Earthquake · automatic estimate, may change
M 1.5md
Earthquake near Santa Rosa, CA
No earthquake was likely felt in Santa Rosa in the 24 hours to 10:42 am PST (18:42 UTC). The last one was M 1.9, 5 km (3 mi) NE, at 2:01 pm PDT on 23 October 2026, estimated intensity II (weak) in town. Every earthquake near Santa Rosa
This page: a magnitude 1.5 earthquake was recorded 29 km (18 mi) north of Santa Rosa, CA, at 12:55 am PDT on 16 August 2024 (07:55 UTC), 4.9 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 8 km SSW of The Geysers, CA
29 km (18 mi) N of Santa Rosa, CA · 107 km (66 mi) NNW of San Francisco, CA
- When
- 12:55 am PDT on 16 August 2024 ()
- Where
- 29 km (18 mi) north of Santa Rosa, CA · earthquakes near Santa Rosa
- Magnitude
- M 1.5 (md)
- Depth
- 4.9 km below the surface
- Felt
- no reports yet
- Nearest
- Sonoma County, 24 km SW
- Nearest mapped fault
- Maacama fault, 4 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 818 days ago
Earthquake alerts for Santa Rosa, 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, people at rest would likely notice it out to about 9 km (6 mi) from the epicentre. In Santa Rosa, 29 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.
Earthquakes near other towns within 30 km: Healdsburg, Cobb, Middletown, Windsor, Larkfield-Wikiup, Calistoga.
How big was it?
This earthquake released about 5.6 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 2,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.6 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 180,000 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.3 3 km E of Bloomfield, California · 43 km S of this epicentre
- 5.3 Northern California · 43 km S 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 38.7015, -122.7683. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sonoma County, CA | 24 km (15 mi) | SW | earthquakes near Sonoma County |
| Napa County, CA | 44 km (27 mi) | ESE | earthquakes near Napa County |
| Lake County, CA | 45 km (28 mi) | N | earthquakes near Lake County |
| Colusa County, CA | 70 km (44 mi) | NE | earthquakes near Colusa County |
| Marin County, CA | 72 km (45 mi) | S | earthquakes near Marin County |
| Yolo County, CA | 75 km (47 mi) | E | earthquakes near Yolo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
60 earthquakes have been recorded within 50 km since this one.
- 2.0 14 km SE of Boonville, CA
- 1.5 3 km S of Cobb, CA
- 2.2 15 km SE of Boonville, CA
- 1.5 7 km NNW of The Geysers, CA
- 1.7 7 km NNW of The Geysers, CA
- 1.5 3 km WNW of Cobb, CA
- 2.5 3 km WNW of Cobb, CA
- 3.1 3 km ENE of The Geysers, CA
- 4.3 1 km ESE of The Geysers, CA
- 1.8 6 km NNW of The Geysers, CA
- 1.6 12 km E of Cloverdale, CA
- 1.9 9 km NW of The Geysers, CA
- 1.6 8 km NNW of The Geysers, CA
- 1.8 1 km NE of The Geysers, CA
- 2.0 6 km WNW 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.