QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

18km WNW of Bonny Doon, CA

· 8.6 km deep · released about 62 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Cruz County 31 kmSan Mateo County 34 kmSanta Clara County 59 kmAlameda County 70 kmSan Francisco County 92 kmContra Costa County 96 kmMarin County 111 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
8.6 km below the surface
Felt
6 reports · strongest reported intensity III
Nearest
Santa Cruz County, 31 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2880 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 6 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 37.1117, -122.3368. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Cruz County, CA 31 km (19 mi) WNW of here earthquakes near Santa Cruz County
San Mateo County, CA 34 km (21 mi) S of here earthquakes near San Mateo County
Santa Clara County, CA 59 km (36 mi) WSW of here earthquakes near Santa Clara County
Alameda County, CA 70 km (44 mi) SSW of here earthquakes near Alameda County
San Francisco County, CA 92 km (57 mi) SE of here earthquakes near San Francisco County
Contra Costa County, CA 96 km (60 mi) SSW of here earthquakes near Contra Costa 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. 1.7 28km WNW of Bonny Doon, CA
  2. 2.5 4km SW of Saratoga, CA
  3. 2.0 4km SW of Saratoga, CA
  4. 1.5 13km NNW of Boulder Creek, CA
  5. 1.8 32km WNW of Bonny Doon, CA
  6. 1.9 5km S of Portola Valley, CA
  7. 1.5 2km WSW of Los Altos Hills, CA
  8. 1.6 8km N of Day Valley, CA
  9. 1.7 10km WSW of Bonny Doon, CA
  10. 1.7 10km WSW of Bonny Doon, CA
  11. 2.1 11km SW of Bonny Doon, CA
  12. 1.6 10km N of Boulder Creek, CA
  13. 2.4 21km NW of Pacific Grove, CA
  14. 1.6 4km SE of Portola Valley, CA
  15. 2.3 2km E 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.

On USGS

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