QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

20km NNE of Rockport, CA

· 6.7 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 60 kmHumboldt County 89 kmTrinity County 98 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 1.6 (md)
Depth
6.7 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 60 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2145 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 9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 9 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 39.9165, -123.7533. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 60 km (37 mi) NNW of here earthquakes near Mendocino County
Humboldt County, CA 89 km (55 mi) S of here earthquakes near Humboldt County
Trinity County, CA 98 km (61 mi) SW of here earthquakes near Trinity County
Glenn County, CA 121 km (75 mi) WNW of here earthquakes near Glenn County
Lake County, CA 125 km (78 mi) NW of here earthquakes near Lake County

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

Aftershocks so far

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

  1. 1.6 8km SSE of Laytonville, CA
  2. 1.9 26km N of Laytonville, CA
  3. 2.3 26km N of Laytonville, CA
  4. 1.6 15km SE of Laytonville, CA
  5. 1.8 3km ENE of Laytonville, CA
  6. 2.3 1km N of Redway, CA
  7. 2.1 7km ENE of Laytonville, CA
  8. 2.6 3km ENE of Laytonville, CA
  9. 2.3 4km NE of Laytonville, CA
  10. 1.6 4km ENE of Laytonville, CA
  11. 4.0 20km ENE of Redway, CA
  12. 1.5 4km ESE of Laytonville, CA
  13. 1.9 29km NE of Redway, CA
  14. 2.5 14km SE of Petrolia, CA
  15. 2.0 19km NE of Redway, 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 4.3 on 2017-12-14 — it released about 8,200 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.