QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

9km S of Boonville, CA

· -0.1 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 56 kmLake County 58 kmSonoma County 60 kmColusa County 102 kmNapa County 102 kmMarin County 112 kmGlenn County 112 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 1.5 (md)
Depth
-0.1 km below the surface
Felt
1 report
Nearest
Mendocino County, 56 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1733 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 5.7 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.

  1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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.

Where

Epicentre 38.9303, -123.3745. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 56 km (35 mi) S of here earthquakes near Mendocino County
Lake County, CA 58 km (36 mi) WSW of here earthquakes near Lake County
Sonoma County, CA 60 km (37 mi) NW of here earthquakes near Sonoma County
Colusa County, CA 102 km (63 mi) WSW of here earthquakes near Colusa County
Napa County, CA 102 km (64 mi) WNW of here earthquakes near Napa County
Marin County, CA 112 km (70 mi) NNW of here earthquakes near Marin County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

54 earthquakes have been recorded within 50 km since this one.

  1. 1.5 12km NNW of Healdsburg, CA
  2. 1.6 3km E of Redwood Valley, CA
  3. 1.8 12km ENE of Navarro Head, CA
  4. 1.5 7km NW of The Geysers, CA
  5. 2.2 14km WSW of Willits, CA
  6. 2.4 13km WSW of Willits, CA
  7. 1.7 7km WNW of The Geysers, CA
  8. 1.8 7km WNW of The Geysers, CA
  9. 1.8 9km NNW of Redwood Valley, CA
  10. 1.7 9km SE of Willits, CA
  11. 1.6 9km SE of Willits, CA
  12. 2.0 12km WNW of Lakeport, CA
  13. 1.8 4km SSE of Redwood Valley, CA
  14. 1.7 10km WNW of The Geysers, CA
  15. 2.0 18km SW of Willits, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2016-12-14 — it released about 170,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.