QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

2km E of Saratoga, CA

· 6.5 km deep · released about 62 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Cruz County 28 kmSanta Clara County 28 kmSan Mateo County 37 kmAlameda County 44 kmContra Costa County 73 kmStanislaus County 94 kmSan Joaquin County 99 kmSan Francisco County 105 kmSan Benito County 109 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 2.2 (md)
Depth
6.5 km below the surface
Felt
48 reports · strongest reported intensity IV
Nearest
Santa Cruz County, 28 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1868 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 48 people have reported feeling it to USGS.

How big was it?

This earthquake released about 62 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 240,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 170,000× the energy of this one
  3. Around the size people start to feel M 3.0 15× the energy of this one
  4. This earthquake M 2.2 about 62 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 37.2605, -122.0012. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Cruz County, CA 28 km (17 mi) N of here earthquakes near Santa Cruz County
Santa Clara County, CA 28 km (17 mi) W of here earthquakes near Santa Clara County
San Mateo County, CA 37 km (23 mi) ESE of here earthquakes near San Mateo County
Alameda County, CA 44 km (27 mi) S of here earthquakes near Alameda County
Contra Costa County, CA 73 km (46 mi) S of here earthquakes near Contra Costa County
Stanislaus County, CA 94 km (59 mi) WSW of here earthquakes near Stanislaus 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. 2.0 5km E of Fremont, CA
  2. 1.8 10km ENE of Morgan Hill, CA
  3. 2.1 7km NE of San Martin, CA
  4. 2.6 8km ENE of Alum Rock, CA
  5. 1.9 22km NE of Morgan Hill, CA
  6. 1.6 4km ENE of Burlingame, CA
  7. 2.3 6km SSW of Gilroy, CA
  8. 1.6 10km NE of Milpitas, CA
  9. 1.6 9km SE of Sunol, CA
  10. 2.8 16km SSE of Livermore, CA
  11. 1.6 3km W of Fruitdale, CA
  12. 1.5 11km WSW of Saratoga, CA
  13. 1.6 11km WSW of Saratoga, CA
  14. 1.7 11km WSW of Saratoga, CA
  15. 2.5 16km SSW of Bonny Doon, 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 4.1 on 2017-10-10 — it released about 660 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.