Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near Calistoga, CA
No earthquake was likely felt in Calistoga in the 24 hours to 1:21 pm PST (21:21 UTC). The last one was M 3.0, 33 km (21 mi) NW, at 11:06 pm PDT on 14 October 2026, estimated intensity II (weak) in town; 1 felt report to USGS. Every earthquake near Calistoga
This page: a magnitude 1.7 earthquake was recorded 6 km (4 mi) southwest of Calistoga, CA, at 4:55 am PDT on 9 May 2021 (11:55 UTC), 8.3 km deep.
USGS: 6km SW of Calistoga, CA
12 km (8 mi) NE of Santa Rosa, CA
- When
- 4:55 am PDT on 9 May 2021 ()
- Where
- 6 km (4 mi) southwest of Calistoga, CA · earthquakes near Calistoga
- Magnitude
- M 1.7 (md)
- Depth
- 8.3 km below the surface
- Felt
- no reports yet
- Nearest
- Napa County, 26 km E
- Nearest mapped fault
- Maacama 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 2011 days ago
Earthquake alerts for Calistoga, CA
Get a notification in this browser when USGS records an earthquake near Calistoga, 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 Calistoga, 6 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: Calistoga 6 km, intensity II. Estimated for each town centre; each link is that town's own record.
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 5.0 on 2016-12-14 — about 99,000 times the energy of this one.
Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:
- 6.0 The 2014 South Napa, California Earthquake · 45 km SE of this epicentre
- 5.3 3 km E of Bloomfield, California · 29 km SSW of this epicentre
- 5.3 Northern California · 30 km SW 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 38.5350, -122.6228. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Napa County, CA | 26 km (16 mi) | E | earthquakes near Napa County |
| Sonoma County, CA | 26 km (16 mi) | W | earthquakes near Sonoma County |
| Marin County, CA | 55 km (34 mi) | SSW | earthquakes near Marin County |
| Lake County, CA | 65 km (40 mi) | N | earthquakes near Lake County |
| Yolo County, CA | 65 km (40 mi) | ENE | earthquakes near Yolo County |
| Solano County, CA | 67 km (41 mi) | ESE | earthquakes near Solano County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
58 earthquakes have been recorded within 50 km since this one.
- 1.5 6km NW of The Geysers, CA
- 1.6 12km ENE of Cloverdale, CA
- 1.7 6km NW of The Geysers, CA
- 2.1 6km WNW of The Geysers, CA
- 1.6 2km NW of The Geysers, CA
- 1.7 3km N of The Geysers, CA
- 1.7 3km W of Cobb, CA
- 1.9 3km NW of The Geysers, CA
- 2.0 7km NW of The Geysers, CA
- 2.0 7km NW of The Geysers, CA
- 1.5 9km NE of Hidden Valley Lake, CA
- 1.8 9km NE of Hidden Valley Lake, CA
- 1.6 6km NNW of The Geysers, CA
- 1.7 9km NNE of Yountville, CA
- 1.8 7km W of Cobb, 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.