QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

7 km N of Boulder Creek, California

· 13 km deep · released about 6.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Cruz County 23 kmSan Mateo County 33 kmSanta Clara County 38 kmAlameda County 53 kmContra Costa County 82 kmSan Francisco County 100 kmStanislaus County 107 kmMarin County 110 kmSan Joaquin 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 1.6 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Santa Cruz County, 23 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3344 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 6.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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 37.1977, -122.1195. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Cruz County, CA 23 km (14 mi) NNW of here earthquakes near Santa Cruz County
San Mateo County, CA 33 km (20 mi) SE of here earthquakes near San Mateo County
Santa Clara County, CA 38 km (24 mi) W of here earthquakes near Santa Clara County
Alameda County, CA 53 km (33 mi) SSW of here earthquakes near Alameda County
Contra Costa County, CA 82 km (51 mi) S of here earthquakes near Contra Costa County
San Francisco County, CA 100 km (62 mi) SE of here earthquakes near San Francisco County

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

Aftershocks so far

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

  1. 1.9 6 km ENE of East Foothills, California
  2. 2.2 15 km E of Seven Trees, California
  3. 1.7 7 km E of East Foothills, California
  4. 1.9 7 km WSW of Gilroy, California
  5. 2.9 7 km WSW of Gilroy, California
  6. 4.1 14 km ESE of East Foothills, California
  7. 2.0 8 km NNE of East Foothills, California
  8. 1.8 Northern California
  9. 2.5 9 km NNE of East Foothills, California
  10. 1.5 15 km E of Seven Trees, California
  11. 2.1 4 km SW of Saratoga, California
  12. 2.3 3 km N of East Foothills, California
  13. 2.6 3 km N of East Foothills, California
  14. 2.8 3 km NNE of East Foothills, California
  15. 2.0 3 km N of East Foothills, 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.