Earthquake · reviewed by a seismologist
M 2.5md
Earthquake near Greenfield, CA
No earthquake was likely felt in Greenfield in the 24 hours to 4:58 am PST (12:58 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 2.5 earthquake was recorded 27 km (17 mi) east-northeast of Greenfield, CA, at 10:18 am PDT on 18 October 2019 (17:18 UTC), 6.7 km deep. 3 people have reported feeling it to USGS.
USGS: 24km SE of Pinnacles, CA
- When
- 10:18 am PDT on 18 October 2019 ()
- Where
- 27 km (17 mi) east-northeast of Greenfield, CA · earthquakes near Greenfield
- Magnitude
- M 2.5 (md)
- Depth
- 6.7 km below the surface
- Felt
- 3 reports · strongest reported intensity IV
- Nearest
- San Benito County, 28 km NNW
- Nearest mapped fault
- San Andreas fault, 3 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 2571 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 21 km (13 mi) from the epicentre. In Greenfield, 27 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: King City.
How big was it?
This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 83,000× the energy of this one
- Magna, Utah 2020 M 5.7 59,000× the energy of this one
- Around the size people start to feel M 3.0 5.2× the energy of this one
- This earthquake M 2.5 about 180 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 1,900 times the energy of this one.
Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:
- 6.1 Northwest of Huron, California · 34 km ENE of this epicentre
- 5.9 10 km SE of Tres Pinos, California · 46 km NNW of this epicentre
- 5.8 Near Paicines, California · 41 km NW of this epicentre
- 5.8 29 km NE of San Lucas, California · 19 km ESE of this epicentre
- 5.5 12 km S of Tres Pinos, California · 45 km NW 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 36.3840, -120.9537. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Benito County, CA | 28 km (17 mi) | NNW | earthquakes near San Benito County |
| Monterey County, CA | 36 km (22 mi) | WSW | earthquakes near Monterey County |
| Merced County, CA | 92 km (57 mi) | NNE | earthquakes near Merced County |
| Kings County, CA | 108 km (67 mi) | ESE | earthquakes near Kings County |
| Santa Clara County, CA | 114 km (71 mi) | NW | earthquakes near Santa Clara County |
| Santa Cruz County, CA | 117 km (73 mi) | NW | earthquakes near Santa Cruz 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 2km ENE of New Idria, CA
- 2.4 7km ESE of Pinnacles, CA
- 2.0 3km NE of New Idria, CA
- 1.7 3km NE of New Idria, CA
- 2.3 3km NE of New Idria, CA
- 1.9 3km ENE of New Idria, CA
- 3.1 4km NE of New Idria, CA
- 1.6 18km E of Pinnacles, CA
- 1.5 11km NW of Pinnacles, CA
- 1.9 14km SSE of Tres Pinos, CA
- 1.7 14km SSE of Tres Pinos, CA
- 2.1 14km S of Tres Pinos, CA
- 2.2 16km SSE of Tres Pinos, CA
- 1.6 6km NE of Pinnacles, CA
- 1.6 14km SSE of Tres Pinos, 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.