QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

11km SW of Ridgemark, CA

· 6.8 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Benito County 37 kmSanta Clara County 56 kmSanta Cruz County 56 kmMonterey County 58 kmMerced County 82 kmStanislaus County 99 kmAlameda County 107 kmSan Mateo County 109 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
6.8 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
San Benito County, 37 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2757 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

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 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× 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 36.7517, -121.4642. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Benito County, CA 37 km (23 mi) WNW of here earthquakes near San Benito County
Santa Clara County, CA 56 km (35 mi) SSE of here earthquakes near Santa Clara County
Santa Cruz County, CA 56 km (35 mi) ESE of here earthquakes near Santa Cruz County
Monterey County, CA 58 km (36 mi) NNW of here earthquakes near Monterey County
Merced County, CA 82 km (51 mi) SW of here earthquakes near Merced County
Stanislaus County, CA 99 km (62 mi) SSW of here earthquakes near Stanislaus County

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

Aftershocks so far

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

  1. 2.4 3km W of San Juan Bautista, CA
  2. 1.6 10km SE of Pinnacles, CA
  3. 2.4 8km ENE of Pinnacles, CA
  4. 1.9 12km SW of Ridgemark, CA
  5. 1.5 12km SSW of Tres Pinos, CA
  6. 3.6 10km NW of Pinnacles, CA
  7. 2.3 12km S of Tres Pinos, CA
  8. 1.7 4km E of Pinnacles, CA
  9. 2.0 7km WSW of Gilroy, CA
  10. 2.0 11km ENE of San Martin, CA
  11. 2.7 11km ENE of San Martin, CA
  12. 1.6 3km W of San Juan Bautista, CA
  13. 2.8 3km W of San Juan Bautista, CA
  14. 1.8 5km N of Pinnacles, CA
  15. 2.2 16km SSE of Tres Pinos, 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 4.6 on 2017-11-13 — it released about 15,000 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.