QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

Earthquake near Woodland, CA

USGS: 11 km NNW of Guinda, California

77 km (48 mi) WNW of Sacramento, CA · 50 km (31 mi) NW of Woodland, CA

7:39 pm PDT, Aug 12, 2016 · · -0.5 km deep · released about 5.4 lb of TNT

Every earthquake near Woodland Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Colusa County 28 kmYolo County 40 kmSutter County 47 kmNapa County 48 kmLake County 49 kmSonoma County 75 kmGlenn County 76 kmSolano County 78 kmYuba County 85 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
7:39 pm PDT on 12 August 2016 ()
Where
48 km (30 mi) NW of Woodland, CA · earthquakes near Woodland
Magnitude
M 1.5 (md)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Colusa County, 28 km N
Nearest mapped fault
Great Valley thrust fault system, 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 3521 days ago

A magnitude 1.5 earthquake was recorded 48 km (30 mi) NW of Woodland, CA, at 7:39 pm PDT on 12 August 2016 (02:39 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Arbuckle, Dunnigan, Williams.

How big was it?

This earthquake released about 5.4 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 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 38.9290, -122.2292. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Colusa County, CA 28 km (17 mi) N earthquakes near Colusa County
Yolo County, CA 40 km (25 mi) SE earthquakes near Yolo County
Sutter County, CA 47 km (29 mi) ENE earthquakes near Sutter County
Napa County, CA 48 km (30 mi) S earthquakes near Napa County
Lake County, CA 49 km (30 mi) WNW earthquakes near Lake County
Sonoma County, CA 75 km (47 mi) SW earthquakes near Sonoma County

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

Aftershocks so far

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

  1. 1.7 7 km E of Clearlake Oaks, California
  2. 1.6 7 km E of Clearlake Oaks, California
  3. 2.5 8 km NNE of Clearlake, California
  4. 1.7 7 km W of Middletown, California
  5. 1.7 Northern California
  6. 1.7 4 km SSW of Cobb, California
  7. 1.8 2 km WNW of Cobb, California
  8. 2.4 7 km S of Cobb, California
  9. 1.7 2 km SSW of Cobb, California
  10. 1.7 5 km SW of Cobb, California
  11. 1.9 6 km S of Cobb, CA
  12. 1.9 4 km WNW of Cobb, California
  13. 1.5 4 km SSW of Cobb, California
  14. 2.0 7 km W of Middletown, California
  15. 1.6 4 km WSW of Cobb, California

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

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