QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

33km S of Lopez Point, CA

Yes. A magnitude 2.5 earthquake was recorded 33km S of Lopez Point, CA, at 12:08 pm PDT on 10 April 2021 (19:08 UTC), 17 km deep.

· 17 km deep · released about 200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Monterey County 64 kmSan Benito County 110 kmSan Luis Obispo County 113 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 2.5 (md)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Monterey County, 64 km NNE
Nearest mapped fault
San Gregorio fault, 21 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1972 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 16 km (10 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 75,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 53,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.7× the energy of this one
  4. This earthquake M 2.5 about 200 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 6.5 10 km NE of San Simeon, California · 48 km E of this epicentre
  2. 6.2 28km NW of Cambria, CA · 28 km E of this epicentre
  3. 5.7 Southwest of Cambria, California · 46 km ESE of this epicentre
  4. 5.2 25 km NW of San Simeon, California · 28 km ENE of this epicentre
  5. 5.2 22 km NW of San Simeon, California · 28 km ENE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 35.7253, -121.6328. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Monterey County, CA 64 km (40 mi) NNE earthquakes near Monterey County
San Benito County, CA 110 km (68 mi) NNE earthquakes near San Benito County
San Luis Obispo County, CA 113 km (71 mi) ESE earthquakes near San Luis Obispo 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. 2.0 13km NNE of San Simeon, CA
  2. 2.6 23km WNW of Lopez Point, CA
  3. 1.8 10km ESE of Lopez Point, CA
  4. 1.7 18km NNW of San Simeon, CA
  5. 1.7 18km NW of San Simeon, CA
  6. 1.5 21km NNE of San Simeon, CA
  7. 2.1 18km NNW of San Simeon, CA
  8. 2.6 17km NNW of San Simeon, CA
  9. 1.7 18km NW of San Simeon, CA
  10. 1.6 20km NNW of San Simeon, CA
  11. 1.8 19km NW of San Simeon, CA
  12. 1.6 18km NNW of San Simeon, CA
  13. 2.1 18km NNW of San Simeon, CA
  14. 1.5 18km NNW of San Simeon, CA
  15. 1.7 26km NW of San Simeon, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.