Earthquake near Bonny Doon, CA

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 17 km (11 mi) from the epicentre. In Bonny Doon, 19 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: Boulder Creek, Brookdale, Ben Lomond, Felton, Mount Hermon, Lompico.

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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:

1. 6.9 The 1989 Loma Prieta, California Earthquake · 43 km E of this epicentre Oct 18, 1989
2. 6.3 22 km S of Davenport, California · 34 km SSE of this epicentre Oct 22, 1926
3. 6.3 16 km SW of Davenport, California · 18 km S of this epicentre Oct 22, 1926
4. 5.8 7 km NNW of Boulder Creek, California · 22 km ENE of this epicentre Sep 5, 1955
5. 5.7 Monterey Bay area, California · 39 km SE of this epicentre Dec 31, 1910

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 37.0885, -122.3552. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.2 12km WSW of Saratoga, CA 20:41 UTC
2. 1.9 3km S of Los Altos Hills, CA 08:21 UTC
3. 2.2 2km S of Los Altos Hills, CA 09:01 UTC
4. 1.7 3km S of Los Altos Hills, CA 06:16 UTC
5. 2.1 2km SSW of Los Altos Hills, CA 16:48 UTC
6. 2.8 3km S of Los Altos Hills, CA 04:26 UTC
7. 1.8 2km S of Los Altos Hills, CA 19:21 UTC
8. 1.7 7km N of Day Valley, CA 08:15 UTC
9. 1.6 3km ESE of Highlands-Baywood Park, CA 20:16 UTC
10. 1.6 15km S of Half Moon Bay, CA 01:12 UTC
11. 1.8 8km SSW of Loyola, CA 16:11 UTC
12. 2.7 7km N of Boulder Creek, CA 16:36 UTC
13. 2.2 2km SW of Lexington Hills, CA 19:05 UTC
14. 1.5 18km W of Boulder Creek, CA 05:37 UTC
15. 1.7 14km SW of Santa Cruz, CA 07:06 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 07:01 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

• The official USGS event page — the source of record for every value above
• Did you feel it? Report it to USGS — reports go to USGS, not to us
• ShakeMap for this event, when USGS has produced one

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