QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

5km NNW of Day Valley, CA

· 9.3 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Cruz County 13 kmSanta Clara County 24 kmSan Mateo County 57 kmAlameda County 63 kmSan Benito County 88 kmContra Costa County 94 kmStanislaus County 95 kmMerced County 104 kmMonterey County 106 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
9.3 km below the surface
Felt
no reports yet
Nearest
Santa Cruz County, 13 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1205 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 37.0778, -121.8872. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Cruz County, CA 13 km (8 mi) NE of here earthquakes near Santa Cruz County
Santa Clara County, CA 24 km (15 mi) SW of here earthquakes near Santa Clara County
San Mateo County, CA 57 km (35 mi) SE of here earthquakes near San Mateo County
Alameda County, CA 63 km (39 mi) S of here earthquakes near Alameda County
San Benito County, CA 88 km (55 mi) NW of here earthquakes near San Benito County
Contra Costa County, CA 94 km (58 mi) S of here earthquakes near Contra Costa County

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

Aftershocks so far

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

  1. 2.6 8 km NE of Gilroy, CA
  2. 2.1 4 km WSW of San Juan Bautista, CA
  3. 2.7 3 km ESE of Aromas, CA
  4. 1.6 4 km NNW of Aromas, CA
  5. 1.6 7 km SSE of Portola Valley, CA
  6. 1.7 12 km NNE of Alum Rock, CA
  7. 1.6 18 km SSW of Santa Cruz, CA
  8. 2.3 3 km ESE of Aromas, CA
  9. 1.6 6 km NE of San Juan Bautista, CA
  10. 2.8 3 km ESE of Aromas, CA
  11. 2.0 6 km SW of Gilroy, CA
  12. 2.5 10 km ENE of Morgan Hill, CA
  13. 2.4 11 km NNE of Alum Rock, CA
  14. 2.1 11 km NNE of Alum Rock, CA
  15. 2.5 14 km N of Morgan Hill, 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 5.1 on 2022-10-25 — it released about 46,000 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.