QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

6km SSE of Riverdale, CA

· 17 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kings County 35 kmFresno County 44 kmMadera County 92 kmTulare County 95 kmSan Benito County 115 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 2.1 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Kings County, 35 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1521 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 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 36.3860, -119.8283. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kings County, CA 35 km (22 mi) N of here earthquakes near Kings County
Fresno County, CA 44 km (28 mi) SSW of here earthquakes near Fresno County
Madera County, CA 92 km (57 mi) S of here earthquakes near Madera County
Tulare County, CA 95 km (59 mi) W of here earthquakes near Tulare County
San Benito County, CA 115 km (72 mi) ESE of here earthquakes near San Benito County
Merced County, CA 120 km (75 mi) SE of here earthquakes near Merced County

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

Aftershocks so far

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

  1. 1.7 10km E of Coalinga, CA
  2. 2.7 10km E of Coalinga, CA
  3. 1.6 11km E of Coalinga, CA
  4. 2.0 11km E of Coalinga, CA
  5. 3.3 11km E of Coalinga, CA
  6. 1.9 10km E of Coalinga, CA
  7. 2.5 10km ESE of Coalinga, CA
  8. 1.6 10km NE of Coalinga, CA
  9. 2.2 8km NW of Avenal, CA
  10. 1.8 10km SW of Huron, CA
  11. 2.0 9km E of Kettleman City, CA
  12. 1.6 9km W of Huron, CA
  13. 2.5 6km S of Armona, CA
  14. 1.6 6km S of Kettleman City, CA
  15. 1.9 4km SE of Kettleman City, 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 4.0 on 2018-11-27 — it released about 760 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.