Earthquake · reviewed by a seismologist
M 1.7md
22km W of Bonny Doon, CA
- When
- Magnitude
- M 1.7 (md)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Santa Cruz County, 35 km E
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1661 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 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 95× the energy of this one
- This earthquake M 1.7 about 10 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 37.0543, -122.3953. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Santa Cruz County, CA | 35 km (22 mi) | W of here | earthquakes near Santa Cruz County |
| San Mateo County, CA | 40 km (25 mi) | S of here | earthquakes near San Mateo County |
| Santa Clara County, CA | 65 km (41 mi) | WSW of here | earthquakes near Santa Clara County |
| Alameda County, CA | 79 km (49 mi) | SSW of here | earthquakes near Alameda County |
| San Francisco County, CA | 94 km (58 mi) | SE of here | earthquakes near San Francisco County |
| Contra Costa County, CA | 104 km (65 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
55 earthquakes have been recorded within 50 km since this one.
- 2.0 2km SE of Portola Valley, CA
- 1.9 7km SSE of Portola Valley, CA
- 2.1 7km SSE of Portola Valley, CA
- 1.9 5km NNW of Day Valley, CA
- 1.7 4km SW of Felton, CA
- 1.8 4km SSE of Highlands-Baywood Park, CA
- 1.6 1km SSE of Portola Valley, CA
- 1.9 6km SSE of Portola Valley, CA
- 1.7 1km SE of Portola Valley, CA
- 1.6 1km SE of Portola Valley, CA
- 2.3 1km ESE of Portola Valley, CA
- 2.0 1km SE of Portola Valley, CA
- 2.2 5km S of Loyola, CA
- 2.4 1km SE of Portola Valley, CA
- 2.1 1km SE of Portola Valley, 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
- 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.