QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

74 km N of Brenas, Puerto Rico

· 16 km deep · released about 1,500 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Dorado Municipio 74 kmVega Baja Municipio 76 kmToa Baja Municipio 77 kmVega Alta Municipio 78 kmBarceloneta Municipio 78 kmManatí Municipio 79 kmCataño Municipio 79 kmSan Juan Municipio 84 kmToa Alta Municipio 86 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
16 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 74 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1317 days ago

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

How big was it?

This earthquake released about 1,500 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 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.6× 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 19.1370, -66.3253. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 74 km (46 mi) N of here earthquakes near Dorado Municipio
Vega Baja Municipio, PR 76 km (47 mi) N of here earthquakes near Vega Baja Municipio
Toa Baja Municipio, PR 77 km (48 mi) N of here earthquakes near Toa Baja Municipio
Vega Alta Municipio, PR 78 km (48 mi) N of here earthquakes near Vega Alta Municipio
Barceloneta Municipio, PR 78 km (49 mi) NNE of here earthquakes near Barceloneta Municipio
Manatí Municipio, PR 79 km (49 mi) NNE of here earthquakes near Manatí Municipio

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

Aftershocks so far

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

  1. 3.5 Puerto Rico region
  2. 3.4 Puerto Rico region
  3. 3.1 51 km N of San Juan, Puerto Rico
  4. 3.4 81 km N of Arecibo, Puerto Rico
  5. 3.4 59 km N of Tierras Nuevas Poniente, Puerto Rico
  6. 3.4 66 km N of Tierras Nuevas Poniente, Puerto Rico
  7. 3.9 118 km N of Brenas, Puerto Rico
  8. 3.2 63 km NNE of San Juan, Puerto Rico
  9. 3.1 54 km N of Hatillo, Puerto Rico
  10. 3.4 70 km NNE of Arecibo, Puerto Rico
  11. 3.4 Puerto Rico region
  12. 3.3 49 km N of San Juan, Puerto Rico
  13. 3.2 78 km N of San Juan, Puerto Rico
  14. 3.3 Puerto Rico region
  15. 3.0 Puerto Rico region

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 310 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.