QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Stockton, CA

Yes. A magnitude 1.8 earthquake was recorded 12 km (7 mi) SW of Stockton, CA, at 6:45 am PDT on 2 October 2016 (13:45 UTC), 15 km deep.

This was on 2 October 2016. The latest near Stockton: M 2.9 on 29 February 2024.

USGS: 9 km WSW of Taft Mosswood, California

13 km (8 mi) SSW of Stockton, CA

6:45 am PDT, Oct 2, 2016 · · 15 km deep · released about 15 lb of TNT

Every earthquake near Stockton Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Joaquin County 11 kmStanislaus County 48 kmContra Costa County 50 kmAlameda County 53 kmSacramento County 64 kmSolano County 65 kmSanta Clara County 78 kmCalaveras County 80 kmAmador County 89 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
6:45 am PDT on 2 October 2016 ()
Where
12 km (7 mi) SW of Stockton, CA · earthquakes near Stockton
Magnitude
M 1.8 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
San Joaquin County, 11 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3531 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Stockton, 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.

Earthquakes near other towns within 30 km: French Camp, Lathrop, Kennedy, August, Tracy, Garden Acres.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 lists 3 earthquakes of M5 or more within 50 km:

  1. 5.8 The 1980 Livermore, California Earthquake · 34 km W of this epicentre
  2. 5.4 9 km NE of Livermore, California · 32 km WSW of this epicentre
  3. 5.1 11 km E of Blackhawk, California · 36 km WSW 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 37.8775, -121.3790. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Joaquin County, CA 11 km (7 mi) NE earthquakes near San Joaquin County
Stanislaus County, CA 48 km (30 mi) SE earthquakes near Stanislaus County
Contra Costa County, CA 50 km (31 mi) W earthquakes near Contra Costa County
Alameda County, CA 53 km (33 mi) WSW earthquakes near Alameda County
Sacramento County, CA 64 km (40 mi) N earthquakes near Sacramento County
Solano County, CA 65 km (41 mi) NW earthquakes near Solano County

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

Aftershocks so far

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

  1. 2.2 5 km S of Livermore, California
  2. 1.7 3 km W of Byron, California
  3. 1.6 4 km SSW of Byron, California
  4. 1.8 4 km ENE of Clayton, California
  5. 2.1 2 km SSE of Livermore, California
  6. 1.8 8 km SE of Livermore, California
  7. 2.1 1 km SSE of Livermore, California
  8. 2.6 2 km SSE of Livermore, California
  9. 1.9 1 km SSE of Livermore, California
  10. 1.8 2 km SSE of Livermore, California
  11. 1.6 1 km SSE of Livermore, California
  12. 1.6 1 km SSE of Livermore, California
  13. 1.6 1 km SSW of Livermore, California
  14. 2.7 2 km SSE of Livermore, California
  15. 2.1 2 km SSE of Livermore, 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.