Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Broadmoor, CA
Yes: an earthquake was likely felt in Broadmoor in the last 24 hours. M 1.6, 5 km (3 mi) SSW of Broadmoor, at 12:47 am PST on 13 November 2026 (08:47 UTC); the estimated shaking in Broadmoor was intensity II (weak). Every earthquake near Broadmoor
This page: a magnitude 1.5 earthquake was recorded 3 km (2 mi) south-southwest of Broadmoor, CA, at 1:14 pm PDT on 9 April 2017 (20:14 UTC), 9.5 km deep.
USGS: 2 km SSW of Broadmoor, California
15 km (9 mi) SSW of San Francisco, CA · 5 km (3 mi) SW of Daly City, CA
- When
- 1:14 pm PDT on 9 April 2017 ()
- Where
- 3 km (2 mi) south-southwest of Broadmoor, CA · earthquakes near Broadmoor
- Magnitude
- M 1.5 (md)
- Depth
- 9.5 km below the surface
- Felt
- no reports yet
- Nearest
- San Mateo County, 30 km SSE
- Nearest mapped fault
- San Andreas fault, 2 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 3504 days ago
Earthquake alerts for Broadmoor, CA
Get a notification in this browser when USGS records an earthquake near Broadmoor, CA. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 4 km (2 mi) from the epicentre. In Broadmoor, 3 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: Colma, Daly City, Pacifica, South San Francisco, San Bruno, Brisbane.
How big was it?
This earthquake released about 5.6 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.
- Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.6 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 2 earthquakes of M5 or more within 50 km:
- 7.9 The 1906 San Francisco, California Earthquake · 10 km NNW of this epicentre
- 5.3 The 1957 San Francisco, California Earthquake · 1 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 37.6650, -122.4997. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Mateo County, CA | 30 km (19 mi) | SSE | earthquakes near San Mateo County |
| San Francisco County, CA | 47 km (29 mi) | W | earthquakes near San Francisco County |
| Marin County, CA | 48 km (30 mi) | NNW | earthquakes near Marin County |
| Alameda County, CA | 52 km (32 mi) | E | earthquakes near Alameda County |
| Contra Costa County, CA | 56 km (35 mi) | ENE | earthquakes near Contra Costa County |
| Solano County, CA | 83 km (52 mi) | NE | earthquakes near Solano County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
40 earthquakes have been recorded within 50 km since this one.
- 2.2 7 km S of Muir Beach, California
- 2.9 7 km SSW of Muir Beach, California
- 1.9 0 km NNW of Pleasant Hill, California
- 2.0 0 km W of Kensington, California
- 1.7 0 km W of Kensington, California
- 1.8 0 km E of Hayward, California
- 2.0 4 km NNW of Orinda, California
- 2.0 4 km NNW of Orinda, California
- 1.6 4 km SW of Danville, California
- 2.1 2 km SSW of San Ramon, California
- 2.2 1 km SSW of San Ramon, California
- 2.7 7 km S of Muir Beach, California
- 1.8 0 km NNW of Ladera, California
- 1.6 1 km N of Ladera, California
- 2.0 1 km W of Danville, 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
- 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.