Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near Daly City, CA
No earthquake was likely felt in Daly City in the 24 hours to 9:12 pm PST (05:12 UTC). The last one was M 2.7, 9 km (6 mi) S, at 5:17 pm PDT on 28 October 2026, estimated intensity III (weak) in town; 526 felt reports to USGS. Every earthquake near Daly City
This page: a magnitude 1.7 earthquake was recorded 5 km (3 mi) southwest of Daly City, CA, at 11:27 am PDT on 28 August 2024 (18:27 UTC), 12 km deep. 2 people have reported feeling it to USGS.
USGS: 4 km W of Daly City, CA
13 km (8 mi) SW of San Francisco, CA · in Daly City, CA
- When
- 11:27 am PDT on 28 August 2024 ()
- Where
- 5 km (3 mi) southwest of Daly City, CA · earthquakes near Daly City
- Magnitude
- M 1.7 (md)
- Depth
- 12 km below the surface
- Felt
- 2 reports · strongest reported intensity II
- Nearest
- San Mateo County, 32 km SSE
- Nearest mapped fault
- San Andreas 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 799 days ago
Earthquake alerts for Daly City, CA
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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 2 km (1 mi) from the epicentre. In Daly City, 5 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: Broadmoor, Colma, Pacifica, South San Francisco, Brisbane, San Bruno.
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.
For this area
The largest earthquake within 50 km since 2016 was M 4.5 on 2019-10-15 — about 15,000 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 7.9 The 1906 San Francisco, California Earthquake · 8 km NNW of this epicentre
- 5.3 The 1957 San Francisco, California Earthquake · 3 km SE 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 37.6810, -122.5085. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Mateo County, CA | 32 km (20 mi) | SSE | earthquakes near San Mateo County |
| Marin County, CA | 46 km (29 mi) | NNW | earthquakes near Marin County |
| San Francisco County, CA | 46 km (29 mi) | W | earthquakes near San Francisco County |
| Alameda County, CA | 53 km (33 mi) | E | earthquakes near Alameda County |
| Contra Costa County, CA | 56 km (35 mi) | ENE | earthquakes near Contra Costa County |
| Solano County, CA | 82 km (51 mi) | NE | earthquakes near Solano County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
48 earthquakes have been recorded within 50 km since this one.
- 1.6 6 km NW of San Francisco Zoo, CA
- 2.9 5 km NW of San Francisco Zoo, CA
- 2.5 5 km NW of San Francisco Zoo, CA
- 2.1 5 km NW of San Francisco Zoo, CA
- 3.5 5 km NW of San Francisco Zoo, CA
- 1.7 6 km WSW of Daly City, CA
- 2.1 2 km NW of Castro Valley, CA
- 2.8 2 km NW of Castro Valley, CA
- 1.7 1 km of Pleasant Hill, CA
- 1.6 5 km E of El Granada, CA
- 1.9 1 km SW of Pacheco, CA
- 2.7 1 km SSW of Alamo, CA
- 1.6 5 km ESE of Fairview, CA
- 2.1 2 km SSW of San Ramon, CA
- 1.8 3 km W 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.