Earthquake · automatic estimate, may change
M 1.7md
Earthquake near El Granada, CA
No earthquake was likely felt in El Granada in the 24 hours to 11:45 pm PST (07:45 UTC). The last one was M 2.7, 14 km (9 mi) N, at 5:17 pm PDT on 28 October 2026, estimated intensity II (weak) in town; 526 felt reports to USGS. Every earthquake near El Granada
This page: a magnitude 1.7 earthquake was recorded 3 km (2 mi) east-northeast of El Granada, CA, at 5:00 pm PDT on 1 October 2025 (00:00 UTC), 2.8 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 3 km ENE of El Granada, CA
30 km (18 mi) S of San Francisco, CA · 12 km (8 mi) WSW of San Mateo, CA
- When
- 5:00 pm PDT on 1 October 2025 ()
- Where
- 3 km (2 mi) east-northeast of El Granada, CA · earthquakes near El Granada
- Magnitude
- M 1.7 (md)
- Depth
- 2.8 km below the surface
- Felt
- no reports yet
- Nearest
- San Mateo County, 12 km SSE
- Nearest mapped fault
- San Gregorio fault, 5 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 406 days ago
Earthquake alerts for El Granada, CA
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Alerts are on for .
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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 12 km (7 mi) from the epicentre. In El Granada, 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.
Likely felt in: Half Moon Bay 5 km, intensity II · Burlingame 10 km, intensity II · Millbrae 10 km, intensity II · San Mateo 11 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 9.3 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 1,600,000× 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 3.0 100× the energy of this one
- This earthquake M 1.7 about 9.3 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 4.4 on 2018-01-04 — about 12,000 times the energy of this one.
Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:
- 7.9 The 1906 San Francisco, California Earthquake · 28 km NNW of this epicentre
- 5.8 7 km NNW of Boulder Creek, California · 44 km SE of this epicentre
- 5.3 The 1957 San Francisco, California Earthquake · 18 km NNW of this epicentre
- 5.1 7 km SW of Monte Sereno, California · 49 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 37.5125, -122.4340. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Mateo County, CA | 12 km (8 mi) | SSE | earthquakes near San Mateo County |
| Alameda County, CA | 48 km (30 mi) | ENE | earthquakes near Alameda County |
| San Francisco County, CA | 58 km (36 mi) | WNW | earthquakes near San Francisco County |
| Contra Costa County, CA | 62 km (39 mi) | NE | earthquakes near Contra Costa County |
| Marin County, CA | 66 km (41 mi) | NNW | earthquakes near Marin County |
| Santa Cruz County, CA | 67 km (42 mi) | SE | earthquakes near Santa Cruz County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
34 earthquakes have been recorded within 50 km since this one.
- 1.8 3 km SE of Pacifica, CA
- 1.6 5 km SE of Oakland, CA
- 2.4 5 km SE of Oakland, CA
- 2.0 3 km S of Sunol, CA
- 2.1 3 km ENE of Stinson Beach, CA
- 2.4 1 km E of Woodside, CA
- 1.6 1 km ESE of Woodside, CA
- 2.6 1 km ESE of Woodside, CA
- 2.2 1 km E of Woodside, CA
- 2.0 1 km ENE of Woodside, CA
- 2.5 1 km E of Woodside, CA
- 2.2 1 km E of Woodside, CA
- 2.0 1 km E of Woodside, CA
- 2.2 2 km E of Berkeley, CA
- 1.6 8 km NW of San Francisco Zoo, 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.