Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near Boonville, CA
No earthquake was likely felt in Boonville in the 24 hours to 6:12 pm PST (02:12 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 1.7 earthquake was recorded 15 km (9 mi) southeast of Boonville, CA, at 8:48 am PDT on 18 June 2018 (15:48 UTC), 8.8 km deep.
USGS: 15km SE of Boonville, CA
- When
- 8:48 am PDT on 18 June 2018 ()
- Where
- 15 km (9 mi) southeast of Boonville, CA · earthquakes near Boonville
- Magnitude
- M 1.7 (md)
- Depth
- 8.8 km below the surface
- Felt
- no reports yet
- Nearest
- Lake County, 48 km ENE
- Nearest mapped fault
- Maacama fault, 16 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 3067 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 9 km (6 mi) from the epicentre. In Boonville, 15 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.
Earthquakes near other towns within 30 km: Cloverdale, Talmage, Ukiah, Sea Ranch.
How big was it?
This earthquake released about 12 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 1,300,000× the energy of this one
- Magna, Utah 2020 M 5.7 900,000× the energy of this one
- Around the size people start to feel M 3.0 80× the energy of this one
- This earthquake M 1.7 about 12 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 83,000 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 · 26 km NNE 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 38.9130, -123.2400. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake County, CA | 48 km (30 mi) | ENE | earthquakes near Lake County |
| Sonoma County, CA | 51 km (32 mi) | SSE | earthquakes near Sonoma County |
| Mendocino County, CA | 60 km (37 mi) | NNW | earthquakes near Mendocino County |
| Napa County, CA | 91 km (57 mi) | ESE | earthquakes near Napa County |
| Colusa County, CA | 91 km (57 mi) | ENE | earthquakes near Colusa County |
| Marin County, CA | 105 km (65 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.
- 1.6 1km NNW of The Geysers, CA
- 1.8 5km NW of Cobb, CA
- 1.6 13km NW of The Geysers, CA
- 1.6 6km NW of The Geysers, CA
- 1.7 7km NW of The Geysers, CA
- 1.7 3km SW of Anderson Springs, CA
- 1.7 6km WNW of Cobb, CA
- 1.6 7km NW of The Geysers, CA
- 2.0 7km NW of The Geysers, CA
- 1.6 8km NW of The Geysers, CA
- 1.7 19km NNW of Cloverdale, CA
- 1.8 4km NNW of Redwood Valley, CA
- 1.6 15km SE of Boonville, CA
- 2.4 16km SE of Boonville, CA
- 1.9 6km 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.