Joaquin County 94 kmContra Costa County 97 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
6.8 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Santa Clara County, 19 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3503 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 21 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 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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 37.1177, -121.5233. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Clara County, CA 19 km (12 mi) SE of here earthquakes near Santa Clara County
Santa Cruz County, CA 45 km (28 mi) ENE of here earthquakes near Santa Cruz County
Stanislaus County, CA 68 km (42 mi) SW of here earthquakes near Stanislaus County
Alameda County, CA 68 km (42 mi) SSE of here earthquakes near Alameda County
San Benito County, CA 68 km (43 mi) NW of here earthquakes near San Benito County
Merced County, CA 71 km (44 mi) W of here earthquakes near Merced 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. 2.0 7 km E of East Foothills, California
  2. 2.4 4 km ENE of Tres Pinos, California
  3. 1.5 Central California
  4. 1.7 9 km ESE of East Foothills, California
  5. 1.7 5 km ESE of Aromas, California
  6. 2.9 3 km ESE of Aromas, California
  7. 1.9 3 km WSW of San Juan Bautista, California
  8. 1.6 4 km ESE of Aromas, California
  9. 2.4 4 km ESE of Aromas, California
  10. 1.6 4 km ESE of Aromas, California
  11. 2.6 4 km ESE of Aromas, California
  12. 2.1 3 km ESE of Aromas, California
  13. 1.6 4 km ESE of Aromas, California
  14. 3.2 5 km ESE of Aromas, California
  15. 4.0 2 km ESE of Aromas, 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.

On USGS

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