QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1md

21 km N of Brenas, Puerto Rico

· 72 km deep · released about 1,300 lb of TNT

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10 km30 km60 km120 km N Dorado Municipio 23 kmVega Baja Municipio 24 kmVega Alta Municipio 25 kmToa Baja Municipio 28 kmManatí Municipio 29 kmBarceloneta Municipio 31 kmCataño Municipio 32 kmToa Alta Municipio 35 kmMorovis Municipio 39 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
72 km below the surface
Felt
no reports yet
Nearest
Dorado Municipio, 23 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 924 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 1,300 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 6.7 260,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 12,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 8,200× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 18.6643, -66.3450. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Dorado Municipio, PR 23 km (14 mi) NNW of here earthquakes near Dorado Municipio
Vega Baja Municipio, PR 24 km (15 mi) NNE of here earthquakes near Vega Baja Municipio
Vega Alta Municipio, PR 25 km (16 mi) N of here earthquakes near Vega Alta Municipio
Toa Baja Municipio, PR 28 km (17 mi) NW of here earthquakes near Toa Baja Municipio
Manatí Municipio, PR 29 km (18 mi) NNE of here earthquakes near Manatí Municipio
Barceloneta Municipio, PR 31 km (19 mi) NE of here earthquakes near Barceloneta 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. 2.5 4 km NW of Orocovis, Puerto Rico
  2. 2.6 3 km NW of Orocovis, Puerto Rico
  3. 2.8 55 km N of Tierras Nuevas Poniente, Puerto Rico
  4. 2.7 26 km N of Hatillo, Puerto Rico
  5. 2.0 6 km W of Orocovis, Puerto Rico
  6. 2.6 29 km N of Brenas, Puerto Rico
  7. 2.8 20 km N of Tierras Nuevas Poniente, Puerto Rico
  8. 3.4 6 km NNW of Vega Baja, Puerto Rico
  9. 2.6 4 km WNW of Orocovis, Puerto Rico
  10. 3.3 6 km WSW of Estancias de Florida, Puerto Rico
  11. 3.0 37 km N of Dorado, Puerto Rico
  12. 2.8 64 km N of Tierras Nuevas Poniente, Puerto Rico
  13. 2.7 30 km N of Brenas, Puerto Rico
  14. 2.9 24 km N of Garrochales, Puerto Rico
  15. 3.0 1 km NNE of Manatí, 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 370 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.