QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3md

7 km NNW of Brenas, Puerto Rico

· 78 km deep · released about 1.5 tons of TNT

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10 km30 km60 km120 km N Vega Baja Municipio 9 kmVega Alta Municipio 11 kmDorado Municipio 12 kmManatí Municipio 17 kmToa Baja Municipio 19 kmToa Alta Municipio 22 kmBarceloneta Municipio 22 kmCataño Municipio 24 kmMorovis Municipio 25 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 3.3 (md)
Depth
78 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Vega Baja Municipio, 9 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1185 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,100× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,600× the energy of this one
  4. This earthquake M 3.3 about 1.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.1× more

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 18.5300, -66.3568. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Vega Baja Municipio, PR 9 km (6 mi) NNE of here earthquakes near Vega Baja Municipio
Vega Alta Municipio, PR 11 km (7 mi) NNW of here earthquakes near Vega Alta Municipio
Dorado Municipio, PR 12 km (7 mi) WNW of here earthquakes near Dorado Municipio
Manatí Municipio, PR 17 km (11 mi) ENE of here earthquakes near Manatí Municipio
Toa Baja Municipio, PR 19 km (12 mi) WNW of here earthquakes near Toa Baja Municipio
Toa Alta Municipio, PR 22 km (14 mi) NNW of here earthquakes near Toa Alta Municipio

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

Aftershocks so far

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

  1. 3.0 15 km N of Hatillo, Puerto Rico
  2. 3.1 15 km N of Carrizales, Puerto Rico
  3. 2.5 2 km SSE of Caguas, Puerto Rico
  4. 2.1 Puerto Rico region
  5. 3.4 8 km S of Orocovis, Puerto Rico
  6. 2.8 1 km SSW of Cidra, Puerto Rico
  7. 2.3 Puerto Rico region
  8. 3.2 2 km NNW of San Juan, Puerto Rico
  9. 3.3 4 km ENE of Guaynabo, Puerto Rico
  10. 2.6 8 km S of Orocovis, Puerto Rico
  11. 3.3 Puerto Rico region
  12. 2.5 13 km NNE of Carrizales, Puerto Rico
  13. 1.9 8 km ENE of Villalba, Puerto Rico
  14. 2.1 Puerto Rico region
  15. 2.8 5 km NNW of Brenas, Puerto Rico

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 4.8 on 2017-08-18 — it released about 160 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.