QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

40 km N of Brenas, Puerto Rico

· 52 km deep · released about 1,400 lb of TNT

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10 km30 km60 km120 km N Vega Baja Municipio 42 kmDorado Municipio 42 kmBarceloneta Municipio 44 kmVega Alta Municipio 44 kmManatí Municipio 44 kmToa Baja Municipio 47 kmCataño Municipio 50 kmArecibo Municipio 54 kmToa Alta Municipio 54 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 3.1 (md)
Depth
52 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Vega Baja Municipio, 42 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 440 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 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 18.8325, -66.3903. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Vega Baja Municipio, PR 42 km (26 mi) N of here earthquakes near Vega Baja Municipio
Dorado Municipio, PR 42 km (26 mi) NNW of here earthquakes near Dorado Municipio
Barceloneta Municipio, PR 44 km (27 mi) NNE of here earthquakes near Barceloneta Municipio
Vega Alta Municipio, PR 44 km (28 mi) N of here earthquakes near Vega Alta Municipio
Manatí Municipio, PR 44 km (28 mi) NNE of here earthquakes near Manatí Municipio
Toa Baja Municipio, PR 47 km (29 mi) NNW of here earthquakes near Toa Baja Municipio

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

Aftershocks so far

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

  1. 3.1 47 km N of Brenas, Puerto Rico
  2. 3.5 22 km N of Brenas, Puerto Rico
  3. 3.0 38 km NNW of Brenas, Puerto Rico
  4. 3.0 9 km NNW of Sabana, Puerto Rico
  5. 3.0 46 km N of San Juan, Puerto Rico
  6. 3.4 80 km N of Arecibo, Puerto Rico
  7. 3.0 14 km N of Arecibo, Puerto Rico
  8. 3.2 12 km NNE of Carrizales, Puerto Rico
  9. 3.0 68 km N of Tierras Nuevas Poniente, Puerto Rico
  10. 2.5 11 km NNE of Tierras Nuevas Poniente, Puerto Rico
  11. 2.9 7 km NNW of Tierras Nuevas Poniente, Puerto Rico
  12. 3.0 53 km N of Tierras Nuevas Poniente, Puerto Rico
  13. 2.8 83 km N of San Juan, Puerto Rico
  14. 3.2 23 km NNW of Brenas, Puerto Rico
  15. 2.8 35 km N of Garrochales, 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 340 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.