Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Greenfield, CA
No earthquake was likely felt in Greenfield in the 24 hours to 9:51 am PST (17:51 UTC). The last one was M 3.0, 38 km (23 mi) N, at 2:58 pm PDT on 22 October 2026, estimated intensity II (weak) in town. Every earthquake near Greenfield
This page: a magnitude 1.5 earthquake was recorded 7 km (4 mi) north of Greenfield, CA, at 1:24 pm PDT on 31 July 2025 (20:24 UTC), 4.2 km deep. 1 person has reported feeling it to USGS.
USGS: 7 km NNE of Greenfield, CA
50 km (31 mi) SE of Salinas, CA · 114 km (71 mi) SSE of San Jose, CA
- When
- 1:24 pm PDT on 31 July 2025 ()
- Where
- 7 km (4 mi) north of Greenfield, CA · earthquakes near Greenfield
- Magnitude
- M 1.5 (md)
- Depth
- 4.2 km below the surface
- Felt
- 1 report
- Nearest
- Monterey County, 17 km SSW
- Nearest mapped fault
- San Andreas fault, 18 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 464 days ago
Earthquake alerts for Greenfield, CA
Get a notification in this browser when USGS records an earthquake near Greenfield, 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 9 km (6 mi) from the epicentre. In Greenfield, 7 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: Greenfield 7 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 5.4 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 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 4.7 on 2019-10-15 — about 65,000 times the energy of this one.
Before 2016, the USGS record lists 16 earthquakes of M5 or more within 50 km; the five largest:
- 5.9 10 km SE of Tres Pinos, California · 39 km N of this epicentre
- 5.8 Near Paicines, California · 32 km N of this epicentre
- 5.8 29 km NE of San Lucas, California · 42 km ESE of this epicentre
- 5.5 12 km S of Tres Pinos, California · 34 km N of this epicentre
- 5.5 3 km ENE of Tres Pinos, California · 47 km N 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 36.3803, -121.2317. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Monterey County, CA | 17 km (11 mi) | SSW | earthquakes near Monterey County |
| San Benito County, CA | 29 km (18 mi) | NNE | earthquakes near San Benito County |
| Santa Cruz County, CA | 99 km (61 mi) | NW | earthquakes near Santa Cruz County |
| Merced County, CA | 101 km (63 mi) | NNE | earthquakes near Merced County |
| Santa Clara County, CA | 102 km (63 mi) | NNW | earthquakes near Santa Clara County |
| San Luis Obispo County, CA | 131 km (81 mi) | SSE | earthquakes near San Luis Obispo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.7 3 km E of Pinnacles, CA
- 2.3 11 km SSW of Tres Pinos, CA
- 2.2 4 km ENE of Pinnacles, CA
- 1.9 4 km E of Pinnacles, CA
- 2.3 5 km ENE of Pinnacles, CA
- 1.6 2 km NNE of Pinnacles, CA
- 2.1 10 km SE of Pinnacles, CA
- 1.9 7 km SSW of Tres Pinos, CA
- 1.9 22 km ENE of King City, CA
- 1.6 7 km NNW of Pinnacles, CA
- 2.7 2 km WNW of Pinnacles, CA
- 1.7 14 km S of Tres Pinos, CA
- 2.8 7 km NNW of Pinnacles, CA
- 2.4 13 km SSW of Tres Pinos, CA
- 3.1 2 km E of Pinnacles, 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.