Earthquake · reviewed by a seismologist
M 1.9md
Earthquake near Greenfield, CA
No earthquake was likely felt in Greenfield in the 24 hours to 7:37 am PST (15:37 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 1.9 earthquake was recorded 44 km (28 mi) south-southwest of Greenfield, CA, at 4:57 pm PDT on 25 August 2019 (23:57 UTC), 15 km deep.
USGS: 6km SE of Lopez Point, CA
- When
- 4:57 pm PDT on 25 August 2019 ()
- Where
- 44 km (28 mi) south-southwest of Greenfield, CA · earthquakes near Greenfield
- Magnitude
- M 1.9 (md)
- Depth
- 15 km below the surface
- Felt
- no reports yet
- Nearest
- Monterey County, 33 km NNE
- Nearest mapped fault
- San Gregorio 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 2627 days ago
Earthquake alerts for Greenfield, 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 it was probably too small to be felt, even directly above it. In Greenfield, 44 km away, the estimate is intensity I (not felt). 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.
How big was it?
This earthquake released about 18 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 840,000× the energy of this one
- Magna, Utah 2020 M 5.7 600,000× the energy of this one
- Around the size people start to feel M 3.0 53× the energy of this one
- This earthquake M 1.9 about 18 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 6 earthquakes of M5 or more within 50 km; the five largest:
- 6.5 10 km NE of San Simeon, California · 49 km SE of this epicentre
- 6.2 28km NW of Cambria, CA · 33 km SSE of this epicentre
- 5.2 26km NNW of Lake Nacimiento, CA · 48 km E of this epicentre
- 5.2 25 km NW of San Simeon, California · 22 km SE of this epicentre
- 5.2 22 km NW of San Simeon, California · 25 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 35.9853, -121.5093. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Monterey County, CA | 33 km (21 mi) | NNE | earthquakes near Monterey County |
| San Benito County, CA | 79 km (49 mi) | NNE | earthquakes near San Benito County |
| San Luis Obispo County, CA | 117 km (72 mi) | SE | earthquakes near San Luis Obispo County |
| Santa Cruz County, CA | 123 km (76 mi) | NNW | earthquakes near Santa Cruz County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
45 earthquakes have been recorded within 50 km since this one.
- 1.9 13km ESE of Point Sur, CA
- 1.6 12km NE of San Simeon, CA
- 1.6 23km E of Point Sur, CA
- 2.2 31km S of Lopez Point, CA
- 2.5 33km S of Lopez Point, CA
- 1.9 31km S of Lopez Point, CA
- 2.3 19km SE of Lopez Point, CA
- 1.6 10km NNW of Lopez Point, CA
- 1.8 2km NNW of Lopez Point, CA
- 1.7 15km NE of San Simeon, CA
- 2.5 16km NNW of Lopez Point, CA
- 2.4 18km NNE of San Simeon, CA
- 1.7 6km W of San Ardo, CA
- 1.7 18km NNE of San Simeon, CA
- 2.1 14km NNW of Lopez Point, 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.