QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

5km ESE of Interlaken, CA

· 9.9 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Cruz County 30 kmSanta Clara County 32 kmSan Benito County 64 kmSan Mateo County 81 kmAlameda County 82 kmMonterey County 84 kmMerced County 90 kmStanislaus County 92 kmContra Costa 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 1.8 (md)
Depth
9.9 km below the surface
Felt
no reports yet
Nearest
Santa Cruz County, 30 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1962 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 36.9367, -121.6807. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Cruz County, CA 30 km (19 mi) ESE of here earthquakes near Santa Cruz County
Santa Clara County, CA 32 km (20 mi) S of here earthquakes near Santa Clara County
San Benito County, CA 64 km (40 mi) NW of here earthquakes near San Benito County
San Mateo County, CA 81 km (50 mi) SE of here earthquakes near San Mateo County
Alameda County, CA 82 km (51 mi) SSE of here earthquakes near Alameda County
Monterey County, CA 84 km (52 mi) NNW of here earthquakes near Monterey County

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

Aftershocks so far

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

  1. 1.7 12km NE of Hollister, CA
  2. 2.1 11km NNW of Hollister, CA
  3. 2.1 15km N of Morgan Hill, CA
  4. 2.4 15km E of Seven Trees, CA
  5. 1.6 20km SW of Gustine, CA
  6. 1.7 13km SSW of Tres Pinos, CA
  7. 2.6 3km SW of San Juan Bautista, CA
  8. 3.0 13km SSE of Tres Pinos, CA
  9. 1.6 2km ENE of Aromas, CA
  10. 2.2 6km NNE of Tres Pinos, CA
  11. 1.6 15km SW of Tres Pinos, CA
  12. 2.3 4km NNW of Aromas, CA
  13. 3.3 4km NNW of Aromas, CA
  14. 1.9 9km E of Alum Rock, CA
  15. 1.7 5km S of San Juan Bautista, 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 23,000 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.