QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

11km E of Rockport, CA

· 0.9 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 42 kmHumboldt County 108 kmLake County 108 kmTrinity County 111 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 1.9 (md)
Depth
0.9 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 42 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3211 days ago

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

How big was it?

This earthquake released about 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 420,000× the energy of this one
  3. Around the size people start to feel M 3.0 38× the energy of this one
  4. This earthquake M 1.9 about 25 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 39.7548, -123.6902. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 42 km (26 mi) NNW of here earthquakes near Mendocino County
Humboldt County, CA 108 km (67 mi) S of here earthquakes near Humboldt County
Lake County, CA 108 km (67 mi) NW of here earthquakes near Lake County
Trinity County, CA 111 km (69 mi) SSW of here earthquakes near Trinity County
Glenn County, CA 112 km (69 mi) W of here earthquakes near Glenn County

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

Aftershocks so far

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

  1. 2.2 5km N of Fort Bragg, CA
  2. 1.6 7km SSW of Laytonville, CA
  3. 1.5 1km ENE of Redway, CA
  4. 2.1 13km NNE of Rockport, CA
  5. 1.6 5km NW of Laytonville, CA
  6. 1.9 13km N of Brooktrails, CA
  7. 1.8 7km ENE of Covelo, CA
  8. 1.8 28km SE of Redway, CA
  9. 1.6 20km N of Covelo, CA
  10. 2.4 4km NNW of Laytonville, CA
  11. 1.6 7km SW of Laytonville, CA
  12. 2.2 4km NNW of Laytonville, CA
  13. 2.1 4km NNW of Laytonville, CA
  14. 1.7 17km NE of Fort Bragg, CA
  15. 2.0 8km NE of Covelo, 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 4.1 on 2016-11-06 — it released about 1,500 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.