QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

Earthquake near Bonny Doon, CA

No earthquake was likely felt in Bonny Doon in the 24 hours to 10:15 pm PST (06:15 UTC). The last one was M 3.8, 79 km (49 mi) N, at 8:30 am PDT on 13 August 2026, estimated intensity II (weak) in town; 7,876 felt reports to USGS. Every earthquake near Bonny Doon

This page: a magnitude 1.9 earthquake was recorded 14 km (9 mi) south-southwest of Bonny Doon, CA, at 10:38 pm PST on 22 December 2024 (06:38 UTC), 7.3 km deep.

USGS: 14 km SSW of Bonny Doon, CA

15 km (9 mi) WSW of Santa Cruz, CA · 54 km (33 mi) SW of San Jose, CA

10:38 pm PST, Dec 22, 2024 · · 7.3 km deep · released about 21 lb of TNT

Every earthquake near Bonny Doon Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Cruz County 19 kmSanta Clara County 56 kmSan Mateo County 57 kmAlameda County 85 kmSan Benito County 104 kmMonterey County 108 kmContra Costa County 113 kmSan Francisco County 117 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
10:38 pm PST on 22 December 2024 ()
Where
14 km (9 mi) south-southwest of Bonny Doon, CA · earthquakes near Bonny Doon
Magnitude
M 1.9 (md)
Depth
7.3 km below the surface
Felt
no reports yet
Nearest
Santa Cruz County, 19 km ENE
Nearest mapped fault
San Gregorio fault, under 1 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 677 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 13 km (8 mi) from the epicentre. In Bonny Doon, 14 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Santa Cruz, Pasatiempo, Twin Lakes, Felton, Mount Hermon, Live Oak.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× the energy of this one
  4. This earthquake M 1.9 about 21 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.2 on 2024-09-29 — about 2,500 times the energy of this one.

Before 2016, the USGS record lists 19 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.9 The 1989 Loma Prieta, California Earthquake · 30 km ENE of this epicentre
  2. 6.3 22 km S of Davenport, California · 12 km S of this epicentre
  3. 6.3 16 km SW of Davenport, California · 14 km W of this epicentre
  4. 6.1 Near San Jose, California · 47 km NE of this epicentre
  5. 5.8 Near Watsonville, California · 44 km E of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 36.9185, -122.1888. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Santa Cruz County, CA 19 km (12 mi) ENE earthquakes near Santa Cruz County
Santa Clara County, CA 56 km (35 mi) NE earthquakes near Santa Clara County
San Mateo County, CA 57 km (36 mi) NNW earthquakes near San Mateo County
Alameda County, CA 85 km (53 mi) NNE earthquakes near Alameda County
San Benito County, CA 104 km (65 mi) ESE earthquakes near San Benito County
Monterey County, CA 108 km (67 mi) SE earthquakes near Monterey County

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

Aftershocks so far

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

  1. 2.2 3 km NE of Day Valley, CA
  2. 3.1 31 km SW of Portola Valley, CA
  3. 1.6 4 km SW of Loyola, CA
  4. 2.6 5 km WSW of Loyola, CA
  5. 3.0 5 km WSW of Loyola, CA
  6. 2.5 5 km SW of Loyola, CA
  7. 1.7 14 km WSW of Portola Valley, CA
  8. 1.6 11 km of Boulder Creek, CA
  9. 2.4 8 km NNE of Interlaken, CA
  10. 1.8 6 km SSE of Portola Valley, CA
  11. 1.7 6 km SW of Los Altos Hills, CA
  12. 1.6 5 km SE of Interlaken, CA
  13. 1.6 4 km ESE of Interlaken, CA
  14. 1.7 17 km NW of Pacific Grove, CA
  15. 2.3 17 km SW of Santa Cruz, 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.