QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

7 km S of Pescadero, California

· 14 km deep · released about 200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Mateo County 25 kmSanta Cruz County 38 kmSanta Clara County 61 kmAlameda County 65 kmSan Francisco County 84 kmContra Costa County 89 kmMarin County 102 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 2.5 (md)
Depth
14 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
San Mateo County, 25 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3429 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 75,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 53,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.7× the energy of this one
  4. This earthquake M 2.5 about 200 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 37.1867, -122.3713. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Mateo County, CA 25 km (16 mi) S of here earthquakes near San Mateo County
Santa Cruz County, CA 38 km (23 mi) WNW of here earthquakes near Santa Cruz County
Santa Clara County, CA 61 km (38 mi) W of here earthquakes near Santa Clara County
Alameda County, CA 65 km (41 mi) SW of here earthquakes near Alameda County
San Francisco County, CA 84 km (52 mi) SE of here earthquakes near San Francisco County
Contra Costa County, CA 89 km (56 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

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

  1. 1.9 4km SSW of Loyola, CA
  2. 1.8 5km SSW of Loyola, CA
  3. 2.8 6km SSW of Loyola, CA
  4. 1.8 5km SSW of Loyola, CA
  5. 1.8 21km WNW of Bonny Doon, CA
  6. 1.5 4km NNW of Foster City, CA
  7. 1.9 3km WSW of Portola Valley, CA
  8. 1.8 5km SSE of Portola Valley, CA
  9. 1.5 5km S of Portola Valley, CA
  10. 1.7 5km WSW of Cupertino, CA
  11. 1.9 10km NNW of Boulder Creek, CA
  12. 1.7 7km WNW of Lexington Hills, CA
  13. 1.7 4km SW of Stanford, CA
  14. 2.1 11km SSW of Loyola, CA
  15. 2.0 8km SW of Los Altos Hills, 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.