Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Santa Rosa, CA
No earthquake was likely felt in Santa Rosa in the 24 hours to 2:43 pm PST (22:43 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 1.6 earthquake was recorded 47 km (29 mi) west of Santa Rosa, CA, at 6:54 pm PDT on 13 October 2023 (01:54 UTC), 3.8 km deep.
USGS: 4 km SSW of Fort Ross, CA
48 km (30 mi) W of Santa Rosa, CA · 107 km (66 mi) NW of San Francisco, CA
- When
- 6:54 pm PDT on 13 October 2023 ()
- Where
- 47 km (29 mi) west of Santa Rosa, CA · earthquakes near Santa Rosa
- Magnitude
- M 1.6 (md)
- Depth
- 3.8 km below the surface
- Felt
- no reports yet
- Nearest
- Sonoma County, 29 km E
- Nearest mapped fault
- San Andreas fault, 4 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 1125 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 11 km (7 mi) from the epicentre. In Santa Rosa, 47 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: Monte Rio, Guerneville, Bodega Bay, Camp Meeker, Occidental.
How big was it?
This earthquake released about 8.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
- Around the size people start to feel M 3.0 110× the energy of this one
- This earthquake M 1.6 about 8.4 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 4.4 on 2022-09-14 — about 14,000 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 ESE of this epicentre
- 5.3 Northern California · 41 km ESE 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 38.4790, -123.2572. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sonoma County, CA | 29 km (18 mi) | E | earthquakes near Sonoma County |
| Marin County, CA | 65 km (41 mi) | SE | earthquakes near Marin County |
| Napa County, CA | 81 km (50 mi) | E | earthquakes near Napa County |
| Lake County, CA | 83 km (51 mi) | NNE | earthquakes near Lake County |
| San Francisco County, CA | 86 km (53 mi) | SSE | earthquakes near San Francisco County |
| Mendocino County, CA | 107 km (67 mi) | N | earthquakes near Mendocino County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
1 earthquake has been recorded within 50 km since this one.
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.