QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

5km SE of Aromas, CA

· 6.4 km deep · released about 5.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Cruz County 40 kmSanta Clara County 40 kmSan Benito County 54 kmMonterey County 74 kmMerced County 86 kmAlameda County 91 kmSan Mateo County 92 kmStanislaus County 94 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 1.5 (md)
Depth
6.4 km below the surface
Felt
no reports yet
Nearest
Santa Cruz County, 40 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1866 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 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 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 36.8647, -121.6010. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Cruz County, CA 40 km (25 mi) ESE of here earthquakes near Santa Cruz County
Santa Clara County, CA 40 km (25 mi) S of here earthquakes near Santa Clara County
San Benito County, CA 54 km (33 mi) WNW of here earthquakes near San Benito County
Monterey County, CA 74 km (46 mi) NNW of here earthquakes near Monterey County
Merced County, CA 86 km (54 mi) WSW of here earthquakes near Merced County
Alameda County, CA 91 km (57 mi) SSE of here earthquakes near Alameda County

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

Aftershocks so far

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

  1. 2.0 7km NNW of Pinnacles, CA
  2. 2.8 6km NW of Pinnacles, CA
  3. 2.0 14km SSE of Tres Pinos, CA
  4. 1.7 5km S of San Juan Bautista, CA
  5. 2.8 12km W of Moss Landing, CA
  6. 1.7 10km NW of Pinnacles, CA
  7. 1.6 12km W of Moss Landing, CA
  8. 2.1 8km SSW of Tres Pinos, CA
  9. 1.9 6km S of Tres Pinos, CA
  10. 1.6 7km NW of Pinnacles, CA
  11. 3.2 12km W of Moss Landing, CA
  12. 1.9 8km NW of Pinnacles, CA
  13. 1.9 13km SSW of Tres Pinos, CA
  14. 1.5 7km NNW of Pinnacles, CA
  15. 2.1 12km NNE of Hollister, 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 4.7 on 2019-10-15 — it released about 63,000 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.