QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

15km NW of Pinnacles, CA

· 10 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Benito County 15 kmMonterey County 45 kmSanta Clara County 76 kmMerced County 78 kmSanta Cruz County 79 kmStanislaus County 105 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
10 km below the surface
Felt
no reports yet
Nearest
San Benito County, 15 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3019 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 36.6382, -121.2522. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Benito County, CA 15 km (9 mi) WNW of here earthquakes near San Benito County
Monterey County, CA 45 km (28 mi) N of here earthquakes near Monterey County
Santa Clara County, CA 76 km (47 mi) SSE of here earthquakes near Santa Clara County
Merced County, CA 78 km (48 mi) SW of here earthquakes near Merced County
Santa Cruz County, CA 79 km (49 mi) ESE of here earthquakes near Santa Cruz County
Stanislaus County, CA 105 km (65 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

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

  1. 1.6 6km WSW of Ridgemark, CA
  2. 1.6 20km ENE of Tres Pinos, CA
  3. 2.3 4km W of Hollister, CA
  4. 1.5 3km N of Pinnacles, CA
  5. 1.6 5km NE of Pinnacles, CA
  6. 2.1 11km NE of Pinnacles, CA
  7. 2.2 12km SSE of Tres Pinos, CA
  8. 2.2 3km WSW of San Juan Bautista, CA
  9. 2.3 6km SW of Ridgemark, CA
  10. 2.0 8km ENE of Pinnacles, CA
  11. 1.8 6km SW of Ridgemark, CA
  12. 3.4 6km SW of Ridgemark, CA
  13. 1.5 23km WSW of New Idria, CA
  14. 2.3 7km SW of Ridgemark, CA
  15. 2.2 6km SW of Ridgemark, 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.