Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near Boonville, CA
No earthquake was likely felt in Boonville in the 24 hours to 3:05 am PST (11:05 UTC). The last one was M 4.0, 65 km (41 mi) NNE, at 5:01 am PDT on 28 October 2026, estimated intensity II (weak) in town; 14 felt reports to USGS. Every earthquake near Boonville
This page: a magnitude 2.1 earthquake was recorded 12 km (7 mi) south of Boonville, CA, at 10:55 pm PDT on 5 April 2020 (05:55 UTC), 3.1 km deep.
USGS: 12km S of Boonville, CA
77 km (48 mi) NW of Santa Rosa, CA
- When
- 10:55 pm PDT on 5 April 2020 ()
- Where
- 12 km (7 mi) south of Boonville, CA · earthquakes near Boonville
- Magnitude
- M 2.1 (md)
- Depth
- 3.1 km below the surface
- Felt
- no reports yet
- Nearest
- Sonoma County, 57 km SE
- Nearest mapped fault
- San Andreas fault, 18 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 2410 days ago
Earthquake alerts for Boonville, CA
Get a notification in this browser when USGS records an earthquake near Boonville, 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 18 km (11 mi) from the epicentre. In Boonville, 12 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: Boonville 12 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 51 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 300,000× the energy of this one
- Magna, Utah 2020 M 5.7 210,000× the energy of this one
- Around the size people start to feel M 3.0 19× the energy of this one
- This earthquake M 2.1 about 51 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 19,000 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.2 6 km ESE of Talmage, California · 33 km NE 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 38.9043, -123.3715. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Sonoma County, CA | 57 km (36 mi) | SE | earthquakes near Sonoma County |
| Lake County, CA | 59 km (36 mi) | ENE | earthquakes near Lake County |
| Mendocino County, CA | 59 km (37 mi) | N | earthquakes near Mendocino County |
| Napa County, CA | 101 km (63 mi) | ESE | earthquakes near Napa County |
| Colusa County, CA | 103 km (64 mi) | ENE | earthquakes near Colusa County |
| Marin County, CA | 109 km (68 mi) | SSE | earthquakes near Marin 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.
- 1.9 15km WSW of Lakeport, CA
- 1.8 12km SE of Talmage, CA
- 1.7 9km NNW of Redwood Valley, CA
- 2.3 8km NNW of Redwood Valley, CA
- 1.5 9km NNW of Healdsburg, CA
- 1.8 12km WNW of Redwood Valley, CA
- 2.6 6km ESE of Redwood Valley, CA
- 1.8 20km SW of Willits, CA
- 2.2 20km SW of Willits, CA
- 2.3 13km W of Lakeport, CA
- 1.9 7km NW of The Geysers, CA
- 2.1 15km SW of Lakeport, CA
- 1.6 7km NW of The Geysers, CA
- 1.6 9km WNW of The Geysers, CA
- 1.7 12km NE of Talmage, 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.