QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

15km S of Bonny Doon, CA

· 6.5 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Cruz County 19 kmSanta Clara County 56 kmSan Mateo County 59 kmAlameda County 86 kmSan Benito County 103 kmMonterey County 107 kmContra Costa County 114 kmSan Francisco 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 2.1 (md)
Depth
6.5 km below the surface
Felt
no reports yet
Nearest
Santa Cruz County, 19 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2900 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 47 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 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 36.9077, -122.1810. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Cruz County, CA 19 km (12 mi) SW of here earthquakes near Santa Cruz County
Santa Clara County, CA 56 km (35 mi) SW of here earthquakes near Santa Clara County
San Mateo County, CA 59 km (37 mi) SSE of here earthquakes near San Mateo County
Alameda County, CA 86 km (53 mi) SSW of here earthquakes near Alameda County
San Benito County, CA 103 km (64 mi) WNW of here earthquakes near San Benito County
Monterey County, CA 107 km (67 mi) NW of here earthquakes near Monterey County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.4 21km NW of Pacific Grove, CA
  2. 1.6 4km SE of Portola Valley, CA
  3. 1.8 8km E of Interlaken, CA
  4. 2.3 2km E of Bonny Doon, CA
  5. 2.0 7km WSW of Gilroy, CA
  6. 1.6 20km WNW of Boulder Creek, CA
  7. 1.8 21km W of Boulder Creek, CA
  8. 2.5 20km WNW of Boulder Creek, CA
  9. 2.8 21km WNW of Boulder Creek, CA
  10. 1.9 20km WNW of Boulder Creek, CA
  11. 2.2 5km WSW of Cupertino, CA
  12. 2.9 3km NNE of Corralitos, CA
  13. 2.0 5km NW of Del Monte Forest, CA
  14. 1.9 3km S of Loyola, CA
  15. 1.7 7km WSW of Gilroy, 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.