QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

20km NNW of San Simeon, CA

· 4.9 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Monterey County 49 kmSan Luis Obispo County 90 kmSan Benito County 92 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 1.7 (md)
Depth
4.9 km below the surface
Felt
no reports yet
Nearest
Monterey County, 49 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1613 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 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 35.8015, -121.3063. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Monterey County, CA 49 km (30 mi) S of here earthquakes near Monterey County
San Luis Obispo County, CA 90 km (56 mi) WNW of here earthquakes near San Luis Obispo County
San Benito County, CA 92 km (57 mi) SSW of here earthquakes near San Benito County

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

Aftershocks so far

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

  1. 1.6 8km NNE of San Simeon, CA
  2. 1.6 17km SSE of Lopez Point, CA
  3. 2.4 2km E of Lopez Point, CA
  4. 2.3 25km NW of San Simeon, CA
  5. 1.8 5km SSW of San Ardo, CA
  6. 1.8 13km NE of San Simeon, CA
  7. 1.6 17km NNE of San Simeon, CA
  8. 1.6 16km NNW of San Simeon, CA
  9. 1.9 9km NE of San Simeon, CA
  10. 2.3 24km SSE of Lopez Point, CA
  11. 2.6 14km NNW of Lopez Point, CA
  12. 1.8 16km WSW of San Simeon, CA
  13. 1.8 20km WSW of San Simeon, CA
  14. 1.5 12km NNE of Cambria, CA
  15. 1.5 11km W of San Ardo, 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 2021-10-25 — it released about 29,000 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.